Merge branch 'master' into mod-overlay/settings-area

.config/dotnet-tools.json

@@ -27,7 +27,7 @@
       ]
     },
     "ppy.localisationanalyser.tools": {
-      "version": "2021.1210.0",
+      "version": "2022.320.0",
       "commands": [
         "localisation"
       ]

.github/ISSUE_TEMPLATE/bug-issue.yml

@@ -0,0 +1,72 @@
+name: Bug report
+description: Report a very clearly broken issue.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        # osu! bug report
+
+        Important to note that your issue may have already been reported before. Please check:
+        - Pinned issues, at the top of https://github.com/ppy/osu/issues.
+        - Current open `priority:0` issues, filterable [here](https://github.com/ppy/osu/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Apriority%3A0).
+        - And most importantly, search for your issue. If you find that it already exists, respond with a reaction or add any further information that may be helpful.
+
+  - type: dropdown
+    attributes:
+      label: Type
+      options:
+        - Crash to desktop
+        - Game behaviour
+        - Performance
+        - Cosmetic
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Bug description
+      description: How did you find the bug? Any additional details that might help?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Screenshots or videos
+      description: Add screenshots or videos that show the bug here.
+      placeholder: Drag and drop the screenshots/videos into this box.
+    validations:
+      required: false
+  - type: input
+    attributes:
+      label: Version
+      description: The version you encountered this bug on. This is shown at the bottom of the main menu and also at the end of the settings screen.
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        ## Logs
+
+        Attaching log files is required for every reported bug. See instructions below on how to find them.
+
+        If the game has not yet been closed since you found the bug:
+          1. Head on to game settings and click on "Open osu! folder"
+          2. Then open the `logs` folder located there
+
+        **Logs are reset when you reopen the game.** If the game crashed or has been closed since you found the bug, retrieve the logs using the file explorer instead.
+
+        The default places to find the logs are as follows:
+          - `%AppData%/osu/logs` *on Windows*
+          - `~/.local/share/osu/logs` *on Linux & macOS*
+          - `Android/data/sh.ppy.osulazer/files/logs` *on Android*
+          - *On iOS*, they can be obtained by connecting your device to your desktop and copying the `logs` directory from the app's own document storage using iTunes. (https://support.apple.com/en-us/HT201301#copy-to-computer)
+
+        If you have selected a custom location for the game files, you can find the `logs` folder there.
+
+        After locating the `logs` folder, select all log files inside and drag them into the "Logs" box below.
+
+  - type: textarea
+    attributes:
+      label: Logs
+      placeholder: Drag and drop the log files into this box.
+    validations:
+      required: true

.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "ms-dotnettools.csharp"
+    ]
+}

README.md

@@ -31,7 +31,7 @@ If you are looking to install or test osu! without setting up a development envi
 
 **Latest build:**
 
-| [Windows 8.1+ (x64)](https://github.com/ppy/osu/releases/latest/download/install.exe) | [macOS 10.15+](https://github.com/ppy/osu/releases/latest/download/osu.app.zip) | [Linux (x64)](https://github.com/ppy/osu/releases/latest/download/osu.AppImage) | [iOS 10+](https://osu.ppy.sh/home/testflight) | [Android 5+](https://github.com/ppy/osu/releases/latest/download/sh.ppy.osulazer.apk)
+| [Windows 8.1+ (x64)](https://github.com/ppy/osu/releases/latest/download/install.exe) | macOS 10.15+ ([Intel](https://github.com/ppy/osu/releases/latest/download/osu.app.Intel.zip), [Apple Silicon](https://github.com/ppy/osu/releases/latest/download/osu.app.Apple.Silicon.zip)) | [Linux (x64)](https://github.com/ppy/osu/releases/latest/download/osu.AppImage) | [iOS 10+](https://osu.ppy.sh/home/testflight) | [Android 5+](https://github.com/ppy/osu/releases/latest/download/sh.ppy.osulazer.apk)
 | ------------- | ------------- | ------------- | ------------- | ------------- |
 
 - The iOS testflight link may fill up (Apple has a hard limit of 10,000 users). We reset it occasionally when this happens. Please do not ask about this. Check back regularly for link resets or follow [peppy](https://twitter.com/ppy) on twitter for announcements of link resets.

osu.Android.props

@@ -51,8 +51,8 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2022.304.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2022.314.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2022.325.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2022.325.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">
     <!-- Realm needs to be directly referenced in all Xamarin projects, as it will not pull in its transitive dependencies otherwise. -->

osu.Game.Rulesets.Catch.Tests/CatchSkinColourDecodingTest.cs

@@ -30,7 +30,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         {
             public TestLegacySkin(SkinInfo skin, IResourceStore<byte[]> storage)
                 // Bypass LegacySkinResourceStore to avoid returning null for retrieving files due to bad skin info (SkinInfo.Files = null).
-                : base(skin, storage, null, "skin.ini")
+                : base(skin, null, storage)
             {
             }
         }

osu.Game.Rulesets.Osu/Mods/OsuModAimAssist.cs

@@ -24,7 +24,7 @@ namespace osu.Game.Rulesets.Osu.Mods
         public override ModType Type => ModType.Fun;
         public override string Description => "No need to chase the circle – the circle chases you!";
         public override double ScoreMultiplier => 1;
-        public override Type[] IncompatibleMods => new[] { typeof(OsuModAutopilot), typeof(OsuModWiggle), typeof(OsuModTransform), typeof(ModAutoplay) };
+        public override Type[] IncompatibleMods => new[] { typeof(OsuModAutopilot), typeof(OsuModWiggle), typeof(OsuModTransform), typeof(ModAutoplay), typeof(OsuModRelax) };
 
         private IFrameStableClock gameplayClock;
 

osu.Game.Rulesets.Osu/Mods/OsuModClassic.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Linq;
 using osu.Framework.Bindables;
 using osu.Game.Configuration;
@@ -16,6 +17,8 @@ namespace osu.Game.Rulesets.Osu.Mods
 {
     public class OsuModClassic : ModClassic, IApplicableToHitObject, IApplicableToDrawableHitObject, IApplicableToDrawableRuleset<OsuHitObject>
     {
+        public override Type[] IncompatibleMods => new[] { typeof(OsuModStrictTracking) };
+
         [SettingSource("No slider head accuracy requirement", "Scores sliders proportionally to the number of ticks hit.")]
         public Bindable<bool> NoSliderHeadAccuracy { get; } = new BindableBool(true);
 

osu.Game.Rulesets.Osu/Mods/OsuModRelax.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Osu.Mods
     public class OsuModRelax : ModRelax, IUpdatableByPlayfield, IApplicableToDrawableRuleset<OsuHitObject>, IApplicableToPlayer
     {
         public override string Description => @"You don't need to click. Give your clicking/tapping fingers a break from the heat of things.";
-        public override Type[] IncompatibleMods => base.IncompatibleMods.Append(typeof(OsuModAutopilot)).ToArray();
+        public override Type[] IncompatibleMods => base.IncompatibleMods.Concat(new[] { typeof(OsuModAutopilot), typeof(OsuModAimAssist) }).ToArray();
 
         /// <summary>
         /// How early before a hitobject's start time to trigger a hit.

osu.Game.Rulesets.Osu/Mods/OsuModStrictTracking.cs

@@ -0,0 +1,148 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using System.Threading;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Beatmaps;
+using osu.Game.Rulesets.Osu.Judgements;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Rulesets.UI;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    public class OsuModStrictTracking : Mod, IApplicableAfterBeatmapConversion, IApplicableToDrawableHitObject, IApplicableToDrawableRuleset<OsuHitObject>
+    {
+        public override string Name => @"Strict Tracking";
+        public override string Acronym => @"ST";
+        public override IconUsage? Icon => FontAwesome.Solid.PenFancy;
+        public override ModType Type => ModType.DifficultyIncrease;
+        public override string Description => @"Follow circles just got serious...";
+        public override double ScoreMultiplier => 1.0;
+        public override Type[] IncompatibleMods => new[] { typeof(ModClassic) };
+
+        public void ApplyToDrawableHitObject(DrawableHitObject drawable)
+        {
+            if (drawable is DrawableSlider slider)
+            {
+                slider.Tracking.ValueChanged += e =>
+                {
+                    if (e.NewValue || slider.Judged) return;
+
+                    var tail = slider.NestedHitObjects.OfType<StrictTrackingDrawableSliderTail>().First();
+
+                    if (!tail.Judged)
+                        tail.MissForcefully();
+                };
+            }
+        }
+
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            var osuBeatmap = (OsuBeatmap)beatmap;
+
+            if (osuBeatmap.HitObjects.Count == 0) return;
+
+            var hitObjects = osuBeatmap.HitObjects.Select(ho =>
+            {
+                if (ho is Slider slider)
+                {
+                    var newSlider = new StrictTrackingSlider(slider);
+                    return newSlider;
+                }
+
+                return ho;
+            }).ToList();
+
+            osuBeatmap.HitObjects = hitObjects;
+        }
+
+        public void ApplyToDrawableRuleset(DrawableRuleset<OsuHitObject> drawableRuleset)
+        {
+            drawableRuleset.Playfield.RegisterPool<StrictTrackingSliderTailCircle, StrictTrackingDrawableSliderTail>(10, 100);
+        }
+
+        private class StrictTrackingSliderTailCircle : SliderTailCircle
+        {
+            public StrictTrackingSliderTailCircle(Slider slider)
+                : base(slider)
+            {
+            }
+
+            public override Judgement CreateJudgement() => new OsuJudgement();
+        }
+
+        private class StrictTrackingDrawableSliderTail : DrawableSliderTail
+        {
+            public override bool DisplayResult => true;
+        }
+
+        private class StrictTrackingSlider : Slider
+        {
+            public StrictTrackingSlider(Slider original)
+            {
+                StartTime = original.StartTime;
+                Samples = original.Samples;
+                Path = original.Path;
+                NodeSamples = original.NodeSamples;
+                RepeatCount = original.RepeatCount;
+                Position = original.Position;
+                NewCombo = original.NewCombo;
+                ComboOffset = original.ComboOffset;
+                LegacyLastTickOffset = original.LegacyLastTickOffset;
+                TickDistanceMultiplier = original.TickDistanceMultiplier;
+            }
+
+            protected override void CreateNestedHitObjects(CancellationToken cancellationToken)
+            {
+                var sliderEvents = SliderEventGenerator.Generate(StartTime, SpanDuration, Velocity, TickDistance, Path.Distance, this.SpanCount(), LegacyLastTickOffset, cancellationToken);
+
+                foreach (var e in sliderEvents)
+                {
+                    switch (e.Type)
+                    {
+                        case SliderEventType.Head:
+                            AddNested(HeadCircle = new SliderHeadCircle
+                            {
+                                StartTime = e.Time,
+                                Position = Position,
+                                StackHeight = StackHeight,
+                            });
+                            break;
+
+                        case SliderEventType.LegacyLastTick:
+                            AddNested(TailCircle = new StrictTrackingSliderTailCircle(this)
+                            {
+                                RepeatIndex = e.SpanIndex,
+                                StartTime = e.Time,
+                                Position = EndPosition,
+                                StackHeight = StackHeight
+                            });
+                            break;
+
+                        case SliderEventType.Repeat:
+                            AddNested(new SliderRepeat(this)
+                            {
+                                RepeatIndex = e.SpanIndex,
+                                StartTime = StartTime + (e.SpanIndex + 1) * SpanDuration,
+                                Position = Position + Path.PositionAt(e.PathProgress),
+                                StackHeight = StackHeight,
+                                Scale = Scale,
+                            });
+                            break;
+                    }
+                }
+
+                UpdateNestedSamples();
+            }
+        }
+    }
+}

osu.Game.Rulesets.Osu/Objects/Slider.cs

@@ -154,7 +154,7 @@ namespace osu.Game.Rulesets.Osu.Objects
 
         public Slider()
         {
-            SamplesBindable.CollectionChanged += (_, __) => updateNestedSamples();
+            SamplesBindable.CollectionChanged += (_, __) => UpdateNestedSamples();
             Path.Version.ValueChanged += _ => updateNestedPositions();
         }
 
@@ -227,7 +227,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                 }
             }
 
-            updateNestedSamples();
+            UpdateNestedSamples();
         }
 
         private void updateNestedPositions()
@@ -241,7 +241,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                 TailCircle.Position = EndPosition;
         }
 
-        private void updateNestedSamples()
+        protected void UpdateNestedSamples()
         {
             var firstSample = Samples.FirstOrDefault(s => s.Name == HitSampleInfo.HIT_NORMAL)
                               ?? Samples.FirstOrDefault(); // TODO: remove this when guaranteed sort is present for samples (https://github.com/ppy/osu/issues/1933)

osu.Game.Rulesets.Osu/OsuRuleset.cs

@@ -159,6 +159,7 @@ namespace osu.Game.Rulesets.Osu
                         new MultiMod(new OsuModDoubleTime(), new OsuModNightcore()),
                         new OsuModHidden(),
                         new MultiMod(new OsuModFlashlight(), new OsuModBlinds()),
+                        new OsuModStrictTracking()
                     };
 
                 case ModType.Conversion:

osu.Game.Rulesets.Osu/Skinning/Legacy/OsuLegacySkinTransformer.cs

@@ -33,7 +33,7 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                 switch (osuComponent.Component)
                 {
                     case OsuSkinComponents.FollowPoint:
-                        return this.GetAnimation(component.LookupName, true, false, true, startAtCurrentTime: false);
+                        return this.GetAnimation(component.LookupName, true, true, true, startAtCurrentTime: false);
 
                     case OsuSkinComponents.SliderFollowCircle:
                         var followCircle = this.GetAnimation("sliderfollowcircle", true, true, true);

osu.Game.Tests/Beatmaps/Formats/LegacyBeatmapEncoderTest.cs

@@ -175,7 +175,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
         private class TestLegacySkin : LegacySkin
         {
             public TestLegacySkin(IResourceStore<byte[]> storage, string fileName)
-                : base(new SkinInfo { Name = "Test Skin", Creator = "Craftplacer" }, storage, null, fileName)
+                : base(new SkinInfo { Name = "Test Skin", Creator = "Craftplacer" }, null, storage, fileName)
             {
             }
         }

osu.Game.Tests/Beatmaps/Formats/LegacyScoreDecoderTest.cs

@@ -8,6 +8,7 @@ using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Formats;
 using osu.Game.Replays;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Catch;
@@ -64,6 +65,62 @@ namespace osu.Game.Tests.Beatmaps.Formats
             }
         }
 
+        [TestCase(3, true)]
+        [TestCase(6, false)]
+        [TestCase(LegacyBeatmapDecoder.LATEST_VERSION, false)]
+        public void TestLegacyBeatmapReplayOffsetsDecode(int beatmapVersion, bool offsetApplied)
+        {
+            const double first_frame_time = 48;
+            const double second_frame_time = 65;
+
+            var decoder = new TestLegacyScoreDecoder(beatmapVersion);
+
+            using (var resourceStream = TestResources.OpenResource("Replays/mania-replay.osr"))
+            {
+                var score = decoder.Parse(resourceStream);
+
+                Assert.That(score.Replay.Frames[0].Time, Is.EqualTo(first_frame_time + (offsetApplied ? LegacyBeatmapDecoder.EARLY_VERSION_TIMING_OFFSET : 0)));
+                Assert.That(score.Replay.Frames[1].Time, Is.EqualTo(second_frame_time + (offsetApplied ? LegacyBeatmapDecoder.EARLY_VERSION_TIMING_OFFSET : 0)));
+            }
+        }
+
+        [TestCase(3)]
+        [TestCase(6)]
+        [TestCase(LegacyBeatmapDecoder.LATEST_VERSION)]
+        public void TestLegacyBeatmapReplayOffsetsEncodeDecode(int beatmapVersion)
+        {
+            const double first_frame_time = 2000;
+            const double second_frame_time = 3000;
+
+            var ruleset = new OsuRuleset().RulesetInfo;
+            var scoreInfo = TestResources.CreateTestScoreInfo(ruleset);
+            var beatmap = new TestBeatmap(ruleset)
+            {
+                BeatmapInfo =
+                {
+                    BeatmapVersion = beatmapVersion
+                }
+            };
+
+            var score = new Score
+            {
+                ScoreInfo = scoreInfo,
+                Replay = new Replay
+                {
+                    Frames = new List<ReplayFrame>
+                    {
+                        new OsuReplayFrame(first_frame_time, OsuPlayfield.BASE_SIZE / 2, OsuAction.LeftButton),
+                        new OsuReplayFrame(second_frame_time, OsuPlayfield.BASE_SIZE / 2, OsuAction.LeftButton)
+                    }
+                }
+            };
+
+            var decodedAfterEncode = encodeThenDecode(beatmapVersion, score, beatmap);
+
+            Assert.That(decodedAfterEncode.Replay.Frames[0].Time, Is.EqualTo(first_frame_time));
+            Assert.That(decodedAfterEncode.Replay.Frames[1].Time, Is.EqualTo(second_frame_time));
+        }
+
         [Test]
         public void TestCultureInvariance()
         {
@@ -86,15 +143,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             // rather than the classic ASCII U+002D HYPHEN-MINUS.
             CultureInfo.CurrentCulture = new CultureInfo("se");
 
-            var encodeStream = new MemoryStream();
-
-            var encoder = new LegacyScoreEncoder(score, beatmap);
-            encoder.Encode(encodeStream);
-
-            var decodeStream = new MemoryStream(encodeStream.GetBuffer());
-
-            var decoder = new TestLegacyScoreDecoder();
-            var decodedAfterEncode = decoder.Parse(decodeStream);
+            var decodedAfterEncode = encodeThenDecode(LegacyBeatmapDecoder.LATEST_VERSION, score, beatmap);
 
             Assert.Multiple(() =>
             {
@@ -110,6 +159,20 @@ namespace osu.Game.Tests.Beatmaps.Formats
             });
         }
 
+        private static Score encodeThenDecode(int beatmapVersion, Score score, TestBeatmap beatmap)
+        {
+            var encodeStream = new MemoryStream();
+
+            var encoder = new LegacyScoreEncoder(score, beatmap);
+            encoder.Encode(encodeStream);
+
+            var decodeStream = new MemoryStream(encodeStream.GetBuffer());
+
+            var decoder = new TestLegacyScoreDecoder(beatmapVersion);
+            var decodedAfterEncode = decoder.Parse(decodeStream);
+            return decodedAfterEncode;
+        }
+
         [TearDown]
         public void TearDown()
         {
@@ -118,6 +181,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
 
         private class TestLegacyScoreDecoder : LegacyScoreDecoder
         {
+            private readonly int beatmapVersion;
+
             private static readonly Dictionary<int, Ruleset> rulesets = new Ruleset[]
             {
                 new OsuRuleset(),
@@ -126,6 +191,11 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 new ManiaRuleset()
             }.ToDictionary(ruleset => ((ILegacyRuleset)ruleset).LegacyID);
 
+            public TestLegacyScoreDecoder(int beatmapVersion = LegacyBeatmapDecoder.LATEST_VERSION)
+            {
+                this.beatmapVersion = beatmapVersion;
+            }
+
             protected override Ruleset GetRuleset(int rulesetId) => rulesets[rulesetId];
 
             protected override WorkingBeatmap GetBeatmap(string md5Hash) => new TestWorkingBeatmap(new Beatmap
@@ -134,7 +204,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 {
                     MD5Hash = md5Hash,
                     Ruleset = new OsuRuleset().RulesetInfo,
-                    Difficulty = new BeatmapDifficulty()
+                    Difficulty = new BeatmapDifficulty(),
+                    BeatmapVersion = beatmapVersion,
                 }
             });
         }

osu.Game.Tests/Database/BeatmapImporterTests.cs

@@ -147,7 +147,10 @@ namespace osu.Game.Tests.Database
                     Live<BeatmapSetInfo>? imported;
 
                     using (var reader = new ZipArchiveReader(TestResources.GetTestBeatmapStream()))
+                    {
                         imported = await importer.Import(reader);
+                        EnsureLoaded(realm.Realm);
+                    }
 
                     Assert.AreEqual(1, realm.Realm.All<BeatmapSetInfo>().Count());
 
@@ -510,6 +513,8 @@ namespace osu.Game.Tests.Database
                     new ImportTask(zipStream, string.Empty)
                 );
 
+                realm.Run(r => r.Refresh());
+
                 checkBeatmapSetCount(realm.Realm, 0);
                 checkBeatmapCount(realm.Realm, 0);
 
@@ -565,6 +570,8 @@ namespace osu.Game.Tests.Database
                 {
                 }
 
+                EnsureLoaded(realm.Realm);
+
                 checkBeatmapSetCount(realm.Realm, 1);
                 checkBeatmapCount(realm.Realm, 12);
 
@@ -590,6 +597,8 @@ namespace osu.Game.Tests.Database
 
                 Assert.IsTrue(imported.DeletePending);
 
+                var originalAddedDate = imported.DateAdded;
+
                 var importedSecondTime = await LoadOszIntoStore(importer, realm.Realm);
 
                 // check the newly "imported" beatmap is actually just the restored previous import. since it matches hash.
@@ -597,6 +606,7 @@ namespace osu.Game.Tests.Database
                 Assert.IsTrue(imported.Beatmaps.First().ID == importedSecondTime.Beatmaps.First().ID);
                 Assert.IsFalse(imported.DeletePending);
                 Assert.IsFalse(importedSecondTime.DeletePending);
+                Assert.That(importedSecondTime.DateAdded, Is.GreaterThan(originalAddedDate));
             });
         }
 
@@ -646,6 +656,8 @@ namespace osu.Game.Tests.Database
 
                 Assert.IsTrue(imported.DeletePending);
 
+                var originalAddedDate = imported.DateAdded;
+
                 var importedSecondTime = await LoadOszIntoStore(importer, realm.Realm);
 
                 // check the newly "imported" beatmap is actually just the restored previous import. since it matches hash.
@@ -653,6 +665,7 @@ namespace osu.Game.Tests.Database
                 Assert.IsTrue(imported.Beatmaps.First().ID == importedSecondTime.Beatmaps.First().ID);
                 Assert.IsFalse(imported.DeletePending);
                 Assert.IsFalse(importedSecondTime.DeletePending);
+                Assert.That(importedSecondTime.DateAdded, Is.GreaterThan(originalAddedDate));
             });
         }
 
@@ -720,6 +733,8 @@ namespace osu.Game.Tests.Database
 
                 var imported = importer.Import(toImport);
 
+                realm.Run(r => r.Refresh());
+
                 Assert.NotNull(imported);
                 Debug.Assert(imported != null);
 
@@ -885,6 +900,8 @@ namespace osu.Game.Tests.Database
                 string? temp = TestResources.GetTestBeatmapForImport();
                 await importer.Import(temp);
 
+                EnsureLoaded(realm.Realm);
+
                 // Update via the beatmap, not the beatmap info, to ensure correct linking
                 BeatmapSetInfo setToUpdate = realm.Realm.All<BeatmapSetInfo>().First();
 

osu.Game.Tests/Gameplay/TestSceneStoryboardSamples.cs

@@ -148,7 +148,7 @@ namespace osu.Game.Tests.Gameplay
         private class TestSkin : LegacySkin
         {
             public TestSkin(string resourceName, IStorageResourceProvider resources)
-                : base(DefaultLegacySkin.CreateInfo(), new TestResourceStore(resourceName), resources, "skin.ini")
+                : base(DefaultLegacySkin.CreateInfo(), resources, new TestResourceStore(resourceName))
             {
             }
         }

osu.Game.Tests/NonVisual/Skinning/LegacySkinTextureFallbackTest.cs

@@ -1,12 +1,21 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using NUnit.Framework;
-using osu.Framework.Graphics.OpenGL.Textures;
+using osu.Framework.Audio;
 using osu.Framework.Graphics.Textures;
+using osu.Framework.IO.Stores;
+using osu.Game.Database;
+using osu.Game.IO;
 using osu.Game.Skinning;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
 
 namespace osu.Game.Tests.NonVisual.Skinning
 {
@@ -71,7 +80,7 @@ namespace osu.Game.Tests.NonVisual.Skinning
             var texture = legacySkin.GetTexture(requestedComponent);
 
             Assert.IsNotNull(texture);
-            Assert.AreEqual(textureStore.Textures[expectedTexture], texture);
+            Assert.AreEqual(textureStore.Textures[expectedTexture].Width, texture.Width);
             Assert.AreEqual(expectedScale, texture.ScaleAdjust);
         }
 
@@ -88,23 +97,50 @@ namespace osu.Game.Tests.NonVisual.Skinning
 
         private class TestLegacySkin : LegacySkin
         {
-            public TestLegacySkin(TextureStore textureStore)
-                : base(new SkinInfo(), null, null, string.Empty)
+            public TestLegacySkin(IResourceStore<TextureUpload> textureStore)
+                : base(new SkinInfo(), new TestResourceProvider(textureStore), null, string.Empty)
             {
-                Textures = textureStore;
+            }
+
+            private class TestResourceProvider : IStorageResourceProvider
+            {
+                private readonly IResourceStore<TextureUpload> textureStore;
+
+                public TestResourceProvider(IResourceStore<TextureUpload> textureStore)
+                {
+                    this.textureStore = textureStore;
+                }
+
+                public AudioManager AudioManager => null;
+                public IResourceStore<byte[]> Files => null;
+                public IResourceStore<byte[]> Resources => null;
+                public RealmAccess RealmAccess => null;
+                public IResourceStore<TextureUpload> CreateTextureLoaderStore(IResourceStore<byte[]> underlyingStore) => textureStore;
             }
         }
 
-        private class TestTextureStore : TextureStore
+        private class TestTextureStore : IResourceStore<TextureUpload>
         {
-            public readonly Dictionary<string, Texture> Textures;
+            public readonly Dictionary<string, TextureUpload> Textures;
 
             public TestTextureStore(params string[] fileNames)
             {
-                Textures = fileNames.ToDictionary(fileName => fileName, fileName => new Texture(1, 1));
+                // use an incrementing width to allow assertion matching on correct textures as they turn from uploads into actual textures.
+                int width = 1;
+                Textures = fileNames.ToDictionary(fileName => fileName, fileName => new TextureUpload(new Image<Rgba32>(width, width++)));
             }
 
-            public override Texture Get(string name, WrapMode wrapModeS, WrapMode wrapModeT) => Textures.GetValueOrDefault(name);
+            public TextureUpload Get(string name) => Textures.GetValueOrDefault(name);
+
+            public Task<TextureUpload> GetAsync(string name, CancellationToken cancellationToken = new CancellationToken()) => Task.FromResult(Get(name));
+
+            public Stream GetStream(string name) => throw new NotImplementedException();
+
+            public IEnumerable<string> GetAvailableResources() => throw new NotImplementedException();
+
+            public void Dispose()
+            {
+            }
         }
     }
 }

osu.Game.Tests/Skins/TestSceneBeatmapSkinLookupDisables.cs

@@ -77,7 +77,7 @@ namespace osu.Game.Tests.Skins
         public class BeatmapSkinSource : LegacyBeatmapSkin
         {
             public BeatmapSkinSource()
-                : base(new TestBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo, null, null)
+                : base(new TestBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo, null)
             {
             }
 

osu.Game.Tests/Skins/TestSceneSkinConfigurationLookup.cs

@@ -202,7 +202,7 @@ namespace osu.Game.Tests.Skins
         public class BeatmapSkinSource : LegacyBeatmapSkin
         {
             public BeatmapSkinSource()
-                : base(new TestBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo, null, null)
+                : base(new TestBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo, null)
             {
             }
         }

osu.Game.Tests/Visual/Editing/TestSceneEditorBeatmapCreation.cs

@@ -13,6 +13,7 @@ using osu.Framework.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Database;
+using osu.Game.Overlays.Dialog;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Catch;
 using osu.Game.Rulesets.Osu;
@@ -23,6 +24,7 @@ using osu.Game.Screens.Edit.Setup;
 using osu.Game.Storyboards;
 using osu.Game.Tests.Resources;
 using osuTK;
+using osuTK.Input;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Zip;
 
@@ -63,13 +65,19 @@ namespace osu.Game.Tests.Visual.Editing
             EditorBeatmap editorBeatmap = null;
 
             AddStep("store editor beatmap", () => editorBeatmap = EditorBeatmap);
-            AddStep("exit without save", () =>
+
+            AddStep("exit without save", () => Editor.Exit());
+            AddStep("hold to confirm", () =>
             {
-                Editor.Exit();
-                DialogOverlay.CurrentDialog.PerformOkAction();
+                var confirmButton = DialogOverlay.CurrentDialog.ChildrenOfType<PopupDialogDangerousButton>().First();
+
+                InputManager.MoveMouseTo(confirmButton);
+                InputManager.PressButton(MouseButton.Left);
             });
 
             AddUntilStep("wait for exit", () => !Editor.IsCurrentScreen());
+            AddStep("release", () => InputManager.ReleaseButton(MouseButton.Left));
+
             AddAssert("new beatmap not persisted", () => beatmapManager.QueryBeatmapSet(s => s.ID == editorBeatmap.BeatmapInfo.BeatmapSet.ID)?.Value.DeletePending == true);
         }
 

osu.Game.Tests/Visual/Editing/TestSceneEditorSaving.cs

@@ -17,6 +17,13 @@ namespace osu.Game.Tests.Visual.Editing
 {
     public class TestSceneEditorSaving : EditorSavingTestScene
     {
+        [Test]
+        public void TestCantExitWithoutSaving()
+        {
+            AddRepeatStep("Exit", () => InputManager.Key(Key.Escape), 10);
+            AddAssert("Editor is still active screen", () => Game.ScreenStack.CurrentScreen is Editor);
+        }
+
         [Test]
         public void TestMetadata()
         {

osu.Game.Tests/Visual/Gameplay/TestSceneBeatmapSkinFallbacks.cs

@@ -18,9 +18,11 @@ using osu.Game.Rulesets;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Osu.Skinning.Legacy;
 using osu.Game.Rulesets.Scoring;
+using osu.Game.Screens.Play;
 using osu.Game.Screens.Play.HUD;
 using osu.Game.Skinning;
 using osu.Game.Storyboards;
+using osu.Game.Tests.Beatmaps;
 
 namespace osu.Game.Tests.Visual.Gameplay
 {
@@ -37,12 +39,18 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached(typeof(HealthProcessor))]
         private HealthProcessor healthProcessor = new DrainingHealthProcessor(0);
 
+        [Cached]
+        private GameplayState gameplayState = new GameplayState(new TestBeatmap(new OsuRuleset().RulesetInfo), new OsuRuleset());
+
+        [Cached]
+        private readonly GameplayClock gameplayClock = new GameplayClock(new FramedClock());
+
         protected override bool HasCustomSteps => true;
 
         [Test]
         public void TestEmptyLegacyBeatmapSkinFallsBack()
         {
-            CreateSkinTest(DefaultSkin.CreateInfo(), () => new LegacyBeatmapSkin(new BeatmapInfo(), null, null));
+            CreateSkinTest(DefaultSkin.CreateInfo(), () => new LegacyBeatmapSkin(new BeatmapInfo(), null));
             AddUntilStep("wait for hud load", () => Player.ChildrenOfType<SkinnableTargetContainer>().All(c => c.ComponentsLoaded));
             AddAssert("hud from default skin", () => AssertComponentsFromExpectedSource(SkinnableTarget.MainHUDComponents, skinManager.CurrentSkin.Value));
         }

osu.Game.Tests/Visual/Gameplay/TestSceneHUDOverlay.cs

@@ -8,12 +8,14 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
+using osu.Framework.Timing;
 using osu.Game.Configuration;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Screens.Play;
 using osu.Game.Skinning;
+using osu.Game.Tests.Beatmaps;
 using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
@@ -30,6 +32,12 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached(typeof(HealthProcessor))]
         private HealthProcessor healthProcessor = new DrainingHealthProcessor(0);
 
+        [Cached]
+        private GameplayState gameplayState = new GameplayState(new TestBeatmap(new OsuRuleset().RulesetInfo), new OsuRuleset());
+
+        [Cached]
+        private readonly GameplayClock gameplayClock = new GameplayClock(new FramedClock());
+
         // best way to check without exposing.
         private Drawable hideTarget => hudOverlay.KeyCounter;
         private FillFlowContainer<KeyCounter> keyCounterFlow => hudOverlay.KeyCounter.ChildrenOfType<FillFlowContainer<KeyCounter>>().First();

osu.Game.Tests/Visual/Gameplay/TestSceneLeadIn.cs

@@ -5,6 +5,7 @@ using System.Diagnostics;
 using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Graphics;
+using osu.Framework.Timing;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps;
 using osu.Game.Graphics.Sprites;
@@ -107,7 +108,7 @@ namespace osu.Game.Tests.Visual.Gameplay
         {
             AddStep("create player", () =>
             {
-                Beatmap.Value = CreateWorkingBeatmap(beatmap, storyboard);
+                Beatmap.Value = new ClockBackedTestWorkingBeatmap(beatmap, storyboard, new FramedClock(new ManualClock { Rate = 1 }), Audio);
                 LoadScreen(player = new LeadInPlayer());
             });
 

osu.Game.Tests/Visual/Gameplay/TestSceneSkinEditor.cs

@@ -1,14 +1,19 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Testing;
 using osu.Game.Overlays;
+using osu.Game.Overlays.Settings;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Osu;
+using osu.Game.Screens.Play.HUD.HitErrorMeters;
 using osu.Game.Skinning.Editor;
+using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
 {
@@ -29,7 +34,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             AddStep("reload skin editor", () =>
             {
                 skinEditor?.Expire();
-                Player.ScaleTo(0.8f);
+                Player.ScaleTo(0.4f);
                 LoadComponentAsync(skinEditor = new SkinEditor(Player), Add);
             });
         }
@@ -40,6 +45,36 @@ namespace osu.Game.Tests.Visual.Gameplay
             AddToggleStep("toggle editor visibility", visible => skinEditor.ToggleVisibility());
         }
 
+        [Test]
+        public void TestEditComponent()
+        {
+            BarHitErrorMeter hitErrorMeter = null;
+
+            AddStep("select bar hit error blueprint", () =>
+            {
+                var blueprint = skinEditor.ChildrenOfType<SkinBlueprint>().First(b => b.Item is BarHitErrorMeter);
+
+                hitErrorMeter = (BarHitErrorMeter)blueprint.Item;
+                skinEditor.SelectedComponents.Clear();
+                skinEditor.SelectedComponents.Add(blueprint.Item);
+            });
+
+            AddAssert("value is default", () => hitErrorMeter.JudgementLineThickness.IsDefault);
+
+            AddStep("hover first slider", () =>
+            {
+                InputManager.MoveMouseTo(
+                    skinEditor.ChildrenOfType<SkinSettingsToolbox>().First()
+                              .ChildrenOfType<SettingsSlider<float>>().First()
+                              .ChildrenOfType<SliderBar<float>>().First()
+                );
+            });
+
+            AddStep("adjust slider via keyboard", () => InputManager.Key(Key.Left));
+
+            AddAssert("value is less than default", () => hitErrorMeter.JudgementLineThickness.Value < hitErrorMeter.JudgementLineThickness.Default);
+        }
+
         protected override Ruleset CreatePlayerRuleset() => new OsuRuleset();
     }
 }

osu.Game.Tests/Visual/Gameplay/TestSceneSkinEditorMultipleSkins.cs

@@ -5,11 +5,13 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
+using osu.Framework.Timing;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Screens.Play;
 using osu.Game.Skinning.Editor;
+using osu.Game.Tests.Beatmaps;
 using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
@@ -22,6 +24,12 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached(typeof(HealthProcessor))]
         private HealthProcessor healthProcessor = new DrainingHealthProcessor(0);
 
+        [Cached]
+        private GameplayState gameplayState = new GameplayState(new TestBeatmap(new OsuRuleset().RulesetInfo), new OsuRuleset());
+
+        [Cached]
+        private readonly GameplayClock gameplayClock = new GameplayClock(new FramedClock());
+
         [SetUpSteps]
         public void SetUpSteps()
         {

osu.Game.Tests/Visual/Gameplay/TestSceneSkinnableHUDOverlay.cs

@@ -10,11 +10,13 @@ using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
+using osu.Framework.Timing;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Screens.Play;
+using osu.Game.Tests.Beatmaps;
 using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
@@ -29,6 +31,12 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached(typeof(HealthProcessor))]
         private HealthProcessor healthProcessor = new DrainingHealthProcessor(0);
 
+        [Cached]
+        private GameplayState gameplayState = new GameplayState(new TestBeatmap(new OsuRuleset().RulesetInfo), new OsuRuleset());
+
+        [Cached]
+        private readonly GameplayClock gameplayClock = new GameplayClock(new FramedClock());
+
         private IEnumerable<HUDOverlay> hudOverlays => CreatedDrawables.OfType<HUDOverlay>();
 
         // best way to check without exposing.

osu.Game.Tests/Visual/Gameplay/TestSceneSpectator.cs

@@ -70,6 +70,56 @@ namespace osu.Game.Tests.Visual.Gameplay
             });
         }
 
+        [Test]
+        public void TestSeekToGameplayStartFramesArriveAfterPlayerLoad()
+        {
+            const double gameplay_start = 10000;
+
+            loadSpectatingScreen();
+
+            start();
+
+            waitForPlayer();
+
+            sendFrames(startTime: gameplay_start);
+
+            AddAssert("time is greater than seek target", () => currentFrameStableTime > gameplay_start);
+        }
+
+        /// <summary>
+        /// Tests the same as <see cref="TestSeekToGameplayStartFramesArriveAfterPlayerLoad"/> but with the frames arriving just as <see cref="Player"/> is transitioning into existence.
+        /// </summary>
+        [Test]
+        public void TestSeekToGameplayStartFramesArriveAsPlayerLoaded()
+        {
+            const double gameplay_start = 10000;
+
+            loadSpectatingScreen();
+
+            start();
+
+            AddUntilStep("wait for player loader", () => (Stack.CurrentScreen as PlayerLoader)?.IsLoaded == true);
+
+            AddUntilStep("queue send frames on player load", () =>
+            {
+                var loadingPlayer = (Stack.CurrentScreen as PlayerLoader)?.CurrentPlayer;
+
+                if (loadingPlayer == null)
+                    return false;
+
+                loadingPlayer.OnLoadComplete += _ =>
+                {
+                    spectatorClient.SendFramesFromUser(streamingUser.Id, 10, gameplay_start);
+                };
+                return true;
+            });
+
+            waitForPlayer();
+
+            AddUntilStep("state is playing", () => spectatorClient.WatchedUserStates[streamingUser.Id].State == SpectatedUserState.Playing);
+            AddAssert("time is greater than seek target", () => currentFrameStableTime > gameplay_start);
+        }
+
         [Test]
         public void TestFrameStarvationAndResume()
         {
@@ -319,9 +369,9 @@ namespace osu.Game.Tests.Visual.Gameplay
         private void checkPaused(bool state) =>
             AddUntilStep($"game is {(state ? "paused" : "playing")}", () => player.ChildrenOfType<DrawableRuleset>().First().IsPaused.Value == state);
 
-        private void sendFrames(int count = 10)
+        private void sendFrames(int count = 10, double startTime = 0)
         {
-            AddStep("send frames", () => spectatorClient.SendFramesFromUser(streamingUser.Id, count));
+            AddStep("send frames", () => spectatorClient.SendFramesFromUser(streamingUser.Id, count, startTime));
         }
 
         private void loadSpectatingScreen()

osu.Game.Tests/Visual/Multiplayer/TestSceneMatchStartControl.cs

@@ -0,0 +1,338 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Bindables;
+using osu.Framework.Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Cursor;
+using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Platform;
+using osu.Framework.Testing;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Online.Multiplayer;
+using osu.Game.Online.Multiplayer.Countdown;
+using osu.Game.Online.Rooms;
+using osu.Game.Rulesets;
+using osu.Game.Screens.OnlinePlay.Multiplayer.Match;
+using osu.Game.Tests.Resources;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class TestSceneMatchStartControl : MultiplayerTestScene
+    {
+        private MatchStartControl control;
+        private BeatmapSetInfo importedSet;
+
+        private readonly Bindable<PlaylistItem> selectedItem = new Bindable<PlaylistItem>();
+
+        private BeatmapManager beatmaps;
+        private RulesetStore rulesets;
+
+        [BackgroundDependencyLoader]
+        private void load(GameHost host, AudioManager audio)
+        {
+            Dependencies.Cache(rulesets = new RealmRulesetStore(Realm));
+            Dependencies.Cache(beatmaps = new BeatmapManager(LocalStorage, Realm, rulesets, null, audio, Resources, host, Beatmap.Default));
+            Dependencies.Cache(Realm);
+        }
+
+        [SetUp]
+        public new void Setup() => Schedule(() =>
+        {
+            AvailabilityTracker.SelectedItem.BindTo(selectedItem);
+
+            beatmaps.Import(TestResources.GetQuickTestBeatmapForImport()).WaitSafely();
+            importedSet = beatmaps.GetAllUsableBeatmapSets().First();
+            Beatmap.Value = beatmaps.GetWorkingBeatmap(importedSet.Beatmaps.First());
+
+            selectedItem.Value = new PlaylistItem(Beatmap.Value.BeatmapInfo)
+            {
+                RulesetID = Beatmap.Value.BeatmapInfo.Ruleset.OnlineID
+            };
+
+            Child = new PopoverContainer
+            {
+                RelativeSizeAxes = Axes.Both,
+                Child = control = new MatchStartControl
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(200, 50),
+                }
+            };
+        });
+
+        [Test]
+        public void TestStartWithCountdown()
+        {
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("countdown button shown", () => this.ChildrenOfType<MultiplayerCountdownButton>().SingleOrDefault()?.IsPresent == true);
+            ClickButtonWhenEnabled<MultiplayerCountdownButton>();
+            AddStep("click the first countdown button", () =>
+            {
+                var popoverButton = this.ChildrenOfType<Popover>().Single().ChildrenOfType<OsuButton>().First();
+                InputManager.MoveMouseTo(popoverButton);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddAssert("countdown button not visible", () => !this.ChildrenOfType<MultiplayerCountdownButton>().Single().IsPresent);
+            AddStep("finish countdown", () => MultiplayerClient.SkipToEndOfCountdown());
+            AddUntilStep("match started", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.WaitingForLoad);
+        }
+
+        [Test]
+        public void TestCancelCountdown()
+        {
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("countdown button shown", () => this.ChildrenOfType<MultiplayerCountdownButton>().SingleOrDefault()?.IsPresent == true);
+            ClickButtonWhenEnabled<MultiplayerCountdownButton>();
+            AddStep("click the first countdown button", () =>
+            {
+                var popoverButton = this.ChildrenOfType<Popover>().Single().ChildrenOfType<OsuButton>().First();
+                InputManager.MoveMouseTo(popoverButton);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+
+            AddStep("finish countdown", () => MultiplayerClient.SkipToEndOfCountdown());
+            AddUntilStep("match not started", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.Ready);
+        }
+
+        [Test]
+        public void TestReadyAndUnReadyDuringCountdown()
+        {
+            AddStep("add second user as host", () =>
+            {
+                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+                MultiplayerClient.TransferHost(2);
+            });
+
+            AddStep("start with countdown", () => MultiplayerClient.SendMatchRequest(new StartMatchCountdownRequest { Duration = TimeSpan.FromMinutes(2) }).WaitSafely());
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is idle", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Idle);
+        }
+
+        [Test]
+        public void TestCountdownButtonEnablementAndVisibilityWhileSpectating()
+        {
+            AddStep("set spectating", () => MultiplayerClient.ChangeUserState(API.LocalUser.Value.OnlineID, MultiplayerUserState.Spectating));
+            AddUntilStep("local user is spectating", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.Spectating);
+
+            AddAssert("countdown button is visible", () => this.ChildrenOfType<MultiplayerCountdownButton>().Single().IsPresent);
+            AddAssert("countdown button disabled", () => !this.ChildrenOfType<MultiplayerCountdownButton>().Single().Enabled.Value);
+
+            AddStep("add second user", () => MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" }));
+            AddAssert("countdown button disabled", () => !this.ChildrenOfType<MultiplayerCountdownButton>().Single().Enabled.Value);
+
+            AddStep("set second user ready", () => MultiplayerClient.ChangeUserState(2, MultiplayerUserState.Ready));
+            AddAssert("countdown button enabled", () => this.ChildrenOfType<MultiplayerCountdownButton>().Single().Enabled.Value);
+        }
+
+        [Test]
+        public void TestSpectatingDuringCountdownWithNoReadyUsersCancelsCountdown()
+        {
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("countdown button shown", () => this.ChildrenOfType<MultiplayerCountdownButton>().SingleOrDefault()?.IsPresent == true);
+            ClickButtonWhenEnabled<MultiplayerCountdownButton>();
+            AddStep("click the first countdown button", () =>
+            {
+                var popoverButton = this.ChildrenOfType<Popover>().Single().ChildrenOfType<OsuButton>().First();
+                InputManager.MoveMouseTo(popoverButton);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddStep("set spectating", () => MultiplayerClient.ChangeUserState(API.LocalUser.Value.OnlineID, MultiplayerUserState.Spectating));
+            AddUntilStep("local user is spectating", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.Spectating);
+
+            AddStep("finish countdown", () => MultiplayerClient.SkipToEndOfCountdown());
+            AddUntilStep("match not started", () => MultiplayerClient.Room?.State == MultiplayerRoomState.Open);
+        }
+
+        [Test]
+        public void TestReadyButtonEnabledWhileSpectatingDuringCountdown()
+        {
+            AddStep("add second user", () => MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" }));
+            AddStep("set second user ready", () => MultiplayerClient.ChangeUserState(2, MultiplayerUserState.Ready));
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("countdown button shown", () => this.ChildrenOfType<MultiplayerCountdownButton>().SingleOrDefault()?.IsPresent == true);
+            ClickButtonWhenEnabled<MultiplayerCountdownButton>();
+            AddStep("click the first countdown button", () =>
+            {
+                var popoverButton = this.ChildrenOfType<Popover>().Single().ChildrenOfType<OsuButton>().First();
+                InputManager.MoveMouseTo(popoverButton);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddStep("set spectating", () => MultiplayerClient.ChangeUserState(API.LocalUser.Value.OnlineID, MultiplayerUserState.Spectating));
+            AddUntilStep("local user is spectating", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.Spectating);
+
+            AddAssert("ready button enabled", () => this.ChildrenOfType<MultiplayerReadyButton>().Single().Enabled.Value);
+        }
+
+        [Test]
+        public void TestBecomeHostDuringCountdownAndReady()
+        {
+            AddStep("add second user as host", () =>
+            {
+                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+                MultiplayerClient.TransferHost(2);
+            });
+
+            AddStep("start countdown", () => MultiplayerClient.SendMatchRequest(new StartMatchCountdownRequest { Duration = TimeSpan.FromMinutes(1) }).WaitSafely());
+            AddUntilStep("countdown started", () => MultiplayerClient.Room?.Countdown != null);
+
+            AddStep("transfer host to local user", () => MultiplayerClient.TransferHost(API.LocalUser.Value.OnlineID));
+            AddUntilStep("local user is host", () => MultiplayerClient.Room?.Host?.Equals(MultiplayerClient.LocalUser) == true);
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("local user became ready", () => MultiplayerClient.LocalUser?.State == MultiplayerUserState.Ready);
+            AddAssert("countdown still active", () => MultiplayerClient.Room?.Countdown != null);
+        }
+
+        [Test]
+        public void TestDeletedBeatmapDisableReady()
+        {
+            OsuButton readyButton = null;
+
+            AddUntilStep("ensure ready button enabled", () =>
+            {
+                readyButton = control.ChildrenOfType<OsuButton>().Single();
+                return readyButton.Enabled.Value;
+            });
+
+            AddStep("delete beatmap", () => beatmaps.Delete(importedSet));
+            AddUntilStep("ready button disabled", () => !readyButton.Enabled.Value);
+            AddStep("undelete beatmap", () => beatmaps.Undelete(importedSet));
+            AddUntilStep("ready button enabled back", () => readyButton.Enabled.Value);
+        }
+
+        [Test]
+        public void TestToggleStateWhenNotHost()
+        {
+            AddStep("add second user as host", () =>
+            {
+                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+                MultiplayerClient.TransferHost(2);
+            });
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is idle", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Idle);
+        }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void TestToggleStateWhenHost(bool allReady)
+        {
+            AddStep("setup", () =>
+            {
+                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
+
+                if (!allReady)
+                    MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+            });
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
+
+            verifyGameplayStartFlow();
+        }
+
+        [Test]
+        public void TestBecomeHostWhileReady()
+        {
+            AddStep("add host", () =>
+            {
+                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+                MultiplayerClient.TransferHost(2);
+            });
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddStep("make user host", () => MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0));
+
+            verifyGameplayStartFlow();
+        }
+
+        [Test]
+        public void TestLoseHostWhileReady()
+        {
+            AddStep("setup", () =>
+            {
+                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
+                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
+            });
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
+
+            AddStep("transfer host", () => MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[1].UserID ?? 0));
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user is idle (match not started)", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Idle);
+            AddUntilStep("ready button enabled", () => control.ChildrenOfType<OsuButton>().Single().Enabled.Value);
+        }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void TestManyUsersChangingState(bool isHost)
+        {
+            const int users = 10;
+            AddStep("setup", () =>
+            {
+                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
+                for (int i = 0; i < users; i++)
+                    MultiplayerClient.AddUser(new APIUser { Id = i, Username = "Another user" });
+            });
+
+            if (!isHost)
+                AddStep("transfer host", () => MultiplayerClient.TransferHost(2));
+
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+
+            AddRepeatStep("change user ready state", () =>
+            {
+                MultiplayerClient.ChangeUserState(RNG.Next(0, users), RNG.NextBool() ? MultiplayerUserState.Ready : MultiplayerUserState.Idle);
+            }, 20);
+
+            AddRepeatStep("ready all users", () =>
+            {
+                var nextUnready = MultiplayerClient.Room?.Users.FirstOrDefault(c => c.State == MultiplayerUserState.Idle);
+                if (nextUnready != null)
+                    MultiplayerClient.ChangeUserState(nextUnready.UserID, MultiplayerUserState.Ready);
+            }, users);
+        }
+
+        private void verifyGameplayStartFlow()
+        {
+            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
+            ClickButtonWhenEnabled<MultiplayerReadyButton>();
+            AddUntilStep("user waiting for load", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.WaitingForLoad);
+
+            AddStep("finish gameplay", () =>
+            {
+                MultiplayerClient.ChangeUserState(MultiplayerClient.Room?.Users[0].UserID ?? 0, MultiplayerUserState.Loaded);
+                MultiplayerClient.ChangeUserState(MultiplayerClient.Room?.Users[0].UserID ?? 0, MultiplayerUserState.FinishedPlay);
+            });
+
+            AddUntilStep("ready button enabled", () => control.ChildrenOfType<OsuButton>().Single().Enabled.Value);
+        }
+    }
+}

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayer.cs

@@ -41,6 +41,7 @@ using osu.Game.Screens.Ranking;
 using osu.Game.Screens.Spectate;
 using osu.Game.Tests.Resources;
 using osuTK.Input;
+using ReadyButton = osu.Game.Screens.OnlinePlay.Components.ReadyButton;
 
 namespace osu.Game.Tests.Visual.Multiplayer
 {
@@ -424,7 +425,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddUntilStep("Beatmap doesn't match current item", () => Beatmap.Value.BeatmapInfo.OnlineID != multiplayerClient.Room?.Playlist.First().BeatmapID);
 
-            AddStep("start match externally", () => multiplayerClient.StartMatch());
+            AddStep("start match externally", () => multiplayerClient.StartMatch().WaitSafely());
 
             AddUntilStep("play started", () => multiplayerComponents.CurrentScreen is Player);
 
@@ -462,7 +463,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddUntilStep("Ruleset doesn't match current item", () => Ruleset.Value.OnlineID != multiplayerClient.Room?.Playlist.First().RulesetID);
 
-            AddStep("start match externally", () => multiplayerClient.StartMatch());
+            AddStep("start match externally", () => multiplayerClient.StartMatch().WaitSafely());
 
             AddUntilStep("play started", () => multiplayerComponents.CurrentScreen is Player);
 
@@ -500,7 +501,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddAssert("Mods don't match current item", () => !SelectedMods.Value.Select(m => m.Acronym).SequenceEqual(multiplayerClient.Room.AsNonNull().Playlist.First().RequiredMods.Select(m => m.Acronym)));
 
-            AddStep("start match externally", () => multiplayerClient.StartMatch());
+            AddStep("start match externally", () => multiplayerClient.StartMatch().WaitSafely());
 
             AddUntilStep("play started", () => multiplayerComponents.CurrentScreen is Player);
 
@@ -535,7 +536,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddUntilStep("wait for spectating user state", () => multiplayerClient.LocalUser?.State == MultiplayerUserState.Spectating);
 
-            AddStep("start match externally", () => multiplayerClient.StartMatch());
+            AddStep("start match externally", () => multiplayerClient.StartMatch().WaitSafely());
 
             AddAssert("play not started", () => multiplayerComponents.IsCurrentScreen());
         }
@@ -568,7 +569,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddUntilStep("wait for spectating user state", () => multiplayerClient.LocalUser?.State == MultiplayerUserState.Spectating);
 
-            AddStep("start match externally", () => multiplayerClient.StartMatch());
+            AddStep("start match externally", () => multiplayerClient.StartMatch().WaitSafely());
 
             AddStep("restore beatmap", () =>
             {
@@ -883,7 +884,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 AddStep("start match by other user", () =>
                 {
                     multiplayerClient.ChangeUserState(1234, MultiplayerUserState.Ready);
-                    multiplayerClient.StartMatch();
+                    multiplayerClient.StartMatch().WaitSafely();
                 });
 
                 AddUntilStep("wait for loading", () => multiplayerClient.Room?.State == MultiplayerRoomState.WaitingForLoad);

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayerParticipantsList.cs

@@ -163,6 +163,25 @@ namespace osu.Game.Tests.Visual.Multiplayer
             AddUntilStep("second user crown visible", () => this.ChildrenOfType<ParticipantPanel>().ElementAt(1).ChildrenOfType<SpriteIcon>().First().Alpha == 1);
         }
 
+        [Test]
+        public void TestHostGetsPinnedToTop()
+        {
+            AddStep("add user", () => MultiplayerClient.AddUser(new APIUser
+            {
+                Id = 3,
+                Username = "Second",
+                CoverUrl = @"https://osu.ppy.sh/images/headers/profile-covers/c3.jpg",
+            }));
+
+            AddStep("make second user host", () => MultiplayerClient.TransferHost(3));
+            AddAssert("second user above first", () =>
+            {
+                var first = this.ChildrenOfType<ParticipantPanel>().ElementAt(0);
+                var second = this.ChildrenOfType<ParticipantPanel>().ElementAt(1);
+                return second.Y < first.Y;
+            });
+        }
+
         [Test]
         public void TestKickButtonOnlyPresentWhenHost()
         {
@@ -202,9 +221,11 @@ namespace osu.Game.Tests.Visual.Multiplayer
         [Test]
         public void TestManyUsers()
         {
+            const int users_count = 20;
+
             AddStep("add many users", () =>
             {
-                for (int i = 0; i < 20; i++)
+                for (int i = 0; i < users_count; i++)
                 {
                     MultiplayerClient.AddUser(new APIUser
                     {
@@ -243,6 +264,9 @@ namespace osu.Game.Tests.Visual.Multiplayer
                     }
                 }
             });
+
+            AddRepeatStep("switch hosts", () => MultiplayerClient.TransferHost(RNG.Next(0, users_count)), 10);
+            AddStep("give host back", () => MultiplayerClient.TransferHost(API.LocalUser.Value.Id));
         }
 
         [Test]

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayerPlaylist.cs

@@ -11,6 +11,8 @@ using osu.Framework.Graphics;
 using osu.Framework.Platform;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.Multiplayer;
 using osu.Game.Online.Rooms;
 using osu.Game.Rulesets;
@@ -129,6 +131,25 @@ namespace osu.Game.Tests.Visual.Multiplayer
             AddUntilStep("item 1 not in lists", () => !inHistoryList(0) && !inQueueList(0));
         }
 
+        [Test]
+        public void TestQueueTabCount()
+        {
+            assertQueueTabCount(1);
+
+            addItemStep();
+            assertQueueTabCount(2);
+
+            addItemStep();
+            assertQueueTabCount(3);
+
+            AddStep("finish current item", () => MultiplayerClient.FinishCurrentItem().WaitSafely());
+            assertQueueTabCount(2);
+
+            AddStep("leave room", () => RoomManager.PartRoom());
+            AddUntilStep("wait for room part", () => !RoomJoined);
+            assertQueueTabCount(0);
+        }
+
         [Ignore("Expired items are initially removed from the room.")]
         [Test]
         public void TestJoinRoomWithMixedItemsAddedInCorrectLists()
@@ -213,6 +234,17 @@ namespace osu.Game.Tests.Visual.Multiplayer
             });
         }
 
+        private void assertQueueTabCount(int count)
+        {
+            string queueTabText = count > 0 ? $"Queue ({count})" : "Queue";
+            AddUntilStep($"Queue tab shows \"{queueTabText}\"", () =>
+            {
+                return this.ChildrenOfType<OsuTabControl<MultiplayerPlaylistDisplayMode>.OsuTabItem>()
+                           .Single(t => t.Value == MultiplayerPlaylistDisplayMode.Queue)
+                           .ChildrenOfType<OsuSpriteText>().Single().Text == queueTabText;
+            });
+        }
+
         private void changeDisplayModeStep(MultiplayerPlaylistDisplayMode mode) => AddStep($"change list to {mode}", () => list.DisplayMode.Value = mode);
 
         private bool inQueueList(int playlistItemId)

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayerReadyButton.cs

@@ -1,223 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System;
-using System.Linq;
-using System.Threading.Tasks;
-using NUnit.Framework;
-using osu.Framework.Allocation;
-using osu.Framework.Audio;
-using osu.Framework.Bindables;
-using osu.Framework.Extensions;
-using osu.Framework.Graphics;
-using osu.Framework.Platform;
-using osu.Framework.Testing;
-using osu.Framework.Utils;
-using osu.Game.Beatmaps;
-using osu.Game.Graphics.UserInterface;
-using osu.Game.Online.API.Requests.Responses;
-using osu.Game.Online.Multiplayer;
-using osu.Game.Online.Rooms;
-using osu.Game.Rulesets;
-using osu.Game.Screens.OnlinePlay.Multiplayer.Match;
-using osu.Game.Tests.Resources;
-using osuTK;
-
-namespace osu.Game.Tests.Visual.Multiplayer
-{
-    public class TestSceneMultiplayerReadyButton : MultiplayerTestScene
-    {
-        private MultiplayerReadyButton button;
-        private BeatmapSetInfo importedSet;
-
-        private readonly Bindable<PlaylistItem> selectedItem = new Bindable<PlaylistItem>();
-
-        private BeatmapManager beatmaps;
-        private RulesetStore rulesets;
-
-        private IDisposable readyClickOperation;
-
-        [BackgroundDependencyLoader]
-        private void load(GameHost host, AudioManager audio)
-        {
-            Dependencies.Cache(rulesets = new RealmRulesetStore(Realm));
-            Dependencies.Cache(beatmaps = new BeatmapManager(LocalStorage, Realm, rulesets, null, audio, Resources, host, Beatmap.Default));
-            Dependencies.Cache(Realm);
-        }
-
-        [SetUp]
-        public new void Setup() => Schedule(() =>
-        {
-            AvailabilityTracker.SelectedItem.BindTo(selectedItem);
-
-            beatmaps.Import(TestResources.GetQuickTestBeatmapForImport()).WaitSafely();
-            importedSet = beatmaps.GetAllUsableBeatmapSets().First();
-            Beatmap.Value = beatmaps.GetWorkingBeatmap(importedSet.Beatmaps.First());
-
-            selectedItem.Value = new PlaylistItem(Beatmap.Value.BeatmapInfo)
-            {
-                RulesetID = Beatmap.Value.BeatmapInfo.Ruleset.OnlineID
-            };
-
-            if (button != null)
-                Remove(button);
-
-            Add(button = new MultiplayerReadyButton
-            {
-                Anchor = Anchor.Centre,
-                Origin = Anchor.Centre,
-                Size = new Vector2(200, 50),
-                OnReadyClick = () =>
-                {
-                    readyClickOperation = OngoingOperationTracker.BeginOperation();
-
-                    Task.Run(async () =>
-                    {
-                        if (MultiplayerClient.IsHost && MultiplayerClient.LocalUser?.State == MultiplayerUserState.Ready)
-                        {
-                            await MultiplayerClient.StartMatch();
-                            return;
-                        }
-
-                        await MultiplayerClient.ToggleReady();
-
-                        readyClickOperation.Dispose();
-                    });
-                }
-            });
-        });
-
-        [Test]
-        public void TestDeletedBeatmapDisableReady()
-        {
-            OsuButton readyButton = null;
-
-            AddUntilStep("ensure ready button enabled", () =>
-            {
-                readyButton = button.ChildrenOfType<OsuButton>().Single();
-                return readyButton.Enabled.Value;
-            });
-
-            AddStep("delete beatmap", () => beatmaps.Delete(importedSet));
-            AddUntilStep("ready button disabled", () => !readyButton.Enabled.Value);
-            AddStep("undelete beatmap", () => beatmaps.Undelete(importedSet));
-            AddUntilStep("ready button enabled back", () => readyButton.Enabled.Value);
-        }
-
-        [Test]
-        public void TestToggleStateWhenNotHost()
-        {
-            AddStep("add second user as host", () =>
-            {
-                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
-                MultiplayerClient.TransferHost(2);
-            });
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user is idle", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Idle);
-        }
-
-        [TestCase(true)]
-        [TestCase(false)]
-        public void TestToggleStateWhenHost(bool allReady)
-        {
-            AddStep("setup", () =>
-            {
-                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
-
-                if (!allReady)
-                    MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
-            });
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
-
-            verifyGameplayStartFlow();
-        }
-
-        [Test]
-        public void TestBecomeHostWhileReady()
-        {
-            AddStep("add host", () =>
-            {
-                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
-                MultiplayerClient.TransferHost(2);
-            });
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddStep("make user host", () => MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0));
-
-            verifyGameplayStartFlow();
-        }
-
-        [Test]
-        public void TestLoseHostWhileReady()
-        {
-            AddStep("setup", () =>
-            {
-                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
-                MultiplayerClient.AddUser(new APIUser { Id = 2, Username = "Another user" });
-            });
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
-
-            AddStep("transfer host", () => MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[1].UserID ?? 0));
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user is idle (match not started)", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Idle);
-            AddAssert("ready button enabled", () => button.ChildrenOfType<OsuButton>().Single().Enabled.Value);
-        }
-
-        [TestCase(true)]
-        [TestCase(false)]
-        public void TestManyUsersChangingState(bool isHost)
-        {
-            const int users = 10;
-            AddStep("setup", () =>
-            {
-                MultiplayerClient.TransferHost(MultiplayerClient.Room?.Users[0].UserID ?? 0);
-                for (int i = 0; i < users; i++)
-                    MultiplayerClient.AddUser(new APIUser { Id = i, Username = "Another user" });
-            });
-
-            if (!isHost)
-                AddStep("transfer host", () => MultiplayerClient.TransferHost(2));
-
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-
-            AddRepeatStep("change user ready state", () =>
-            {
-                MultiplayerClient.ChangeUserState(RNG.Next(0, users), RNG.NextBool() ? MultiplayerUserState.Ready : MultiplayerUserState.Idle);
-            }, 20);
-
-            AddRepeatStep("ready all users", () =>
-            {
-                var nextUnready = MultiplayerClient.Room?.Users.FirstOrDefault(c => c.State == MultiplayerUserState.Idle);
-                if (nextUnready != null)
-                    MultiplayerClient.ChangeUserState(nextUnready.UserID, MultiplayerUserState.Ready);
-            }, users);
-        }
-
-        private void verifyGameplayStartFlow()
-        {
-            AddUntilStep("user is ready", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.Ready);
-            ClickButtonWhenEnabled<MultiplayerReadyButton>();
-            AddUntilStep("user waiting for load", () => MultiplayerClient.Room?.Users[0].State == MultiplayerUserState.WaitingForLoad);
-
-            AddAssert("ready button disabled", () => !button.ChildrenOfType<OsuButton>().Single().Enabled.Value);
-            AddStep("transitioned to gameplay", () => readyClickOperation.Dispose());
-
-            AddStep("finish gameplay", () =>
-            {
-                MultiplayerClient.ChangeUserState(MultiplayerClient.Room?.Users[0].UserID ?? 0, MultiplayerUserState.Loaded);
-                MultiplayerClient.ChangeUserState(MultiplayerClient.Room?.Users[0].UserID ?? 0, MultiplayerUserState.FinishedPlay);
-            });
-
-            AddUntilStep("ready button enabled", () => button.ChildrenOfType<OsuButton>().Single().Enabled.Value);
-        }
-    }
-}

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayerSpectateButton.cs

@@ -1,9 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using System.Linq;
-using System.Threading.Tasks;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Audio;
@@ -11,6 +9,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Cursor;
 using osu.Framework.Platform;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
@@ -28,7 +27,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
     public class TestSceneMultiplayerSpectateButton : MultiplayerTestScene
     {
         private MultiplayerSpectateButton spectateButton;
-        private MultiplayerReadyButton readyButton;
+        private MatchStartControl startControl;
 
         private readonly Bindable<PlaylistItem> selectedItem = new Bindable<PlaylistItem>();
 
@@ -36,8 +35,6 @@ namespace osu.Game.Tests.Visual.Multiplayer
         private BeatmapManager beatmaps;
         private RulesetStore rulesets;
 
-        private IDisposable readyClickOperation;
-
         [BackgroundDependencyLoader]
         private void load(GameHost host, AudioManager audio)
         {
@@ -60,49 +57,26 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 RulesetID = Beatmap.Value.BeatmapInfo.Ruleset.OnlineID,
             };
 
-            Child = new FillFlowContainer
+            Child = new PopoverContainer
             {
-                AutoSizeAxes = Axes.Both,
-                Direction = FillDirection.Vertical,
-                Children = new Drawable[]
+                RelativeSizeAxes = Axes.Both,
+                Child = new FillFlowContainer
                 {
-                    spectateButton = new MultiplayerSpectateButton
+                    AutoSizeAxes = Axes.Both,
+                    Direction = FillDirection.Vertical,
+                    Children = new Drawable[]
                     {
-                        Anchor = Anchor.Centre,
-                        Origin = Anchor.Centre,
-                        Size = new Vector2(200, 50),
-                        OnSpectateClick = () =>
+                        spectateButton = new MultiplayerSpectateButton
                         {
-                            readyClickOperation = OngoingOperationTracker.BeginOperation();
-
-                            Task.Run(async () =>
-                            {
-                                await MultiplayerClient.ToggleSpectate();
-                                readyClickOperation.Dispose();
-                            });
-                        }
-                    },
-                    readyButton = new MultiplayerReadyButton
-                    {
-                        Anchor = Anchor.Centre,
-                        Origin = Anchor.Centre,
-                        Size = new Vector2(200, 50),
-                        OnReadyClick = () =>
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Size = new Vector2(200, 50),
+                        },
+                        startControl = new MatchStartControl
                         {
-                            readyClickOperation = OngoingOperationTracker.BeginOperation();
-
-                            Task.Run(async () =>
-                            {
-                                if (MultiplayerClient.IsHost && MultiplayerClient.LocalUser?.State == MultiplayerUserState.Ready)
-                                {
-                                    await MultiplayerClient.StartMatch();
-                                    return;
-                                }
-
-                                await MultiplayerClient.ToggleReady();
-
-                                readyClickOperation.Dispose();
-                            });
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Size = new Vector2(200, 50),
                         }
                     }
                 }
@@ -172,6 +146,6 @@ namespace osu.Game.Tests.Visual.Multiplayer
             => AddUntilStep($"spectate button {(shouldBeEnabled ? "is" : "is not")} enabled", () => spectateButton.ChildrenOfType<OsuButton>().Single().Enabled.Value == shouldBeEnabled);
 
         private void assertReadyButtonEnablement(bool shouldBeEnabled)
-            => AddUntilStep($"ready button {(shouldBeEnabled ? "is" : "is not")} enabled", () => readyButton.ChildrenOfType<OsuButton>().Single().Enabled.Value == shouldBeEnabled);
+            => AddUntilStep($"ready button {(shouldBeEnabled ? "is" : "is not")} enabled", () => startControl.ChildrenOfType<MultiplayerReadyButton>().Single().Enabled.Value == shouldBeEnabled);
     }
 }

osu.Game.Tests/Visual/Navigation/TestSceneScreenNavigation.cs

@@ -7,6 +7,7 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Screens;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
@@ -14,6 +15,7 @@ using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.Leaderboards;
 using osu.Game.Overlays;
 using osu.Game.Overlays.Mods;
+using osu.Game.Overlays.Settings;
 using osu.Game.Overlays.Toolbar;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Mods;
@@ -21,10 +23,12 @@ using osu.Game.Scoring;
 using osu.Game.Screens.Menu;
 using osu.Game.Screens.OnlinePlay.Lounge;
 using osu.Game.Screens.Play;
+using osu.Game.Screens.Play.HUD.HitErrorMeters;
 using osu.Game.Screens.Ranking;
 using osu.Game.Screens.Select;
 using osu.Game.Screens.Select.Leaderboards;
 using osu.Game.Screens.Select.Options;
+using osu.Game.Skinning.Editor;
 using osu.Game.Tests.Beatmaps.IO;
 using osuTK;
 using osuTK.Input;
@@ -66,6 +70,73 @@ namespace osu.Game.Tests.Visual.Navigation
             AddAssert("Overlay was shown", () => songSelect.ModSelectOverlay.State.Value == Visibility.Visible);
         }
 
+        [Test]
+        public void TestEditComponentDuringGameplay()
+        {
+            Screens.Select.SongSelect songSelect = null;
+            PushAndConfirm(() => songSelect = new TestPlaySongSelect());
+            AddUntilStep("wait for song select", () => songSelect.BeatmapSetsLoaded);
+
+            AddStep("import beatmap", () => BeatmapImportHelper.LoadQuickOszIntoOsu(Game).WaitSafely());
+
+            AddUntilStep("wait for selected", () => !Game.Beatmap.IsDefault);
+
+            SkinEditor skinEditor = null;
+
+            AddStep("open skin editor", () =>
+            {
+                InputManager.PressKey(Key.ControlLeft);
+                InputManager.PressKey(Key.ShiftLeft);
+                InputManager.Key(Key.S);
+                InputManager.ReleaseKey(Key.ControlLeft);
+                InputManager.ReleaseKey(Key.ShiftLeft);
+            });
+
+            AddUntilStep("get skin editor", () => (skinEditor = Game.ChildrenOfType<SkinEditor>().FirstOrDefault()) != null);
+
+            AddStep("Click gameplay scene button", () =>
+            {
+                skinEditor.ChildrenOfType<SkinEditorSceneLibrary.SceneButton>().First(b => b.Text == "Gameplay").TriggerClick();
+            });
+
+            AddUntilStep("wait for player", () =>
+            {
+                // dismiss any notifications that may appear (ie. muted notification).
+                clickMouseInCentre();
+                return Game.ScreenStack.CurrentScreen is Player;
+            });
+
+            BarHitErrorMeter hitErrorMeter = null;
+
+            AddUntilStep("select bar hit error blueprint", () =>
+            {
+                var blueprint = skinEditor.ChildrenOfType<SkinBlueprint>().FirstOrDefault(b => b.Item is BarHitErrorMeter);
+
+                if (blueprint == null)
+                    return false;
+
+                hitErrorMeter = (BarHitErrorMeter)blueprint.Item;
+                skinEditor.SelectedComponents.Clear();
+                skinEditor.SelectedComponents.Add(blueprint.Item);
+                return true;
+            });
+
+            AddAssert("value is default", () => hitErrorMeter.JudgementLineThickness.IsDefault);
+
+            AddStep("hover first slider", () =>
+            {
+                InputManager.MoveMouseTo(
+                    skinEditor.ChildrenOfType<SkinSettingsToolbox>().First()
+                              .ChildrenOfType<SettingsSlider<float>>().First()
+                              .ChildrenOfType<SliderBar<float>>().First()
+                );
+            });
+
+            AddStep("adjust slider via keyboard", () => InputManager.Key(Key.Left));
+
+            AddAssert("value is less than default", () => hitErrorMeter.JudgementLineThickness.Value < hitErrorMeter.JudgementLineThickness.Default);
+        }
+
         [Test]
         public void TestRetryCountIncrements()
         {
@@ -120,7 +191,8 @@ namespace osu.Game.Tests.Visual.Navigation
 
             AddStep("press back button", () => Game.ChildrenOfType<BackButton>().First().Action());
 
-            AddStep("show local scores", () => Game.ChildrenOfType<BeatmapDetailAreaTabControl>().First().Current.Value = new BeatmapDetailAreaLeaderboardTabItem<BeatmapLeaderboardScope>(BeatmapLeaderboardScope.Local));
+            AddStep("show local scores",
+                () => Game.ChildrenOfType<BeatmapDetailAreaTabControl>().First().Current.Value = new BeatmapDetailAreaLeaderboardTabItem<BeatmapLeaderboardScope>(BeatmapLeaderboardScope.Local));
 
             AddUntilStep("wait for score displayed", () => (scorePanel = Game.ChildrenOfType<LeaderboardScore>().FirstOrDefault(s => s.Score.Equals(score))) != null);
 
@@ -152,7 +224,8 @@ namespace osu.Game.Tests.Visual.Navigation
 
             AddStep("press back button", () => Game.ChildrenOfType<BackButton>().First().Action());
 
-            AddStep("show local scores", () => Game.ChildrenOfType<BeatmapDetailAreaTabControl>().First().Current.Value = new BeatmapDetailAreaLeaderboardTabItem<BeatmapLeaderboardScope>(BeatmapLeaderboardScope.Local));
+            AddStep("show local scores",
+                () => Game.ChildrenOfType<BeatmapDetailAreaTabControl>().First().Current.Value = new BeatmapDetailAreaLeaderboardTabItem<BeatmapLeaderboardScope>(BeatmapLeaderboardScope.Local));
 
             AddUntilStep("wait for score displayed", () => (scorePanel = Game.ChildrenOfType<LeaderboardScore>().FirstOrDefault(s => s.Score.Equals(score))) != null);
 
@@ -262,6 +335,20 @@ namespace osu.Game.Tests.Visual.Navigation
             exitViaBackButtonAndConfirm();
         }
 
+        [Test]
+        public void TestModsResetOnEnteringMultiplayer()
+        {
+            var osuAutomationMod = new OsuModAutoplay();
+
+            AddStep("Enable autoplay", () => { Game.SelectedMods.Value = new[] { osuAutomationMod }; });
+
+            PushAndConfirm(() => new Screens.OnlinePlay.Multiplayer.Multiplayer());
+            AddUntilStep("Mods are removed", () => Game.SelectedMods.Value.Count == 0);
+
+            AddStep("Return to menu", () => Game.ScreenStack.CurrentScreen.Exit());
+            AddUntilStep("Mods are restored", () => Game.SelectedMods.Value.Contains(osuAutomationMod));
+        }
+
         [Test]
         public void TestExitMultiWithEscape()
         {

osu.Game.Tests/Visual/Online/TestSceneChannelListItem.cs

@@ -0,0 +1,163 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Online.Chat;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Chat.ChannelList;
+using osuTK;
+
+namespace osu.Game.Tests.Visual.Online
+{
+    [TestFixture]
+    public class TestSceneChannelListItem : OsuTestScene
+    {
+        [Cached]
+        private readonly OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Pink);
+
+        [Cached]
+        private readonly Bindable<Channel> selected = new Bindable<Channel>();
+
+        private static readonly List<Channel> channels = new List<Channel>
+        {
+            createPublicChannel("#public-channel"),
+            createPublicChannel("#public-channel-long-name"),
+            createPrivateChannel("test user", 2),
+            createPrivateChannel("test user long name", 3),
+        };
+
+        private readonly Dictionary<Channel, ChannelListItem> channelMap = new Dictionary<Channel, ChannelListItem>();
+
+        private FillFlowContainer flow;
+        private OsuSpriteText selectedText;
+        private OsuSpriteText leaveText;
+
+        [SetUp]
+        public void SetUp()
+        {
+            Schedule(() =>
+            {
+                foreach (var item in channelMap.Values)
+                    item.Expire();
+
+                channelMap.Clear();
+
+                Child = new FillFlowContainer
+                {
+                    Direction = FillDirection.Vertical,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    AutoSizeAxes = Axes.Both,
+                    Spacing = new Vector2(10),
+                    Children = new Drawable[]
+                    {
+                        selectedText = new OsuSpriteText
+                        {
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                        },
+                        leaveText = new OsuSpriteText
+                        {
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                            Height = 16,
+                            AlwaysPresent = true,
+                        },
+                        new Container
+                        {
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                            AutoSizeAxes = Axes.Y,
+                            Width = 190,
+                            Children = new Drawable[]
+                            {
+                                new Box
+                                {
+                                    RelativeSizeAxes = Axes.Both,
+                                    Colour = colourProvider.Background6,
+                                },
+                                flow = new FillFlowContainer
+                                {
+                                    Direction = FillDirection.Vertical,
+                                    RelativeSizeAxes = Axes.X,
+                                    AutoSizeAxes = Axes.Y,
+                                },
+                            },
+                        },
+                    },
+                };
+
+                selected.BindValueChanged(change =>
+                {
+                    selectedText.Text = $"Selected Channel: {change.NewValue?.Name ?? "[null]"}";
+                }, true);
+
+                foreach (var channel in channels)
+                {
+                    var item = new ChannelListItem(channel);
+                    flow.Add(item);
+                    channelMap.Add(channel, item);
+                    item.OnRequestSelect += c => selected.Value = c;
+                    item.OnRequestLeave += leaveChannel;
+                }
+            });
+        }
+
+        [Test]
+        public void TestVisual()
+        {
+            AddStep("Select second item", () => selected.Value = channels.Skip(1).First());
+
+            AddStep("Unread Selected", () =>
+            {
+                if (selected.Value != null)
+                    channelMap[selected.Value].Unread.Value = true;
+            });
+
+            AddStep("Read Selected", () =>
+            {
+                if (selected.Value != null)
+                    channelMap[selected.Value].Unread.Value = false;
+            });
+
+            AddStep("Add Mention Selected", () =>
+            {
+                if (selected.Value != null)
+                    channelMap[selected.Value].Mentions.Value++;
+            });
+
+            AddStep("Add 98 Mentions Selected", () =>
+            {
+                if (selected.Value != null)
+                    channelMap[selected.Value].Mentions.Value += 98;
+            });
+
+            AddStep("Clear Mentions Selected", () =>
+            {
+                if (selected.Value != null)
+                    channelMap[selected.Value].Mentions.Value = 0;
+            });
+        }
+
+        private void leaveChannel(Channel channel)
+        {
+            leaveText.Text = $"OnRequestLeave: {channel.Name}";
+            leaveText.FadeOutFromOne(1000, Easing.InQuint);
+        }
+
+        private static Channel createPublicChannel(string name) =>
+            new Channel { Name = name, Type = ChannelType.Public, Id = 1234 };
+
+        private static Channel createPrivateChannel(string username, int id)
+            => new Channel(new APIUser { Id = id, Username = username });
+    }
+}

osu.Game.Tests/Visual/Online/TestSceneChatOverlay.cs

@@ -122,6 +122,8 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestHideOverlay()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
+
             AddAssert("Chat overlay is visible", () => chatOverlay.State.Value == Visibility.Visible);
             AddAssert("Selector is visible", () => chatOverlay.SelectionOverlayState == Visibility.Visible);
 
@@ -134,6 +136,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestChannelSelection()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddAssert("Selector is visible", () => chatOverlay.SelectionOverlayState == Visibility.Visible);
             AddStep("Setup get message response", () => onGetMessages = channel =>
             {
@@ -169,6 +172,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestSearchInSelector()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Search for 'no. 2'", () => chatOverlay.ChildrenOfType<SearchTextBox>().First().Text = "no. 2");
             AddUntilStep("Only channel 2 visible", () =>
             {
@@ -180,6 +184,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestChannelShortcutKeys()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join channels", () => channels.ForEach(channel => channelManager.JoinChannel(channel)));
             AddStep("Close channel selector", () => InputManager.Key(Key.Escape));
             AddUntilStep("Wait for close", () => chatOverlay.SelectionOverlayState == Visibility.Hidden);
@@ -199,6 +204,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestCloseChannelBehaviour()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddUntilStep("Join until dropdown has channels", () =>
             {
                 if (visibleChannels.Count() < joinedChannels.Count())
@@ -269,6 +275,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestChannelCloseButton()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join 2 channels", () =>
             {
                 channelManager.JoinChannel(channel1);
@@ -289,6 +296,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestCloseTabShortcut()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join 2 channels", () =>
             {
                 channelManager.JoinChannel(channel1);
@@ -314,6 +322,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestNewTabShortcut()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join 2 channels", () =>
             {
                 channelManager.JoinChannel(channel1);
@@ -330,6 +339,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestRestoreTabShortcut()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join 3 channels", () =>
             {
                 channelManager.JoinChannel(channel1);
@@ -375,6 +385,7 @@ namespace osu.Game.Tests.Visual.Online
         [Test]
         public void TestChatCommand()
         {
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join channel 1", () => channelManager.JoinChannel(channel1));
             AddStep("Select channel 1", () => clickDrawable(chatOverlay.TabMap[channel1]));
 
@@ -398,6 +409,8 @@ namespace osu.Game.Tests.Visual.Online
         {
             Channel multiplayerChannel = null;
 
+            AddStep("open chat overlay", () => chatOverlay.Show());
+
             AddStep("join multiplayer channel", () => channelManager.JoinChannel(multiplayerChannel = new Channel(new APIUser())
             {
                 Name = "#mp_1",
@@ -417,6 +430,7 @@ namespace osu.Game.Tests.Visual.Online
         {
             Message message = null;
 
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join channel 1", () => channelManager.JoinChannel(channel1));
             AddStep("Select channel 1", () => clickDrawable(chatOverlay.TabMap[channel1]));
 
@@ -443,6 +457,7 @@ namespace osu.Game.Tests.Visual.Online
         {
             Message message = null;
 
+            AddStep("Open chat overlay", () => chatOverlay.Show());
             AddStep("Join channel 1", () => channelManager.JoinChannel(channel1));
             AddStep("Select channel 1", () => clickDrawable(chatOverlay.TabMap[channel1]));
 
@@ -471,6 +486,8 @@ namespace osu.Game.Tests.Visual.Online
         {
             Message message = null;
 
+            AddStep("Open chat overlay", () => chatOverlay.Show());
+
             AddStep("Join channel 1", () => channelManager.JoinChannel(channel1));
             AddStep("Select channel 1", () => clickDrawable(chatOverlay.TabMap[channel1]));
 
@@ -496,14 +513,11 @@ namespace osu.Game.Tests.Visual.Online
         }
 
         [Test]
-        public void TestHighlightWhileChatHidden()
+        public void TestHighlightWhileChatNeverOpen()
         {
             Message message = null;
 
-            AddStep("hide chat", () => chatOverlay.Hide());
-
             AddStep("Join channel 1", () => channelManager.JoinChannel(channel1));
-            AddStep("Select channel 1", () => clickDrawable(chatOverlay.TabMap[channel1]));
 
             AddStep("Send message in channel 1", () =>
             {
@@ -520,7 +534,7 @@ namespace osu.Game.Tests.Visual.Online
                 });
             });
 
-            AddStep("Highlight message and show chat", () =>
+            AddStep("Highlight message and open chat", () =>
             {
                 chatOverlay.HighlightMessage(message, channel1);
                 chatOverlay.Show();
@@ -571,8 +585,6 @@ namespace osu.Game.Tests.Visual.Online
                     ChannelManager,
                     ChatOverlay = new TestChatOverlay { RelativeSizeAxes = Axes.Both, },
                 };
-
-                ChatOverlay.Show();
             }
         }
 

osu.Game.Tests/Visual/UserInterface/TestScenePopupDialog.cs

@@ -40,6 +40,10 @@ namespace osu.Game.Tests.Visual.UserInterface
                     {
                         Text = @"You're a fake!",
                     },
+                    new PopupDialogDangerousButton
+                    {
+                        Text = @"Careful with this one..",
+                    },
                 };
             }
         }

osu.Game.Tournament/Screens/Setup/TournamentSwitcher.cs

@@ -26,7 +26,7 @@ namespace osu.Game.Tournament.Screens.Setup
             dropdown.Current.BindValueChanged(v => Button.Enabled.Value = v.NewValue != startupTournament, true);
 
             Action = () => game.GracefullyExit();
-            folderButton.Action = storage.PresentExternally;
+            folderButton.Action = () => storage.PresentExternally();
 
             ButtonText = "Close osu!";
         }

osu.Game/Beatmaps/BeatmapInfo.cs

@@ -9,6 +9,7 @@ using osu.Framework.Testing;
 using osu.Game.Database;
 using osu.Game.Models;
 using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Overlays.BeatmapSet.Scores;
 using osu.Game.Rulesets;
 using osu.Game.Scoring;
 using Realms;
@@ -169,7 +170,12 @@ namespace osu.Game.Beatmaps
         [Ignored]
         public APIBeatmap? OnlineInfo { get; set; }
 
+        /// <summary>
+        /// The maximum achievable combo on this beatmap, populated for online info purposes only.
+        /// Todo: This should never be used nor exist, but is still relied on in <see cref="ScoresContainer.Scores"/> since <see cref="IBeatmapInfo"/> can't be used yet. For now this is obsoleted until it is removed.
+        /// </summary>
         [Ignored]
+        [Obsolete("Use ScoreManager.GetMaximumAchievableComboAsync instead.")]
         public int? MaxCombo { get; set; }
 
         [Ignored]

osu.Game/Beatmaps/EFBeatmapInfo.cs

@@ -53,9 +53,6 @@ namespace osu.Game.Beatmaps
         [NotMapped]
         public APIBeatmap OnlineInfo { get; set; }
 
-        [NotMapped]
-        public int? MaxCombo { get; set; }
-
         /// <summary>
         /// The playable length in milliseconds of this beatmap.
         /// </summary>

osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

@@ -19,6 +19,11 @@ namespace osu.Game.Beatmaps.Formats
 {
     public class LegacyBeatmapDecoder : LegacyDecoder<Beatmap>
     {
+        /// <summary>
+        /// An offset which needs to be applied to old beatmaps (v4 and lower) to correct timing changes that were applied at a game client level.
+        /// </summary>
+        public const int EARLY_VERSION_TIMING_OFFSET = 24;
+
         internal static RulesetStore RulesetStore;
 
         private Beatmap beatmap;
@@ -50,8 +55,7 @@ namespace osu.Game.Beatmaps.Formats
                 RulesetStore = new AssemblyRulesetStore();
             }
 
-            // BeatmapVersion 4 and lower had an incorrect offset (stable has this set as 24ms off)
-            offset = FormatVersion < 5 ? 24 : 0;
+            offset = FormatVersion < 5 ? EARLY_VERSION_TIMING_OFFSET : 0;
         }
 
         protected override Beatmap CreateTemplateObject()

osu.Game/Beatmaps/WorkingBeatmapCache.cs

@@ -225,7 +225,7 @@ namespace osu.Game.Beatmaps
             {
                 try
                 {
-                    return new LegacyBeatmapSkin(BeatmapInfo, resources.Files, resources);
+                    return new LegacyBeatmapSkin(BeatmapInfo, resources);
                 }
                 catch (Exception e)
                 {

osu.Game/Database/EFToRealmMigrator.cs

@@ -295,7 +295,6 @@ namespace osu.Game.Database
                                 TimelineZoom = beatmap.TimelineZoom,
                                 Countdown = beatmap.Countdown,
                                 CountdownOffset = beatmap.CountdownOffset,
-                                MaxCombo = beatmap.MaxCombo,
                                 Bookmarks = beatmap.Bookmarks,
                                 BeatmapSet = realmBeatmapSet,
                             };

osu.Game/Database/RealmAccess.cs

@@ -1,6 +1,8 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
@@ -17,6 +19,7 @@ using osu.Framework.Input.Bindings;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Framework.Statistics;
+using osu.Framework.Threading;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
 using osu.Game.Input.Bindings;
@@ -28,8 +31,6 @@ using osu.Game.Stores;
 using Realms;
 using Realms.Exceptions;
 
-#nullable enable
-
 namespace osu.Game.Database
 {
     /// <summary>
@@ -46,6 +47,8 @@ namespace osu.Game.Database
 
         private readonly IDatabaseContextFactory? efContextFactory;
 
+        private readonly SynchronizationContext? updateThreadSyncContext;
+
         /// <summary>
         /// Version history:
         /// 6    ~2021-10-18   First tracked version.
@@ -143,12 +146,15 @@ namespace osu.Game.Database
         /// </summary>
         /// <param name="storage">The game storage which will be used to create the realm backing file.</param>
         /// <param name="filename">The filename to use for the realm backing file. A ".realm" extension will be added automatically if not specified.</param>
+        /// <param name="updateThread">The game update thread, used to post realm operations into a thread-safe context.</param>
         /// <param name="efContextFactory">An EF factory used only for migration purposes.</param>
-        public RealmAccess(Storage storage, string filename, IDatabaseContextFactory? efContextFactory = null)
+        public RealmAccess(Storage storage, string filename, GameThread? updateThread = null, IDatabaseContextFactory? efContextFactory = null)
         {
             this.storage = storage;
             this.efContextFactory = efContextFactory;
 
+            updateThreadSyncContext = updateThread?.SynchronizationContext ?? SynchronizationContext.Current;
+
             Filename = filename;
 
             if (!Filename.EndsWith(realm_extension, StringComparison.Ordinal))
@@ -379,9 +385,6 @@ namespace osu.Game.Database
         public IDisposable RegisterForNotifications<T>(Func<Realm, IQueryable<T>> query, NotificationCallbackDelegate<T> callback)
             where T : RealmObjectBase
         {
-            if (!ThreadSafety.IsUpdateThread)
-                throw new InvalidOperationException(@$"{nameof(RegisterForNotifications)} must be called from the update thread.");
-
             lock (realmLock)
             {
                 Func<Realm, IDisposable?> action = realm => query(realm).QueryAsyncWithNotifications(callback);
@@ -459,23 +462,24 @@ namespace osu.Game.Database
         /// <returns>An <see cref="IDisposable"/> which should be disposed to unsubscribe any inner subscription.</returns>
         public IDisposable RegisterCustomSubscription(Func<Realm, IDisposable?> action)
         {
-            if (!ThreadSafety.IsUpdateThread)
-                throw new InvalidOperationException(@$"{nameof(RegisterForNotifications)} must be called from the update thread.");
-
-            var syncContext = SynchronizationContext.Current;
+            if (updateThreadSyncContext == null)
+                throw new InvalidOperationException("Attempted to register a realm subscription before update thread registration.");
 
             total_subscriptions.Value++;
 
-            registerSubscription(action);
+            if (ThreadSafety.IsUpdateThread)
+                updateThreadSyncContext.Send(_ => registerSubscription(action), null);
+            else
+                updateThreadSyncContext.Post(_ => registerSubscription(action), null);
 
             // This token is returned to the consumer.
             // When disposed, it will cause the registration to be permanently ceased (unsubscribed with realm and unregistered by this class).
             return new InvokeOnDisposal(() =>
             {
                 if (ThreadSafety.IsUpdateThread)
-                    syncContext.Send(_ => unsubscribe(), null);
+                    updateThreadSyncContext.Send(_ => unsubscribe(), null);
                 else
-                    syncContext.Post(_ => unsubscribe(), null);
+                    updateThreadSyncContext.Post(_ => unsubscribe(), null);
 
                 void unsubscribe()
                 {

osu.Game/Graphics/Containers/HoldToConfirmContainer.cs

@@ -28,6 +28,14 @@ namespace osu.Game.Graphics.Containers
         /// </summary>
         protected virtual bool AllowMultipleFires => false;
 
+        /// <summary>
+        /// Specify a custom activation delay, overriding the game-wide user setting.
+        /// </summary>
+        /// <remarks>
+        /// This should be used in special cases where we want to be extra sure the user knows what they are doing. An example is when changes would be lost.
+        /// </remarks>
+        protected virtual double? HoldActivationDelay => null;
+
         public Bindable<double> Progress = new BindableDouble();
 
         private Bindable<double> holdActivationDelay;
@@ -35,7 +43,9 @@ namespace osu.Game.Graphics.Containers
         [BackgroundDependencyLoader]
         private void load(OsuConfigManager config)
         {
-            holdActivationDelay = config.GetBindable<double>(OsuSetting.UIHoldActivationDelay);
+            holdActivationDelay = HoldActivationDelay != null
+                ? new Bindable<double>(HoldActivationDelay.Value)
+                : config.GetBindable<double>(OsuSetting.UIHoldActivationDelay);
         }
 
         protected void BeginConfirm()

osu.Game/Graphics/UserInterface/DialogButton.cs

@@ -45,8 +45,9 @@ namespace osu.Game.Graphics.UserInterface
             }
         }
 
+        protected readonly Container ColourContainer;
+
         private readonly Container backgroundContainer;
-        private readonly Container colourContainer;
         private readonly Container glowContainer;
         private readonly Box leftGlow;
         private readonly Box centerGlow;
@@ -113,7 +114,7 @@ namespace osu.Game.Graphics.UserInterface
                     Masking = true,
                     Children = new Drawable[]
                     {
-                        colourContainer = new Container
+                        ColourContainer = new Container
                         {
                             RelativeSizeAxes = Axes.Both,
                             Origin = Anchor.Centre,
@@ -182,7 +183,7 @@ namespace osu.Game.Graphics.UserInterface
             {
                 buttonColour = value;
                 updateGlow();
-                colourContainer.Colour = value;
+                ColourContainer.Colour = value;
             }
         }
 
@@ -230,11 +231,11 @@ namespace osu.Game.Graphics.UserInterface
                 Alpha = 0.05f
             };
 
-            colourContainer.Add(flash);
+            ColourContainer.Add(flash);
             flash.FadeOutFromOne(100).Expire();
 
             clickAnimating = true;
-            colourContainer.ResizeWidthTo(colourContainer.Width * 1.05f, 100, Easing.OutQuint)
+            ColourContainer.ResizeWidthTo(ColourContainer.Width * 1.05f, 100, Easing.OutQuint)
                            .OnComplete(_ =>
                            {
                                clickAnimating = false;
@@ -246,14 +247,14 @@ namespace osu.Game.Graphics.UserInterface
 
         protected override bool OnMouseDown(MouseDownEvent e)
         {
-            colourContainer.ResizeWidthTo(hover_width * 0.98f, click_duration * 4, Easing.OutQuad);
+            ColourContainer.ResizeWidthTo(hover_width * 0.98f, click_duration * 4, Easing.OutQuad);
             return base.OnMouseDown(e);
         }
 
         protected override void OnMouseUp(MouseUpEvent e)
         {
             if (State == SelectionState.Selected)
-                colourContainer.ResizeWidthTo(hover_width, click_duration, Easing.In);
+                ColourContainer.ResizeWidthTo(hover_width, click_duration, Easing.In);
             base.OnMouseUp(e);
         }
 
@@ -279,12 +280,12 @@ namespace osu.Game.Graphics.UserInterface
             if (newState == SelectionState.Selected)
             {
                 spriteText.TransformSpacingTo(hoverSpacing, hover_duration, Easing.OutElastic);
-                colourContainer.ResizeWidthTo(hover_width, hover_duration, Easing.OutElastic);
+                ColourContainer.ResizeWidthTo(hover_width, hover_duration, Easing.OutElastic);
                 glowContainer.FadeIn(hover_duration, Easing.OutQuint);
             }
             else
             {
-                colourContainer.ResizeWidthTo(idle_width, hover_duration, Easing.OutElastic);
+                ColourContainer.ResizeWidthTo(idle_width, hover_duration, Easing.OutElastic);
                 spriteText.TransformSpacingTo(Vector2.Zero, hover_duration, Easing.OutElastic);
                 glowContainer.FadeOut(hover_duration, Easing.OutQuint);
             }

osu.Game/IO/WrappedStorage.cs

@@ -70,9 +70,9 @@ namespace osu.Game.IO
         public override Stream GetStream(string path, FileAccess access = FileAccess.Read, FileMode mode = FileMode.OpenOrCreate) =>
             UnderlyingStorage.GetStream(MutatePath(path), access, mode);
 
-        public override void OpenFileExternally(string filename) => UnderlyingStorage.OpenFileExternally(MutatePath(filename));
+        public override bool OpenFileExternally(string filename) => UnderlyingStorage.OpenFileExternally(MutatePath(filename));
 
-        public override void PresentFileExternally(string filename) => UnderlyingStorage.PresentFileExternally(MutatePath(filename));
+        public override bool PresentFileExternally(string filename) => UnderlyingStorage.PresentFileExternally(MutatePath(filename));
 
         public override Storage GetStorageForDirectory(string path)
         {

osu.Game/Online/Multiplayer/Countdown/CountdownChangedEvent.cs

@@ -0,0 +1,22 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer.Countdown
+{
+    /// <summary>
+    /// Indicates a change to the <see cref="MultiplayerRoom"/>'s countdown.
+    /// </summary>
+    [MessagePackObject]
+    public class CountdownChangedEvent : MatchServerEvent
+    {
+        /// <summary>
+        /// The new countdown.
+        /// </summary>
+        [Key(0)]
+        public MultiplayerCountdown? Countdown { get; set; }
+    }
+}

osu.Game/Online/Multiplayer/Countdown/StartMatchCountdownRequest.cs

@@ -0,0 +1,23 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using MessagePack;
+
+#nullable enable
+
+namespace osu.Game.Online.Multiplayer.Countdown
+{
+    /// <summary>
+    /// A request for a countdown to start the match.
+    /// </summary>
+    [MessagePackObject]
+    public class StartMatchCountdownRequest : MatchUserRequest
+    {
+        /// <summary>
+        /// How long the countdown should last.
+        /// </summary>
+        [Key(0)]
+        public TimeSpan Duration { get; set; }
+    }
+}

osu.Game/Online/Multiplayer/Countdown/StopCountdownRequest.cs

@@ -0,0 +1,17 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer.Countdown
+{
+    /// <summary>
+    /// Request to stop the current countdown.
+    /// </summary>
+    [MessagePackObject]
+    public class StopCountdownRequest : MatchUserRequest
+    {
+    }
+}

osu.Game/Online/Multiplayer/MatchServerEvent.cs

@@ -1,8 +1,11 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+#nullable enable
+
 using System;
 using MessagePack;
+using osu.Game.Online.Multiplayer.Countdown;
 
 namespace osu.Game.Online.Multiplayer
 {
@@ -11,6 +14,8 @@ namespace osu.Game.Online.Multiplayer
     /// </summary>
     [Serializable]
     [MessagePackObject]
+    // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
+    [Union(0, typeof(CountdownChangedEvent))]
     public abstract class MatchServerEvent
     {
     }

osu.Game/Online/Multiplayer/MatchStartCountdown.cs

@@ -0,0 +1,17 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using MessagePack;
+
+namespace osu.Game.Online.Multiplayer
+{
+    /// <summary>
+    /// A <see cref="MultiplayerCountdown"/> which will start the match after ending.
+    /// </summary>
+    [MessagePackObject]
+    public class MatchStartCountdown : MultiplayerCountdown
+    {
+    }
+}

osu.Game/Online/Multiplayer/MatchTypes/TeamVersus/ChangeTeamRequest.cs

@@ -7,6 +7,7 @@ using MessagePack;
 
 namespace osu.Game.Online.Multiplayer.MatchTypes.TeamVersus
 {
+    [MessagePackObject]
     public class ChangeTeamRequest : MatchUserRequest
     {
         [Key(0)]

osu.Game/Online/Multiplayer/MatchUserRequest.cs

@@ -3,6 +3,7 @@
 
 using System;
 using MessagePack;
+using osu.Game.Online.Multiplayer.Countdown;
 using osu.Game.Online.Multiplayer.MatchTypes.TeamVersus;
 
 namespace osu.Game.Online.Multiplayer
@@ -12,7 +13,10 @@ namespace osu.Game.Online.Multiplayer
     /// </summary>
     [Serializable]
     [MessagePackObject]
-    [Union(0, typeof(ChangeTeamRequest))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
+    // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
+    [Union(0, typeof(ChangeTeamRequest))]
+    [Union(1, typeof(StartMatchCountdownRequest))]
+    [Union(2, typeof(StopCountdownRequest))]
     public abstract class MatchUserRequest
     {
     }

osu.Game/Online/Multiplayer/MultiplayerClient.cs

@@ -16,6 +16,7 @@ using osu.Framework.Logging;
 using osu.Game.Database;
 using osu.Game.Online.API;
 using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Online.Multiplayer.Countdown;
 using osu.Game.Online.Rooms;
 using osu.Game.Online.Rooms.RoomStatuses;
 using osu.Game.Rulesets;
@@ -170,6 +171,8 @@ namespace osu.Game.Online.Multiplayer
                     Room = joinedRoom;
                     APIRoom = room;
 
+                    Debug.Assert(joinedRoom.Playlist.Count > 0);
+
                     APIRoom.Playlist.Clear();
                     APIRoom.Playlist.AddRange(joinedRoom.Playlist.Select(createPlaylistItem));
 
@@ -534,7 +537,24 @@ namespace osu.Game.Online.Multiplayer
 
         public Task MatchEvent(MatchServerEvent e)
         {
-            // not used by any match types just yet.
+            if (Room == null)
+                return Task.CompletedTask;
+
+            Scheduler.Add(() =>
+            {
+                if (Room == null)
+                    return;
+
+                switch (e)
+                {
+                    case CountdownChangedEvent countdownChangedEvent:
+                        Room.Countdown = countdownChangedEvent.Countdown;
+                        break;
+                }
+
+                RoomUpdated?.Invoke();
+            }, false);
+
             return Task.CompletedTask;
         }
 
@@ -665,6 +685,8 @@ namespace osu.Game.Online.Multiplayer
                 Room.Playlist.Remove(Room.Playlist.Single(existing => existing.ID == playlistItemId));
                 APIRoom.Playlist.RemoveAll(existing => existing.ID == playlistItemId);
 
+                Debug.Assert(Room.Playlist.Count > 0);
+
                 ItemRemoved?.Invoke(playlistItemId);
                 RoomUpdated?.Invoke();
             });

osu.Game/Online/Multiplayer/MultiplayerCountdown.cs

@@ -0,0 +1,28 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using System;
+using MessagePack;
+using osu.Game.Online.Multiplayer.Countdown;
+
+namespace osu.Game.Online.Multiplayer
+{
+    /// <summary>
+    /// Describes the current countdown in a <see cref="MultiplayerRoom"/>.
+    /// </summary>
+    [MessagePackObject]
+    [Union(0, typeof(MatchStartCountdown))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
+    public abstract class MultiplayerCountdown
+    {
+        /// <summary>
+        /// The amount of time remaining in the countdown.
+        /// </summary>
+        /// <remarks>
+        /// This is only sent once from the server upon initial retrieval of the <see cref="MultiplayerRoom"/> or via a <see cref="CountdownChangedEvent"/>.
+        /// </remarks>
+        [Key(0)]
+        public TimeSpan TimeRemaining { get; set; }
+    }
+}

osu.Game/Online/Multiplayer/MultiplayerRoom.cs

@@ -54,6 +54,12 @@ namespace osu.Game.Online.Multiplayer
         [Key(6)]
         public IList<MultiplayerPlaylistItem> Playlist { get; set; } = new List<MultiplayerPlaylistItem>();
 
+        /// <summary>
+        /// The currently-running countdown.
+        /// </summary>
+        [Key(7)]
+        public MultiplayerCountdown? Countdown { get; set; }
+
         [JsonConstructor]
         [SerializationConstructor]
         public MultiplayerRoom(long roomId)

osu.Game/Online/SignalRWorkaroundTypes.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using osu.Game.Online.Multiplayer;
+using osu.Game.Online.Multiplayer.Countdown;
 using osu.Game.Online.Multiplayer.MatchTypes.TeamVersus;
 
 namespace osu.Game.Online
@@ -18,8 +19,12 @@ namespace osu.Game.Online
         internal static readonly IReadOnlyList<(Type derivedType, Type baseType)> BASE_TYPE_MAPPING = new[]
         {
             (typeof(ChangeTeamRequest), typeof(MatchUserRequest)),
+            (typeof(StartMatchCountdownRequest), typeof(MatchUserRequest)),
+            (typeof(StopCountdownRequest), typeof(MatchUserRequest)),
+            (typeof(CountdownChangedEvent), typeof(MatchServerEvent)),
             (typeof(TeamVersusRoomState), typeof(MatchRoomState)),
             (typeof(TeamVersusUserState), typeof(MatchUserState)),
+            (typeof(MatchStartCountdown), typeof(MultiplayerCountdown))
         };
     }
 }

osu.Game/OsuGame.cs

@@ -1046,6 +1046,10 @@ namespace osu.Game
 
             switch (e.Action)
             {
+                case GlobalAction.ToggleSkinEditor:
+                    skinEditor.ToggleVisibility();
+                    return true;
+
                 case GlobalAction.ResetInputSettings:
                     Host.ResetInputHandlers();
                     frameworkConfig.GetBindable<ConfineMouseMode>(FrameworkSetting.ConfineMouseMode).SetDefault();

osu.Game/OsuGameBase.cs

@@ -200,7 +200,7 @@ namespace osu.Game
             if (Storage.Exists(DatabaseContextFactory.DATABASE_NAME))
                 dependencies.Cache(EFContextFactory = new DatabaseContextFactory(Storage));
 
-            dependencies.Cache(realm = new RealmAccess(Storage, "client", EFContextFactory));
+            dependencies.Cache(realm = new RealmAccess(Storage, "client", Host.UpdateThread, EFContextFactory));
 
             dependencies.CacheAs<RulesetStore>(RulesetStore = new RealmRulesetStore(realm, Storage));
             dependencies.CacheAs<IRulesetStore>(RulesetStore);

osu.Game/Overlays/BeatmapSet/Scores/ScoreTable.cs

@@ -173,7 +173,9 @@ namespace osu.Game.Overlays.BeatmapSet.Scores
                 {
                     Text = score.MaxCombo.ToLocalisableString(@"0\x"),
                     Font = OsuFont.GetFont(size: text_size),
+#pragma warning disable 618
                     Colour = score.MaxCombo == score.BeatmapInfo.MaxCombo ? highAccuracyColour : Color4.White
+#pragma warning restore 618
                 }
             };
 

osu.Game/Overlays/BeatmapSet/Scores/ScoresContainer.cs

@@ -78,7 +78,9 @@ namespace osu.Game.Overlays.BeatmapSet.Scores
                 // TODO: temporary. should be removed once `OrderByTotalScore` can accept `IScoreInfo`.
                 var beatmapInfo = new BeatmapInfo
                 {
+#pragma warning disable 618
                     MaxCombo = apiBeatmap.MaxCombo,
+#pragma warning restore 618
                     Status = apiBeatmap.Status,
                     MD5Hash = apiBeatmap.MD5Hash
                 };

osu.Game/Overlays/Chat/ChannelList/ChannelListItem.cs

@@ -0,0 +1,171 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using System;
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Online.Chat;
+using osu.Game.Users.Drawables;
+using osuTK;
+
+namespace osu.Game.Overlays.Chat.ChannelList
+{
+    public class ChannelListItem : OsuClickableContainer
+    {
+        public event Action<Channel>? OnRequestSelect;
+        public event Action<Channel>? OnRequestLeave;
+
+        public readonly BindableInt Mentions = new BindableInt();
+
+        public readonly BindableBool Unread = new BindableBool();
+
+        private readonly Channel channel;
+
+        private Box? hoverBox;
+        private Box? selectBox;
+        private OsuSpriteText? text;
+        private ChannelListItemCloseButton? close;
+
+        [Resolved]
+        private Bindable<Channel> selectedChannel { get; set; } = null!;
+
+        [Resolved]
+        private OverlayColourProvider colourProvider { get; set; } = null!;
+
+        public ChannelListItem(Channel channel)
+        {
+            this.channel = channel;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Height = 30;
+            RelativeSizeAxes = Axes.X;
+
+            Children = new Drawable[]
+            {
+                hoverBox = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = colourProvider.Background3,
+                    Alpha = 0f,
+                },
+                selectBox = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = colourProvider.Background4,
+                    Alpha = 0f,
+                },
+                new Container
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Padding = new MarginPadding { Left = 18, Right = 10 },
+                    Child = new GridContainer
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        ColumnDimensions = new[]
+                        {
+                            new Dimension(GridSizeMode.AutoSize),
+                            new Dimension(),
+                            new Dimension(GridSizeMode.AutoSize),
+                            new Dimension(GridSizeMode.AutoSize),
+                        },
+                        Content = new[]
+                        {
+                            new[]
+                            {
+                                createIcon(),
+                                text = new OsuSpriteText
+                                {
+                                    Anchor = Anchor.CentreLeft,
+                                    Origin = Anchor.CentreLeft,
+                                    Text = channel.Name,
+                                    Font = OsuFont.Torus.With(size: 17, weight: FontWeight.SemiBold),
+                                    Colour = colourProvider.Light3,
+                                    Margin = new MarginPadding { Bottom = 2 },
+                                    RelativeSizeAxes = Axes.X,
+                                    Truncate = true,
+                                },
+                                new ChannelListItemMentionPill
+                                {
+                                    Anchor = Anchor.CentreLeft,
+                                    Origin = Anchor.CentreLeft,
+                                    Margin = new MarginPadding { Right = 3 },
+                                    Mentions = { BindTarget = Mentions },
+                                },
+                                close = new ChannelListItemCloseButton
+                                {
+                                    Anchor = Anchor.CentreLeft,
+                                    Origin = Anchor.CentreLeft,
+                                    Margin = new MarginPadding { Right = 3 },
+                                    Action = () => OnRequestLeave?.Invoke(channel),
+                                }
+                            }
+                        },
+                    },
+                },
+            };
+
+            Action = () => OnRequestSelect?.Invoke(channel);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            selectedChannel.BindValueChanged(change =>
+            {
+                if (change.NewValue == channel)
+                    selectBox?.FadeIn(300, Easing.OutQuint);
+                else
+                    selectBox?.FadeOut(200, Easing.OutQuint);
+            }, true);
+
+            Unread.BindValueChanged(change =>
+            {
+                text!.FadeColour(change.NewValue ? colourProvider.Content1 : colourProvider.Light3, 300, Easing.OutQuint);
+            }, true);
+        }
+
+        protected override bool OnHover(HoverEvent e)
+        {
+            hoverBox?.FadeIn(300, Easing.OutQuint);
+            close?.FadeIn(300, Easing.OutQuint);
+            return base.OnHover(e);
+        }
+
+        protected override void OnHoverLost(HoverLostEvent e)
+        {
+            hoverBox?.FadeOut(200, Easing.OutQuint);
+            close?.FadeOut(200, Easing.OutQuint);
+            base.OnHoverLost(e);
+        }
+
+        private Drawable createIcon()
+        {
+            if (channel.Type != ChannelType.PM)
+                return Drawable.Empty();
+
+            return new UpdateableAvatar(channel.Users.First(), isInteractive: false)
+            {
+                Size = new Vector2(20),
+                Margin = new MarginPadding { Right = 5 },
+                Anchor = Anchor.CentreLeft,
+                Origin = Anchor.CentreLeft,
+                CornerRadius = 10,
+                Masking = true,
+            };
+        }
+    }
+}

osu.Game/Overlays/Chat/ChannelList/ChannelListItemCloseButton.cs

@@ -0,0 +1,68 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Overlays.Chat.ChannelList
+{
+    public class ChannelListItemCloseButton : OsuClickableContainer
+    {
+        private SpriteIcon icon = null!;
+
+        private Color4 normalColour;
+        private Color4 hoveredColour;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour osuColour)
+        {
+            normalColour = osuColour.Red2;
+            hoveredColour = Color4.White;
+
+            Alpha = 0f;
+            Size = new Vector2(20);
+            Add(icon = new SpriteIcon
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Size = new Vector2(0.75f),
+                Icon = FontAwesome.Solid.TimesCircle,
+                RelativeSizeAxes = Axes.Both,
+                Colour = normalColour,
+            });
+        }
+
+        // Transforms matching OsuAnimatedButton
+        protected override bool OnHover(HoverEvent e)
+        {
+            icon.FadeColour(hoveredColour, 300, Easing.OutQuint);
+            return base.OnHover(e);
+        }
+
+        protected override void OnHoverLost(HoverLostEvent e)
+        {
+            icon.FadeColour(normalColour, 300, Easing.OutQuint);
+            base.OnHoverLost(e);
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            icon.ScaleTo(0.75f, 2000, Easing.OutQuint);
+            return base.OnMouseDown(e);
+        }
+
+        protected override void OnMouseUp(MouseUpEvent e)
+        {
+            icon.ScaleTo(1, 1000, Easing.OutElastic);
+            base.OnMouseUp(e);
+        }
+    }
+}

osu.Game/Overlays/Chat/ChannelList/ChannelListItemMentionPill.cs

@@ -0,0 +1,71 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Overlays.Chat.ChannelList
+{
+    public class ChannelListItemMentionPill : CircularContainer
+    {
+        public readonly BindableInt Mentions = new BindableInt();
+
+        private OsuSpriteText countText = null!;
+
+        private Box box = null!;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour osuColour, OverlayColourProvider colourProvider)
+        {
+            Masking = true;
+            Size = new Vector2(20, 12);
+            Alpha = 0f;
+
+            Children = new Drawable[]
+            {
+                box = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = osuColour.Orange1,
+                },
+                countText = new OsuSpriteText
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Font = OsuFont.Torus.With(size: 11, weight: FontWeight.Bold),
+                    Margin = new MarginPadding { Bottom = 1 },
+                    Colour = colourProvider.Background5,
+                },
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            Mentions.BindValueChanged(change =>
+            {
+                int mentionCount = change.NewValue;
+
+                countText.Text = mentionCount > 99 ? "99+" : mentionCount.ToString();
+
+                if (mentionCount > 0)
+                {
+                    this.FadeIn(1000, Easing.OutQuint);
+                    box.FlashColour(Color4.White, 500, Easing.OutQuint);
+                }
+                else
+                    this.FadeOut(100, Easing.OutQuint);
+            }, true);
+        }
+    }
+}

osu.Game/Overlays/ChatOverlay.cs

@@ -73,6 +73,10 @@ namespace osu.Game.Overlays
         private Container channelSelectionContainer;
         protected ChannelSelectionOverlay ChannelSelectionOverlay;
 
+        private readonly IBindableList<Channel> availableChannels = new BindableList<Channel>();
+        private readonly IBindableList<Channel> joinedChannels = new BindableList<Channel>();
+        private readonly Bindable<Channel> currentChannel = new Bindable<Channel>();
+
         public override bool Contains(Vector2 screenSpacePos) => chatContainer.ReceivePositionalInputAt(screenSpacePos)
                                                                  || (ChannelSelectionOverlay.State.Value == Visibility.Visible && ChannelSelectionOverlay.ReceivePositionalInputAt(screenSpacePos));
 
@@ -198,9 +202,13 @@ namespace osu.Game.Overlays
                 },
             };
 
+            availableChannels.BindTo(channelManager.AvailableChannels);
+            joinedChannels.BindTo(channelManager.JoinedChannels);
+            currentChannel.BindTo(channelManager.CurrentChannel);
+
             textBox.OnCommit += postMessage;
 
-            ChannelTabControl.Current.ValueChanged += current => channelManager.CurrentChannel.Value = current.NewValue;
+            ChannelTabControl.Current.ValueChanged += current => currentChannel.Value = current.NewValue;
             ChannelTabControl.ChannelSelectorActive.ValueChanged += active => ChannelSelectionOverlay.State.Value = active.NewValue ? Visibility.Visible : Visibility.Hidden;
             ChannelSelectionOverlay.State.ValueChanged += state =>
             {
@@ -238,18 +246,12 @@ namespace osu.Game.Overlays
             Schedule(() =>
             {
                 // TODO: consider scheduling bindable callbacks to not perform when overlay is not present.
-                channelManager.JoinedChannels.BindCollectionChanged(joinedChannelsChanged, true);
-
-                channelManager.AvailableChannels.CollectionChanged += availableChannelsChanged;
-                availableChannelsChanged(null, null);
-
-                currentChannel = channelManager.CurrentChannel.GetBoundCopy();
+                joinedChannels.BindCollectionChanged(joinedChannelsChanged, true);
+                availableChannels.BindCollectionChanged(availableChannelsChanged, true);
                 currentChannel.BindValueChanged(currentChannelChanged, true);
             });
         }
 
-        private Bindable<Channel> currentChannel;
-
         private void currentChannelChanged(ValueChangedEvent<Channel> e)
         {
             if (e.NewValue == null)
@@ -318,7 +320,7 @@ namespace osu.Game.Overlays
                 if (!channel.Joined.Value)
                     channel = channelManager.JoinChannel(channel);
 
-                channelManager.CurrentChannel.Value = channel;
+                currentChannel.Value = channel;
             }
 
             channel.HighlightedMessage.Value = message;
@@ -407,7 +409,7 @@ namespace osu.Game.Overlays
                     return true;
 
                 case PlatformAction.DocumentClose:
-                    channelManager.LeaveChannel(channelManager.CurrentChannel.Value);
+                    channelManager.LeaveChannel(currentChannel.Value);
                     return true;
             }
 
@@ -487,19 +489,7 @@ namespace osu.Game.Overlays
 
         private void availableChannelsChanged(object sender, NotifyCollectionChangedEventArgs args)
         {
-            ChannelSelectionOverlay.UpdateAvailableChannels(channelManager.AvailableChannels);
-        }
-
-        protected override void Dispose(bool isDisposing)
-        {
-            base.Dispose(isDisposing);
-
-            if (channelManager != null)
-            {
-                channelManager.CurrentChannel.ValueChanged -= currentChannelChanged;
-                channelManager.JoinedChannels.CollectionChanged -= joinedChannelsChanged;
-                channelManager.AvailableChannels.CollectionChanged -= availableChannelsChanged;
-            }
+            ChannelSelectionOverlay.UpdateAvailableChannels(availableChannels);
         }
 
         private void postMessage(TextBox textBox, bool newText)

osu.Game/Overlays/Dialog/PopupDialog.cs

@@ -219,7 +219,12 @@ namespace osu.Game.Overlays.Dialog
         /// <summary>
         /// Programmatically clicks the first <see cref="PopupDialogOkButton"/>.
         /// </summary>
-        public void PerformOkAction() => Buttons.OfType<PopupDialogOkButton>().First().TriggerClick();
+        public void PerformOkAction() => PerformAction<PopupDialogOkButton>();
+
+        /// <summary>
+        /// Programmatically clicks the first button of the provided type.
+        /// </summary>
+        public void PerformAction<T>() where T : PopupDialogButton => Buttons.OfType<T>().First().TriggerClick();
 
         protected override bool OnKeyDown(KeyDownEvent e)
         {

osu.Game/Overlays/Dialog/PopupDialogDangerousButton.cs

@@ -0,0 +1,59 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+
+namespace osu.Game.Overlays.Dialog
+{
+    public class PopupDialogDangerousButton : PopupDialogButton
+    {
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            ButtonColour = colours.Red3;
+
+            ColourContainer.Add(new ConfirmFillBox
+            {
+                Action = () => Action(),
+                RelativeSizeAxes = Axes.Both,
+                Blending = BlendingParameters.Additive,
+            });
+        }
+
+        private class ConfirmFillBox : HoldToConfirmContainer
+        {
+            private Box box;
+
+            protected override double? HoldActivationDelay => 500;
+
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
+
+                Child = box = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                };
+
+                Progress.BindValueChanged(progress => box.Width = (float)progress.NewValue, true);
+            }
+
+            protected override bool OnMouseDown(MouseDownEvent e)
+            {
+                BeginConfirm();
+                return true;
+            }
+
+            protected override void OnMouseUp(MouseUpEvent e)
+            {
+                if (!e.HasAnyButtonPressed)
+                    AbortConfirm();
+            }
+        }
+    }
+}

osu.Game/Overlays/Settings/Sections/General/UpdateSettings.cs

@@ -68,7 +68,7 @@ namespace osu.Game.Overlays.Settings.Sections.General
                 Add(new SettingsButton
                 {
                     Text = GeneralSettingsStrings.OpenOsuFolder,
-                    Action = storage.PresentExternally,
+                    Action = () => storage.PresentExternally(),
                 });
 
                 Add(new SettingsButton

osu.Game/Overlays/Settings/Sections/SkinSection.cs

@@ -64,7 +64,7 @@ namespace osu.Game.Overlays.Settings.Sections
                 new SettingsButton
                 {
                     Text = SkinSettingsStrings.SkinLayoutEditor,
-                    Action = () => skinEditor?.Toggle(),
+                    Action = () => skinEditor?.ToggleVisibility(),
                 },
                 new ExportSkinButton(),
             };

osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs

@@ -500,12 +500,15 @@ namespace osu.Game.Rulesets.Objects.Legacy
                 => new LegacyHitSampleInfo(newName.GetOr(Name), newBank.GetOr(Bank), newVolume.GetOr(Volume), newCustomSampleBank.GetOr(CustomSampleBank), newIsLayered.GetOr(IsLayered));
 
             public bool Equals(LegacyHitSampleInfo? other)
-                => base.Equals(other) && CustomSampleBank == other.CustomSampleBank;
+                // The additions to equality checks here are *required* to ensure that pooling works correctly.
+                // Of note, `IsLayered` may cause the usage of `SampleVirtual` instead of an actual sample (in cases playback is not required).
+                // Removing it would cause samples which may actually require playback to potentially source for a `SampleVirtual` sample pool.
+                => base.Equals(other) && CustomSampleBank == other.CustomSampleBank && IsLayered == other.IsLayered;
 
             public override bool Equals(object? obj)
                 => obj is LegacyHitSampleInfo other && Equals(other);
 
-            public override int GetHashCode() => HashCode.Combine(base.GetHashCode(), CustomSampleBank);
+            public override int GetHashCode() => HashCode.Combine(base.GetHashCode(), CustomSampleBank, IsLayered);
         }
 
         private class FileHitSampleInfo : LegacyHitSampleInfo, IEquatable<FileHitSampleInfo>

osu.Game/Rulesets/Scoring/HitResult.cs

@@ -122,7 +122,19 @@ namespace osu.Game.Rulesets.Scoring
     public static class HitResultExtensions
     {
         /// <summary>
-        /// Whether a <see cref="HitResult"/> increases/decreases the combo, and affects the combo portion of the score.
+        /// Whether a <see cref="HitResult"/> increases the combo.
+        /// </summary>
+        public static bool IncreasesCombo(this HitResult result)
+            => AffectsCombo(result) && IsHit(result);
+
+        /// <summary>
+        /// Whether a <see cref="HitResult"/> breaks the combo and resets it back to zero.
+        /// </summary>
+        public static bool BreaksCombo(this HitResult result)
+            => AffectsCombo(result) && !IsHit(result);
+
+        /// <summary>
+        /// Whether a <see cref="HitResult"/> increases/breaks the combo, and affects the combo portion of the score.
         /// </summary>
         public static bool AffectsCombo(this HitResult result)
         {

osu.Game/Rulesets/Scoring/ScoreProcessor.cs

@@ -166,20 +166,10 @@ namespace osu.Game.Rulesets.Scoring
             if (!result.Type.IsScorable())
                 return;
 
-            if (result.Type.AffectsCombo())
-            {
-                switch (result.Type)
-                {
-                    case HitResult.Miss:
-                    case HitResult.LargeTickMiss:
-                        Combo.Value = 0;
-                        break;
-
-                    default:
-                        Combo.Value++;
-                        break;
-                }
-            }
+            if (result.Type.IncreasesCombo())
+                Combo.Value++;
+            else if (result.Type.BreaksCombo())
+                Combo.Value = 0;
 
             double scoreIncrease = result.Type.IsHit() ? result.Judgement.NumericResultFor(result) : 0;
 

osu.Game/Rulesets/UI/Playfield.cs

@@ -323,7 +323,7 @@ namespace osu.Game.Rulesets.UI
         /// </param>
         /// <typeparam name="TObject">The <see cref="HitObject"/> type.</typeparam>
         /// <typeparam name="TDrawable">The <see cref="DrawableHitObject"/> receiver for <typeparamref name="TObject"/>s.</typeparam>
-        protected void RegisterPool<TObject, TDrawable>(int initialSize, int? maximumSize = null)
+        public void RegisterPool<TObject, TDrawable>(int initialSize, int? maximumSize = null)
             where TObject : HitObject
             where TDrawable : DrawableHitObject, new()
             => RegisterPool<TObject, TDrawable>(new DrawablePool<TDrawable>(initialSize, maximumSize));

osu.Game/Scoring/Legacy/LegacyScoreDecoder.cs

@@ -23,6 +23,8 @@ namespace osu.Game.Scoring.Legacy
         private IBeatmap currentBeatmap;
         private Ruleset currentRuleset;
 
+        private float beatmapOffset;
+
         public Score Parse(Stream stream)
         {
             var score = new Score
@@ -72,6 +74,9 @@ namespace osu.Game.Scoring.Legacy
                 currentBeatmap = workingBeatmap.GetPlayableBeatmap(currentRuleset.RulesetInfo, scoreInfo.Mods);
                 scoreInfo.BeatmapInfo = currentBeatmap.BeatmapInfo;
 
+                // As this is baked into hitobject timing (see `LegacyBeatmapDecoder`) we also need to apply this to replay frame timing.
+                beatmapOffset = currentBeatmap.BeatmapInfo.BeatmapVersion < 5 ? LegacyBeatmapDecoder.EARLY_VERSION_TIMING_OFFSET : 0;
+
                 /* score.HpGraphString = */
                 sr.ReadString();
 
@@ -229,7 +234,7 @@ namespace osu.Game.Scoring.Legacy
 
         private void readLegacyReplay(Replay replay, StreamReader reader)
         {
-            float lastTime = 0;
+            float lastTime = beatmapOffset;
             ReplayFrame currentFrame = null;
 
             string[] frames = reader.ReadToEnd().Split(',');

osu.Game/Scoring/Legacy/LegacyScoreEncoder.cs

@@ -1,12 +1,15 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+#nullable enable
+
 using System;
 using System.IO;
 using System.Linq;
 using System.Text;
 using osu.Framework.Extensions;
 using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Formats;
 using osu.Game.Extensions;
 using osu.Game.IO.Legacy;
 using osu.Game.Replays.Legacy;
@@ -14,8 +17,6 @@ using osu.Game.Rulesets.Replays;
 using osu.Game.Rulesets.Replays.Types;
 using SharpCompress.Compressors.LZMA;
 
-#nullable enable
-
 namespace osu.Game.Scoring.Legacy
 {
     public class LegacyScoreEncoder
@@ -111,6 +112,9 @@ namespace osu.Game.Scoring.Legacy
             {
                 StringBuilder replayData = new StringBuilder();
 
+                // As this is baked into hitobject timing (see `LegacyBeatmapDecoder`) we also need to apply this to replay frame timing.
+                double offset = beatmap?.BeatmapInfo.BeatmapVersion < 5 ? -LegacyBeatmapDecoder.EARLY_VERSION_TIMING_OFFSET : 0;
+
                 if (score.Replay != null)
                 {
                     int lastTime = 0;
@@ -120,7 +124,7 @@ namespace osu.Game.Scoring.Legacy
                         var legacyFrame = getLegacyFrame(f);
 
                         // Rounding because stable could only parse integral values
-                        int time = (int)Math.Round(legacyFrame.Time);
+                        int time = (int)Math.Round(legacyFrame.Time + offset);
                         replayData.Append(FormattableString.Invariant($"{time - lastTime}|{legacyFrame.MouseX ?? 0}|{legacyFrame.MouseY ?? 0}|{(int)legacyFrame.ButtonState},"));
                         lastTime = time;
                     }

osu.Game/Scoring/ScoreInfo.cs

@@ -157,7 +157,7 @@ namespace osu.Game.Scoring
         public LocalisableString DisplayAccuracy => Accuracy.FormatAccuracy();
 
         /// <summary>
-        /// Whether this <see cref="EFScoreInfo"/> represents a legacy (osu!stable) score.
+        /// Whether this <see cref="ScoreInfo"/> represents a legacy (osu!stable) score.
         /// </summary>
         [Ignored]
         public bool IsLegacyScore => Mods.OfType<ModClassic>().Any();

osu.Game/Scoring/ScoreManager.cs

@@ -134,35 +134,9 @@ namespace osu.Game.Scoring
             if (string.IsNullOrEmpty(score.BeatmapInfo.MD5Hash))
                 return score.TotalScore;
 
-            int beatmapMaxCombo;
-
-            if (score.IsLegacyScore)
-            {
-                // This score is guaranteed to be an osu!stable score.
-                // The combo must be determined through either the beatmap's max combo value or the difficulty calculator, as lazer's scoring has changed and the score statistics cannot be used.
-                if (score.BeatmapInfo.MaxCombo != null)
-                    beatmapMaxCombo = score.BeatmapInfo.MaxCombo.Value;
-                else
-                {
-                    if (difficulties == null)
-                        return score.TotalScore;
-
-                    // We can compute the max combo locally after the async beatmap difficulty computation.
-                    var difficulty = await difficulties().GetDifficultyAsync(score.BeatmapInfo, score.Ruleset, score.Mods, cancellationToken).ConfigureAwait(false);
-
-                    // Something failed during difficulty calculation. Fall back to provided score.
-                    if (difficulty == null)
-                        return score.TotalScore;
-
-                    beatmapMaxCombo = difficulty.Value.MaxCombo;
-                }
-            }
-            else
-            {
-                // This is guaranteed to be a non-legacy score.
-                // The combo must be determined through the score's statistics, as both the beatmap's max combo and the difficulty calculator will provide osu!stable combo values.
-                beatmapMaxCombo = Enum.GetValues(typeof(HitResult)).OfType<HitResult>().Where(r => r.AffectsCombo()).Select(r => score.Statistics.GetValueOrDefault(r)).Sum();
-            }
+            int? beatmapMaxCombo = await GetMaximumAchievableComboAsync(score, cancellationToken).ConfigureAwait(false);
+            if (beatmapMaxCombo == null)
+                return score.TotalScore;
 
             if (beatmapMaxCombo == 0)
                 return 0;
@@ -171,7 +145,37 @@ namespace osu.Game.Scoring
             var scoreProcessor = ruleset.CreateScoreProcessor();
             scoreProcessor.Mods.Value = score.Mods;
 
-            return (long)Math.Round(scoreProcessor.ComputeFinalLegacyScore(mode, score, beatmapMaxCombo));
+            return (long)Math.Round(scoreProcessor.ComputeFinalLegacyScore(mode, score, beatmapMaxCombo.Value));
+        }
+
+        /// <summary>
+        /// Retrieves the maximum achievable combo for the provided score.
+        /// </summary>
+        /// <param name="score">The <see cref="ScoreInfo"/> to compute the maximum achievable combo for.</param>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to cancel the process.</param>
+        /// <returns>The maximum achievable combo. A <see langword="null"/> return value indicates the difficulty cache has failed to retrieve the combo.</returns>
+        public async Task<int?> GetMaximumAchievableComboAsync([NotNull] ScoreInfo score, CancellationToken cancellationToken = default)
+        {
+            if (score.IsLegacyScore)
+            {
+                // This score is guaranteed to be an osu!stable score.
+                // The combo must be determined through either the beatmap's max combo value or the difficulty calculator, as lazer's scoring has changed and the score statistics cannot be used.
+#pragma warning disable CS0618
+                if (score.BeatmapInfo.MaxCombo != null)
+                    return score.BeatmapInfo.MaxCombo.Value;
+#pragma warning restore CS0618
+
+                if (difficulties == null)
+                    return null;
+
+                // We can compute the max combo locally after the async beatmap difficulty computation.
+                var difficulty = await difficulties().GetDifficultyAsync(score.BeatmapInfo, score.Ruleset, score.Mods, cancellationToken).ConfigureAwait(false);
+                return difficulty?.MaxCombo;
+            }
+
+            // This is guaranteed to be a non-legacy score.
+            // The combo must be determined through the score's statistics, as both the beatmap's max combo and the difficulty calculator will provide osu!stable combo values.
+            return Enum.GetValues(typeof(HitResult)).OfType<HitResult>().Where(r => r.AffectsCombo()).Select(r => score.Statistics.GetValueOrDefault(r)).Sum();
         }
 
         /// <summary>

osu.Game/Screens/Edit/Editor.cs

@@ -97,7 +97,7 @@ namespace osu.Game.Screens.Edit
 
         private bool canSave;
 
-        private bool exitConfirmed;
+        protected bool ExitConfirmed { get; private set; }
 
         private string lastSavedHash;
 
@@ -586,7 +586,7 @@ namespace osu.Game.Screens.Edit
 
         public override bool OnExiting(IScreen next)
         {
-            if (!exitConfirmed)
+            if (!ExitConfirmed)
             {
                 // dialog overlay may not be available in visual tests.
                 if (dialogOverlay == null)
@@ -595,12 +595,9 @@ namespace osu.Game.Screens.Edit
                     return true;
                 }
 
-                // if the dialog is already displayed, confirm exit with no save.
-                if (dialogOverlay.CurrentDialog is PromptForSaveDialog saveDialog)
-                {
-                    saveDialog.PerformOkAction();
+                // if the dialog is already displayed, block exiting until the user explicitly makes a decision.
+                if (dialogOverlay.CurrentDialog is PromptForSaveDialog)
                     return true;
-                }
 
                 if (isNewBeatmap || HasUnsavedChanges)
                 {
@@ -645,7 +642,7 @@ namespace osu.Game.Screens.Edit
         {
             Save();
 
-            exitConfirmed = true;
+            ExitConfirmed = true;
             this.Exit();
         }
 
@@ -668,7 +665,7 @@ namespace osu.Game.Screens.Edit
                 Beatmap.SetDefault();
             }
 
-            exitConfirmed = true;
+            ExitConfirmed = true;
             this.Exit();
         }
 

osu.Game/Screens/Edit/PromptForSaveDialog.cs

@@ -17,12 +17,12 @@ namespace osu.Game.Screens.Edit
 
             Buttons = new PopupDialogButton[]
             {
-                new PopupDialogCancelButton
+                new PopupDialogOkButton
                 {
                     Text = @"Save my masterpiece!",
                     Action = saveAndExit
                 },
-                new PopupDialogOkButton
+                new PopupDialogDangerousButton
                 {
                     Text = @"Forget all changes",
                     Action = exit

osu.Game/Screens/Menu/ButtonSystem.cs

@@ -79,10 +79,10 @@ namespace osu.Game.Screens.Menu
 
         private readonly ButtonArea buttonArea;
 
-        private readonly Button backButton;
+        private readonly MainMenuButton backButton;
 
-        private readonly List<Button> buttonsTopLevel = new List<Button>();
-        private readonly List<Button> buttonsPlay = new List<Button>();
+        private readonly List<MainMenuButton> buttonsTopLevel = new List<MainMenuButton>();
+        private readonly List<MainMenuButton> buttonsPlay = new List<MainMenuButton>();
 
         private Sample sampleBack;
 
@@ -100,8 +100,8 @@ namespace osu.Game.Screens.Menu
 
             buttonArea.AddRange(new Drawable[]
             {
-                new Button(ButtonSystemStrings.Settings, string.Empty, FontAwesome.Solid.Cog, new Color4(85, 85, 85, 255), () => OnSettings?.Invoke(), -WEDGE_WIDTH, Key.O),
-                backButton = new Button(ButtonSystemStrings.Back, @"button-back-select", OsuIcon.LeftCircle, new Color4(51, 58, 94, 255), () => State = ButtonSystemState.TopLevel, -WEDGE_WIDTH)
+                new MainMenuButton(ButtonSystemStrings.Settings, string.Empty, FontAwesome.Solid.Cog, new Color4(85, 85, 85, 255), () => OnSettings?.Invoke(), -WEDGE_WIDTH, Key.O),
+                backButton = new MainMenuButton(ButtonSystemStrings.Back, @"button-back-select", OsuIcon.LeftCircle, new Color4(51, 58, 94, 255), () => State = ButtonSystemState.TopLevel, -WEDGE_WIDTH)
                 {
                     VisibleState = ButtonSystemState.Play,
                 },
@@ -126,24 +126,24 @@ namespace osu.Game.Screens.Menu
         [BackgroundDependencyLoader(true)]
         private void load(AudioManager audio, IdleTracker idleTracker, GameHost host)
         {
-            buttonsPlay.Add(new Button(ButtonSystemStrings.Solo, @"button-solo-select", FontAwesome.Solid.User, new Color4(102, 68, 204, 255), () => OnSolo?.Invoke(), WEDGE_WIDTH, Key.P));
-            buttonsPlay.Add(new Button(ButtonSystemStrings.Multi, @"button-generic-select", FontAwesome.Solid.Users, new Color4(94, 63, 186, 255), onMultiplayer, 0, Key.M));
-            buttonsPlay.Add(new Button(ButtonSystemStrings.Playlists, @"button-generic-select", OsuIcon.Charts, new Color4(94, 63, 186, 255), onPlaylists, 0, Key.L));
+            buttonsPlay.Add(new MainMenuButton(ButtonSystemStrings.Solo, @"button-solo-select", FontAwesome.Solid.User, new Color4(102, 68, 204, 255), () => OnSolo?.Invoke(), WEDGE_WIDTH, Key.P));
+            buttonsPlay.Add(new MainMenuButton(ButtonSystemStrings.Multi, @"button-generic-select", FontAwesome.Solid.Users, new Color4(94, 63, 186, 255), onMultiplayer, 0, Key.M));
+            buttonsPlay.Add(new MainMenuButton(ButtonSystemStrings.Playlists, @"button-generic-select", OsuIcon.Charts, new Color4(94, 63, 186, 255), onPlaylists, 0, Key.L));
             buttonsPlay.ForEach(b => b.VisibleState = ButtonSystemState.Play);
 
-            buttonsTopLevel.Add(new Button(ButtonSystemStrings.Play, @"button-play-select", OsuIcon.Logo, new Color4(102, 68, 204, 255), () => State = ButtonSystemState.Play, WEDGE_WIDTH, Key.P));
-            buttonsTopLevel.Add(new Button(ButtonSystemStrings.Edit, @"button-edit-select", OsuIcon.EditCircle, new Color4(238, 170, 0, 255), () => OnEdit?.Invoke(), 0, Key.E));
-            buttonsTopLevel.Add(new Button(ButtonSystemStrings.Browse, @"button-direct-select", OsuIcon.ChevronDownCircle, new Color4(165, 204, 0, 255), () => OnBeatmapListing?.Invoke(), 0, Key.D));
+            buttonsTopLevel.Add(new MainMenuButton(ButtonSystemStrings.Play, @"button-play-select", OsuIcon.Logo, new Color4(102, 68, 204, 255), () => State = ButtonSystemState.Play, WEDGE_WIDTH, Key.P));
+            buttonsTopLevel.Add(new MainMenuButton(ButtonSystemStrings.Edit, @"button-edit-select", OsuIcon.EditCircle, new Color4(238, 170, 0, 255), () => OnEdit?.Invoke(), 0, Key.E));
+            buttonsTopLevel.Add(new MainMenuButton(ButtonSystemStrings.Browse, @"button-direct-select", OsuIcon.ChevronDownCircle, new Color4(165, 204, 0, 255), () => OnBeatmapListing?.Invoke(), 0, Key.D));
 
             if (host.CanExit)
-                buttonsTopLevel.Add(new Button(ButtonSystemStrings.Exit, string.Empty, OsuIcon.CrossCircle, new Color4(238, 51, 153, 255), () => OnExit?.Invoke(), 0, Key.Q));
+                buttonsTopLevel.Add(new MainMenuButton(ButtonSystemStrings.Exit, string.Empty, OsuIcon.CrossCircle, new Color4(238, 51, 153, 255), () => OnExit?.Invoke(), 0, Key.Q));
 
             buttonArea.AddRange(buttonsPlay);
             buttonArea.AddRange(buttonsTopLevel);
 
             buttonArea.ForEach(b =>
             {
-                if (b is Button)
+                if (b is MainMenuButton)
                 {
                     b.Origin = Anchor.CentreLeft;
                     b.Anchor = Anchor.CentreLeft;
@@ -305,7 +305,7 @@ namespace osu.Game.Screens.Menu
                 {
                     buttonArea.ButtonSystemState = state;
 
-                    foreach (var b in buttonArea.Children.OfType<Button>())
+                    foreach (var b in buttonArea.Children.OfType<MainMenuButton>())
                         b.ButtonSystemState = state;
                 }
 

osu.Game/Screens/Menu/MainMenuButton.cs

@@ -28,7 +28,7 @@ namespace osu.Game.Screens.Menu
     /// Button designed specifically for the osu!next main menu.
     /// In order to correctly flow, we have to use a negative margin on the parent container (due to the parallelogram shape).
     /// </summary>
-    public class Button : BeatSyncedContainer, IStateful<ButtonState>
+    public class MainMenuButton : BeatSyncedContainer, IStateful<ButtonState>
     {
         public event Action<ButtonState> StateChanged;
 
@@ -51,7 +51,7 @@ namespace osu.Game.Screens.Menu
 
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => box.ReceivePositionalInputAt(screenSpacePos);
 
-        public Button(LocalisableString text, string sampleName, IconUsage symbol, Color4 colour, Action clickAction = null, float extraWidth = 0, Key triggerKey = Key.Unknown)
+        public MainMenuButton(LocalisableString text, string sampleName, IconUsage symbol, Color4 colour, Action clickAction = null, float extraWidth = 0, Key triggerKey = Key.Unknown)
         {
             this.sampleName = sampleName;
             this.clickAction = clickAction;
@@ -209,7 +209,7 @@ namespace osu.Game.Screens.Menu
 
         protected override bool OnKeyDown(KeyDownEvent e)
         {
-            if (e.Repeat || e.ControlPressed || e.ShiftPressed || e.AltPressed)
+            if (e.Repeat || e.ControlPressed || e.ShiftPressed || e.AltPressed || e.SuperPressed)
                 return false;
 
             if (TriggerKey == e.Key && TriggerKey != Key.Unknown)

osu.Game/Screens/OnlinePlay/Components/ReadyButton.cs

@@ -15,12 +15,12 @@ namespace osu.Game.Screens.OnlinePlay.Components
     {
         public new readonly BindableBool Enabled = new BindableBool();
 
-        private IBindable<BeatmapAvailability> availability;
+        private readonly IBindable<BeatmapAvailability> availability = new Bindable<BeatmapAvailability>();
 
         [BackgroundDependencyLoader]
         private void load(OnlinePlayBeatmapAvailabilityTracker beatmapTracker)
         {
-            availability = beatmapTracker.Availability.GetBoundCopy();
+            availability.BindTo(beatmapTracker.Availability);
 
             availability.BindValueChanged(_ => updateState());
             Enabled.BindValueChanged(_ => updateState(), true);

osu.Game/Screens/OnlinePlay/Match/RoomSubScreen.cs

@@ -12,6 +12,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Screens;
 using osu.Game.Audio;
@@ -100,122 +101,126 @@ namespace osu.Game.Screens.OnlinePlay.Match
         {
             sampleStart = audio.Samples.Get(@"SongSelect/confirm-selection");
 
-            InternalChildren = new Drawable[]
+            InternalChild = new PopoverContainer
             {
-                beatmapAvailabilityTracker,
-                new MultiplayerRoomSounds(),
-                new GridContainer
+                RelativeSizeAxes = Axes.Both,
+                Children = new Drawable[]
                 {
-                    RelativeSizeAxes = Axes.Both,
-                    RowDimensions = new[]
+                    beatmapAvailabilityTracker,
+                    new MultiplayerRoomSounds(),
+                    new GridContainer
                     {
-                        new Dimension(),
-                        new Dimension(GridSizeMode.Absolute, 50)
-                    },
-                    Content = new[]
-                    {
-                        // Padded main content (drawable room + main content)
-                        new Drawable[]
+                        RelativeSizeAxes = Axes.Both,
+                        RowDimensions = new[]
                         {
-                            new Container
+                            new Dimension(),
+                            new Dimension(GridSizeMode.Absolute, 50)
+                        },
+                        Content = new[]
+                        {
+                            // Padded main content (drawable room + main content)
+                            new Drawable[]
                             {
-                                RelativeSizeAxes = Axes.Both,
-                                Padding = new MarginPadding
+                                new Container
                                 {
-                                    Horizontal = WaveOverlayContainer.WIDTH_PADDING,
-                                    Bottom = 30
-                                },
-                                Children = new[]
-                                {
-                                    mainContent = new GridContainer
+                                    RelativeSizeAxes = Axes.Both,
+                                    Padding = new MarginPadding
                                     {
-                                        RelativeSizeAxes = Axes.Both,
-                                        RowDimensions = new[]
+                                        Horizontal = WaveOverlayContainer.WIDTH_PADDING,
+                                        Bottom = 30
+                                    },
+                                    Children = new[]
+                                    {
+                                        mainContent = new GridContainer
                                         {
-                                            new Dimension(GridSizeMode.AutoSize),
-                                            new Dimension(GridSizeMode.Absolute, 10)
-                                        },
-                                        Content = new[]
-                                        {
-                                            new Drawable[]
+                                            RelativeSizeAxes = Axes.Both,
+                                            RowDimensions = new[]
                                             {
-                                                new DrawableMatchRoom(Room, allowEdit)
-                                                {
-                                                    OnEdit = () => settingsOverlay.Show(),
-                                                    SelectedItem = { BindTarget = SelectedItem }
-                                                }
+                                                new Dimension(GridSizeMode.AutoSize),
+                                                new Dimension(GridSizeMode.Absolute, 10)
                                             },
-                                            null,
-                                            new Drawable[]
+                                            Content = new[]
                                             {
-                                                new Container
+                                                new Drawable[]
                                                 {
-                                                    RelativeSizeAxes = Axes.Both,
-                                                    Children = new[]
+                                                    new DrawableMatchRoom(Room, allowEdit)
                                                     {
-                                                        new Container
+                                                        OnEdit = () => settingsOverlay.Show(),
+                                                        SelectedItem = { BindTarget = SelectedItem }
+                                                    }
+                                                },
+                                                null,
+                                                new Drawable[]
+                                                {
+                                                    new Container
+                                                    {
+                                                        RelativeSizeAxes = Axes.Both,
+                                                        Children = new[]
                                                         {
-                                                            RelativeSizeAxes = Axes.Both,
-                                                            Masking = true,
-                                                            CornerRadius = 10,
-                                                            Child = new Box
+                                                            new Container
                                                             {
                                                                 RelativeSizeAxes = Axes.Both,
-                                                                Colour = Color4Extensions.FromHex(@"3e3a44") // Temporary.
+                                                                Masking = true,
+                                                                CornerRadius = 10,
+                                                                Child = new Box
+                                                                {
+                                                                    RelativeSizeAxes = Axes.Both,
+                                                                    Colour = Color4Extensions.FromHex(@"3e3a44") // Temporary.
+                                                                },
                                                             },
-                                                        },
-                                                        new Container
-                                                        {
-                                                            RelativeSizeAxes = Axes.Both,
-                                                            Padding = new MarginPadding(20),
-                                                            Child = CreateMainContent(),
-                                                        },
-                                                        new Container
-                                                        {
-                                                            Anchor = Anchor.BottomLeft,
-                                                            Origin = Anchor.BottomLeft,
-                                                            RelativeSizeAxes = Axes.X,
-                                                            AutoSizeAxes = Axes.Y,
-                                                            Child = userModsSelectOverlay = new UserModSelectOverlay
+                                                            new Container
                                                             {
-                                                                SelectedMods = { BindTarget = UserMods },
-                                                                IsValidMod = _ => false
-                                                            }
-                                                        },
+                                                                RelativeSizeAxes = Axes.Both,
+                                                                Padding = new MarginPadding(20),
+                                                                Child = CreateMainContent(),
+                                                            },
+                                                            new Container
+                                                            {
+                                                                Anchor = Anchor.BottomLeft,
+                                                                Origin = Anchor.BottomLeft,
+                                                                RelativeSizeAxes = Axes.X,
+                                                                AutoSizeAxes = Axes.Y,
+                                                                Child = userModsSelectOverlay = new UserModSelectOverlay
+                                                                {
+                                                                    SelectedMods = { BindTarget = UserMods },
+                                                                    IsValidMod = _ => false
+                                                                }
+                                                            },
+                                                        }
                                                     }
                                                 }
                                             }
+                                        },
+                                        new Container
+                                        {
+                                            RelativeSizeAxes = Axes.Both,
+                                            // Resolves 1px masking errors between the settings overlay and the room panel.
+                                            Padding = new MarginPadding(-1),
+                                            Child = settingsOverlay = CreateRoomSettingsOverlay(Room)
                                         }
                                     },
-                                    new Container
-                                    {
-                                        RelativeSizeAxes = Axes.Both,
-                                        // Resolves 1px masking errors between the settings overlay and the room panel.
-                                        Padding = new MarginPadding(-1),
-                                        Child = settingsOverlay = CreateRoomSettingsOverlay(Room)
-                                    }
                                 },
                             },
-                        },
-                        // Footer
-                        new Drawable[]
-                        {
-                            new Container
+                            // Footer
+                            new Drawable[]
                             {
-                                RelativeSizeAxes = Axes.Both,
-                                Children = new Drawable[]
+                                new Container
                                 {
-                                    new Box
+                                    RelativeSizeAxes = Axes.Both,
+                                    Children = new Drawable[]
                                     {
-                                        RelativeSizeAxes = Axes.Both,
-                                        Colour = Color4Extensions.FromHex(@"28242d") // Temporary.
-                                    },
-                                    new Container
-                                    {
-                                        RelativeSizeAxes = Axes.Both,
-                                        Padding = new MarginPadding(5),
-                                        Child = CreateFooter()
-                                    },
+                                        new Box
+                                        {
+                                            RelativeSizeAxes = Axes.Both,
+                                            Colour = Color4Extensions.FromHex(@"28242d") // Temporary.
+                                        },
+                                        new Container
+                                        {
+                                            RelativeSizeAxes = Axes.Both,
+                                            Padding = new MarginPadding(5),
+                                            Child = CreateFooter()
+                                        },
+                                    }
                                 }
                             }
                         }

osu.Game/Screens/OnlinePlay/Multiplayer/Match/MatchStartControl.cs

@@ -0,0 +1,224 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using JetBrains.Annotations;
+using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Threading;
+using osu.Game.Online.Multiplayer;
+using osu.Game.Online.Multiplayer.Countdown;
+using osuTK;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
+{
+    public class MatchStartControl : MultiplayerRoomComposite
+    {
+        [Resolved]
+        private OngoingOperationTracker ongoingOperationTracker { get; set; }
+
+        [CanBeNull]
+        private IDisposable clickOperation;
+
+        private Sample sampleReady;
+        private Sample sampleReadyAll;
+        private Sample sampleUnready;
+
+        private readonly BindableBool enabled = new BindableBool();
+        private readonly MultiplayerCountdownButton countdownButton;
+        private int countReady;
+        private ScheduledDelegate readySampleDelegate;
+        private IBindable<bool> operationInProgress;
+
+        public MatchStartControl()
+        {
+            InternalChild = new GridContainer
+            {
+                RelativeSizeAxes = Axes.Both,
+                ColumnDimensions = new[]
+                {
+                    new Dimension(),
+                    new Dimension(GridSizeMode.AutoSize)
+                },
+                Content = new[]
+                {
+                    new Drawable[]
+                    {
+                        new MultiplayerReadyButton
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Size = Vector2.One,
+                            Action = onReadyClick,
+                            Enabled = { BindTarget = enabled },
+                        },
+                        countdownButton = new MultiplayerCountdownButton
+                        {
+                            RelativeSizeAxes = Axes.Y,
+                            Size = new Vector2(40, 1),
+                            Alpha = 0,
+                            Action = startCountdown,
+                            Enabled = { BindTarget = enabled }
+                        }
+                    }
+                }
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(AudioManager audio)
+        {
+            operationInProgress = ongoingOperationTracker.InProgress.GetBoundCopy();
+            operationInProgress.BindValueChanged(_ => updateState());
+
+            sampleReady = audio.Samples.Get(@"Multiplayer/player-ready");
+            sampleReadyAll = audio.Samples.Get(@"Multiplayer/player-ready-all");
+            sampleUnready = audio.Samples.Get(@"Multiplayer/player-unready");
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            CurrentPlaylistItem.BindValueChanged(_ => updateState());
+        }
+
+        protected override void OnRoomUpdated()
+        {
+            base.OnRoomUpdated();
+            updateState();
+        }
+
+        protected override void OnRoomLoadRequested()
+        {
+            base.OnRoomLoadRequested();
+            endOperation();
+        }
+
+        private void onReadyClick()
+        {
+            if (Room == null)
+                return;
+
+            Debug.Assert(clickOperation == null);
+            clickOperation = ongoingOperationTracker.BeginOperation();
+
+            // Ensure the current user becomes ready before being able to do anything else (start match, stop countdown, unready).
+            if (!isReady() || !Client.IsHost)
+            {
+                toggleReady();
+                return;
+            }
+
+            // Local user is the room host and is in a ready state.
+            // The only action they can take is to stop a countdown if one's currently running.
+            if (Room.Countdown != null)
+            {
+                stopCountdown();
+                return;
+            }
+
+            // And if a countdown isn't running, start the match.
+            startMatch();
+
+            bool isReady() => Client.LocalUser?.State == MultiplayerUserState.Ready || Client.LocalUser?.State == MultiplayerUserState.Spectating;
+
+            void toggleReady() => Client.ToggleReady().ContinueWith(_ => endOperation());
+
+            void stopCountdown() => Client.SendMatchRequest(new StopCountdownRequest()).ContinueWith(_ => endOperation());
+
+            void startMatch() => Client.StartMatch().ContinueWith(t =>
+            {
+                // accessing Exception here silences any potential errors from the antecedent task
+                if (t.Exception != null)
+                {
+                    // gameplay was not started due to an exception; unblock button.
+                    endOperation();
+                }
+
+                // gameplay is starting, the button will be unblocked on load requested.
+            });
+        }
+
+        private void startCountdown(TimeSpan duration)
+        {
+            Debug.Assert(clickOperation == null);
+            clickOperation = ongoingOperationTracker.BeginOperation();
+
+            Client.SendMatchRequest(new StartMatchCountdownRequest { Duration = duration }).ContinueWith(_ => endOperation());
+        }
+
+        private void endOperation()
+        {
+            clickOperation?.Dispose();
+            clickOperation = null;
+        }
+
+        private void updateState()
+        {
+            if (Room == null)
+            {
+                enabled.Value = false;
+                return;
+            }
+
+            var localUser = Client.LocalUser;
+
+            int newCountReady = Room.Users.Count(u => u.State == MultiplayerUserState.Ready);
+            int newCountTotal = Room.Users.Count(u => u.State != MultiplayerUserState.Spectating);
+
+            if (Room.Countdown != null)
+                countdownButton.Alpha = 0;
+            else
+            {
+                switch (localUser?.State)
+                {
+                    default:
+                        countdownButton.Alpha = 0;
+                        break;
+
+                    case MultiplayerUserState.Spectating:
+                    case MultiplayerUserState.Ready:
+                        countdownButton.Alpha = Room.Host?.Equals(localUser) == true ? 1 : 0;
+                        break;
+                }
+            }
+
+            enabled.Value =
+                Room.State == MultiplayerRoomState.Open
+                && CurrentPlaylistItem.Value?.ID == Room.Settings.PlaylistItemId
+                && !Room.Playlist.Single(i => i.ID == Room.Settings.PlaylistItemId).Expired
+                && !operationInProgress.Value;
+
+            // When the local user is the host and spectating the match, the "start match" state should be enabled if any users are ready.
+            if (localUser?.State == MultiplayerUserState.Spectating)
+                enabled.Value &= Room.Host?.Equals(localUser) == true && newCountReady > 0;
+
+            if (newCountReady == countReady)
+                return;
+
+            readySampleDelegate?.Cancel();
+            readySampleDelegate = Schedule(() =>
+            {
+                if (newCountReady > countReady)
+                {
+                    if (newCountReady == newCountTotal)
+                        sampleReadyAll?.Play();
+                    else
+                        sampleReady?.Play();
+                }
+                else if (newCountReady < countReady)
+                {
+                    sampleUnready?.Play();
+                }
+
+                countReady = newCountReady;
+            });
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Multiplayer/Match/MultiplayerCountdownButton.cs

@@ -0,0 +1,83 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using Humanizer;
+using osu.Framework.Allocation;
+using osu.Framework.Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Cursor;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.UserInterface;
+using osu.Game.Graphics;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Graphics.UserInterfaceV2;
+using osuTK;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
+{
+    public class MultiplayerCountdownButton : IconButton, IHasPopover
+    {
+        private static readonly TimeSpan[] available_delays =
+        {
+            TimeSpan.FromSeconds(10),
+            TimeSpan.FromSeconds(30),
+            TimeSpan.FromMinutes(1),
+            TimeSpan.FromMinutes(2)
+        };
+
+        public new Action<TimeSpan> Action;
+
+        private readonly Drawable background;
+
+        public MultiplayerCountdownButton()
+        {
+            Icon = FontAwesome.Solid.CaretDown;
+            IconScale = new Vector2(0.6f);
+
+            Add(background = new Box
+            {
+                RelativeSizeAxes = Axes.Both,
+                Depth = float.MaxValue
+            });
+
+            base.Action = this.ShowPopover;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            background.Colour = colours.Green;
+        }
+
+        public Popover GetPopover()
+        {
+            var flow = new FillFlowContainer
+            {
+                Width = 200,
+                AutoSizeAxes = Axes.Y,
+                Direction = FillDirection.Vertical,
+                Spacing = new Vector2(2),
+            };
+
+            foreach (var duration in available_delays)
+            {
+                flow.Add(new OsuButton
+                {
+                    RelativeSizeAxes = Axes.X,
+                    Text = $"Start match in {duration.Humanize()}",
+                    BackgroundColour = background.Colour,
+                    Action = () =>
+                    {
+                        Action(duration);
+                        this.HidePopover();
+                    }
+                });
+            }
+
+            return new OsuPopover { Child = flow };
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Multiplayer/Match/MultiplayerMatchFooter.cs

@@ -1,7 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 
@@ -12,19 +11,6 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
         private const float ready_button_width = 600;
         private const float spectate_button_width = 200;
 
-        public Action OnReadyClick
-        {
-            set => readyButton.OnReadyClick = value;
-        }
-
-        public Action OnSpectateClick
-        {
-            set => spectateButton.OnSpectateClick = value;
-        }
-
-        private readonly MultiplayerReadyButton readyButton;
-        private readonly MultiplayerSpectateButton spectateButton;
-
         public MultiplayerMatchFooter()
         {
             RelativeSizeAxes = Axes.Both;
@@ -37,12 +23,12 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
                     new Drawable[]
                     {
                         null,
-                        spectateButton = new MultiplayerSpectateButton
+                        new MultiplayerSpectateButton
                         {
                             RelativeSizeAxes = Axes.Both,
                         },
                         null,
-                        readyButton = new MultiplayerReadyButton
+                        new MatchStartControl
                         {
                             RelativeSizeAxes = Axes.Both,
                         },

osu.Game/Screens/OnlinePlay/Multiplayer/Match/MultiplayerReadyButton.cs

@@ -3,165 +3,176 @@
 
 using System;
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
-using osu.Framework.Audio;
-using osu.Framework.Audio.Sample;
-using osu.Framework.Bindables;
-using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Framework.Threading;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Backgrounds;
 using osu.Game.Online.Multiplayer;
 using osu.Game.Screens.OnlinePlay.Components;
-using osuTK;
 
 namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
 {
-    public class MultiplayerReadyButton : MultiplayerRoomComposite
+    public class MultiplayerReadyButton : ReadyButton
     {
-        public Action OnReadyClick
-        {
-            set => button.Action = value;
-        }
+        public new Triangles Triangles => base.Triangles;
+
+        [Resolved]
+        private MultiplayerClient multiplayerClient { get; set; }
 
         [Resolved]
         private OsuColour colours { get; set; }
 
-        [Resolved]
-        private OngoingOperationTracker ongoingOperationTracker { get; set; }
-
-        private IBindable<bool> operationInProgress;
-
-        private Sample sampleReady;
-        private Sample sampleReadyAll;
-        private Sample sampleUnready;
-
-        private readonly ButtonWithTrianglesExposed button;
-
-        private int countReady;
-
-        private ScheduledDelegate readySampleDelegate;
-
-        public MultiplayerReadyButton()
-        {
-            InternalChild = button = new ButtonWithTrianglesExposed
-            {
-                RelativeSizeAxes = Axes.Both,
-                Size = Vector2.One,
-                Enabled = { Value = true },
-            };
-        }
-
-        [BackgroundDependencyLoader]
-        private void load(AudioManager audio)
-        {
-            operationInProgress = ongoingOperationTracker.InProgress.GetBoundCopy();
-            operationInProgress.BindValueChanged(_ => updateState());
-
-            sampleReady = audio.Samples.Get(@"Multiplayer/player-ready");
-            sampleReadyAll = audio.Samples.Get(@"Multiplayer/player-ready-all");
-            sampleUnready = audio.Samples.Get(@"Multiplayer/player-unready");
-        }
+        [CanBeNull]
+        private MultiplayerRoom room => multiplayerClient.Room;
 
         protected override void LoadComplete()
         {
             base.LoadComplete();
 
-            CurrentPlaylistItem.BindValueChanged(_ => updateState());
+            multiplayerClient.RoomUpdated += onRoomUpdated;
+            onRoomUpdated();
         }
 
-        protected override void OnRoomUpdated()
-        {
-            base.OnRoomUpdated();
+        private MultiplayerCountdown countdown;
+        private DateTimeOffset countdownReceivedTime;
+        private ScheduledDelegate countdownUpdateDelegate;
 
-            updateState();
+        private void onRoomUpdated() => Scheduler.AddOnce(() =>
+        {
+            if (countdown == null && room?.Countdown != null)
+                countdownReceivedTime = DateTimeOffset.Now;
+
+            countdown = room?.Countdown;
+
+            if (room?.Countdown != null)
+                countdownUpdateDelegate ??= Scheduler.AddDelayed(updateButtonText, 1000, true);
+            else
+            {
+                countdownUpdateDelegate?.Cancel();
+                countdownUpdateDelegate = null;
+            }
+
+            updateButtonText();
+            updateButtonColour();
+        });
+
+        private void updateButtonText()
+        {
+            if (room == null)
+            {
+                Text = "Ready";
+                return;
+            }
+
+            var localUser = multiplayerClient.LocalUser;
+
+            int countReady = room.Users.Count(u => u.State == MultiplayerUserState.Ready);
+            int countTotal = room.Users.Count(u => u.State != MultiplayerUserState.Spectating);
+            string countText = $"({countReady} / {countTotal} ready)";
+
+            if (countdown != null)
+            {
+                TimeSpan timeElapsed = DateTimeOffset.Now - countdownReceivedTime;
+                TimeSpan countdownRemaining;
+
+                if (timeElapsed > countdown.TimeRemaining)
+                    countdownRemaining = TimeSpan.Zero;
+                else
+                    countdownRemaining = countdown.TimeRemaining - timeElapsed;
+
+                string countdownText = $"Starting in {countdownRemaining:mm\\:ss}";
+
+                switch (localUser?.State)
+                {
+                    default:
+                        Text = $"Ready ({countdownText.ToLowerInvariant()})";
+                        break;
+
+                    case MultiplayerUserState.Spectating:
+                    case MultiplayerUserState.Ready:
+                        Text = $"{countdownText} {countText}";
+                        break;
+                }
+            }
+            else
+            {
+                switch (localUser?.State)
+                {
+                    default:
+                        Text = "Ready";
+                        break;
+
+                    case MultiplayerUserState.Spectating:
+                    case MultiplayerUserState.Ready:
+                        Text = room.Host?.Equals(localUser) == true
+                            ? $"Start match {countText}"
+                            : $"Waiting for host... {countText}";
+
+                        break;
+                }
+            }
         }
 
-        private void updateState()
+        private void updateButtonColour()
         {
-            var localUser = Client.LocalUser;
+            if (room == null)
+            {
+                setGreen();
+                return;
+            }
 
-            int newCountReady = Room?.Users.Count(u => u.State == MultiplayerUserState.Ready) ?? 0;
-            int newCountTotal = Room?.Users.Count(u => u.State != MultiplayerUserState.Spectating) ?? 0;
+            var localUser = multiplayerClient.LocalUser;
 
             switch (localUser?.State)
             {
                 default:
-                    button.Text = "Ready";
-                    updateButtonColour(true);
+                    setGreen();
                     break;
 
                 case MultiplayerUserState.Spectating:
                 case MultiplayerUserState.Ready:
-                    string countText = $"({newCountReady} / {newCountTotal} ready)";
-
-                    if (Room?.Host?.Equals(localUser) == true)
-                    {
-                        button.Text = $"Start match {countText}";
-                        updateButtonColour(true);
-                    }
+                    if (room?.Host?.Equals(localUser) == true && room.Countdown == null)
+                        setGreen();
                     else
-                    {
-                        button.Text = $"Waiting for host... {countText}";
-                        updateButtonColour(false);
-                    }
+                        setYellow();
 
                     break;
             }
 
-            bool enableButton =
-                Room?.State == MultiplayerRoomState.Open
-                && CurrentPlaylistItem.Value?.ID == Room.Settings.PlaylistItemId
-                && !Room.Playlist.Single(i => i.ID == Room.Settings.PlaylistItemId).Expired
-                && !operationInProgress.Value;
-
-            // When the local user is the host and spectating the match, the "start match" state should be enabled if any users are ready.
-            if (localUser?.State == MultiplayerUserState.Spectating)
-                enableButton &= Room?.Host?.Equals(localUser) == true && newCountReady > 0;
-
-            button.Enabled.Value = enableButton;
-
-            if (newCountReady == countReady)
-                return;
-
-            readySampleDelegate?.Cancel();
-            readySampleDelegate = Schedule(() =>
+            void setYellow()
             {
-                if (newCountReady > countReady)
-                {
-                    if (newCountReady == newCountTotal)
-                        sampleReadyAll?.Play();
-                    else
-                        sampleReady?.Play();
-                }
-                else if (newCountReady < countReady)
-                {
-                    sampleUnready?.Play();
-                }
-
-                countReady = newCountReady;
-            });
-        }
-
-        private void updateButtonColour(bool green)
-        {
-            if (green)
-            {
-                button.BackgroundColour = colours.Green;
-                button.Triangles.ColourDark = colours.Green;
-                button.Triangles.ColourLight = colours.GreenLight;
+                BackgroundColour = colours.YellowDark;
+                Triangles.ColourDark = colours.YellowDark;
+                Triangles.ColourLight = colours.Yellow;
             }
-            else
+
+            void setGreen()
             {
-                button.BackgroundColour = colours.YellowDark;
-                button.Triangles.ColourDark = colours.YellowDark;
-                button.Triangles.ColourLight = colours.Yellow;
+                BackgroundColour = colours.Green;
+                Triangles.ColourDark = colours.Green;
+                Triangles.ColourLight = colours.GreenLight;
             }
         }
 
-        private class ButtonWithTrianglesExposed : ReadyButton
+        protected override void Dispose(bool isDisposing)
         {
-            public new Triangles Triangles => base.Triangles;
+            base.Dispose(isDisposing);
+
+            if (multiplayerClient != null)
+                multiplayerClient.RoomUpdated -= onRoomUpdated;
+        }
+
+        public override LocalisableString TooltipText
+        {
+            get
+            {
+                if (room?.Countdown != null && multiplayerClient.IsHost && multiplayerClient.LocalUser?.State == MultiplayerUserState.Ready)
+                    return "Cancel countdown";
+
+                return base.TooltipText;
+            }
         }
     }
 }

osu.Game/Screens/OnlinePlay/Multiplayer/Match/MultiplayerSpectateButton.cs

@@ -1,7 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
@@ -15,11 +14,6 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
 {
     public class MultiplayerSpectateButton : MultiplayerRoomComposite
     {
-        public Action OnSpectateClick
-        {
-            set => button.Action = value;
-        }
-
         [Resolved]
         private OngoingOperationTracker ongoingOperationTracker { get; set; }
 
@@ -37,9 +31,19 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match
                 RelativeSizeAxes = Axes.Both,
                 Size = Vector2.One,
                 Enabled = { Value = true },
+                Action = onClick
             };
         }
 
+        private void onClick()
+        {
+            var clickOperation = ongoingOperationTracker.BeginOperation();
+
+            Client.ToggleSpectate().ContinueWith(t => endOperation());
+
+            void endOperation() => clickOperation?.Dispose();
+        }
+
         [BackgroundDependencyLoader]
         private void load()
         {

osu.Game/Screens/OnlinePlay/Multiplayer/Match/Playlist/MultiplayerPlaylist.cs

@@ -7,7 +7,6 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.Multiplayer;
 using osu.Game.Online.Rooms;
 
@@ -25,6 +24,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match.Playlist
         /// </summary>
         public Action<PlaylistItem> RequestEdit;
 
+        private MultiplayerPlaylistTabControl playlistTabControl;
         private MultiplayerQueueList queueList;
         private MultiplayerHistoryList historyList;
         private bool firstPopulation = true;
@@ -36,7 +36,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match.Playlist
 
             InternalChildren = new Drawable[]
             {
-                new OsuTabControl<MultiplayerPlaylistDisplayMode>
+                playlistTabControl = new MultiplayerPlaylistTabControl
                 {
                     RelativeSizeAxes = Axes.X,
                     Height = tab_control_height,
@@ -64,6 +64,8 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match.Playlist
                     }
                 }
             };
+
+            playlistTabControl.QueueItems.BindTarget = queueList.Items;
         }
 
         protected override void LoadComplete()

osu.Game/Screens/OnlinePlay/Multiplayer/Match/Playlist/MultiplayerPlaylistTabControl.cs

@@ -0,0 +1,39 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Bindables;
+using osu.Framework.Graphics.UserInterface;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Online.Rooms;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Match.Playlist
+{
+    public class MultiplayerPlaylistTabControl : OsuTabControl<MultiplayerPlaylistDisplayMode>
+    {
+        public readonly IBindableList<PlaylistItem> QueueItems = new BindableList<PlaylistItem>();
+
+        protected override TabItem<MultiplayerPlaylistDisplayMode> CreateTabItem(MultiplayerPlaylistDisplayMode value)
+        {
+            if (value == MultiplayerPlaylistDisplayMode.Queue)
+                return new QueueTabItem { QueueItems = { BindTarget = QueueItems } };
+
+            return base.CreateTabItem(value);
+        }
+
+        private class QueueTabItem : OsuTabItem
+        {
+            public readonly IBindableList<PlaylistItem> QueueItems = new BindableList<PlaylistItem>();
+
+            public QueueTabItem()
+                : base(MultiplayerPlaylistDisplayMode.Queue)
+            {
+            }
+
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
+                QueueItems.BindCollectionChanged((_, __) => Text.Text = QueueItems.Count > 0 ? $"Queue ({QueueItems.Count})" : "Queue", true);
+            }
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs

@@ -1,11 +1,9 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using JetBrains.Annotations;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
@@ -46,14 +44,8 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
         [Resolved]
         private MultiplayerClient client { get; set; }
 
-        [Resolved]
-        private OngoingOperationTracker ongoingOperationTracker { get; set; }
-
         private readonly IBindable<bool> isConnected = new Bindable<bool>();
 
-        [CanBeNull]
-        private IDisposable readyClickOperation;
-
         private AddItemButton addItemButton;
 
         public MultiplayerMatchSubScreen(Room room)
@@ -230,11 +222,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
             this.Push(new MultiplayerMatchSongSelect(Room, itemToEdit));
         }
 
-        protected override Drawable CreateFooter() => new MultiplayerMatchFooter
-        {
-            OnReadyClick = onReadyClick,
-            OnSpectateClick = onSpectateClick
-        };
+        protected override Drawable CreateFooter() => new MultiplayerMatchFooter();
 
         protected override RoomSettingsOverlay CreateRoomSettingsOverlay(Room room) => new MultiplayerMatchSettingsOverlay(room);
 
@@ -332,52 +320,6 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
             }
         }
 
-        private void onReadyClick()
-        {
-            Debug.Assert(readyClickOperation == null);
-            readyClickOperation = ongoingOperationTracker.BeginOperation();
-
-            if (client.IsHost && (client.LocalUser?.State == MultiplayerUserState.Ready || client.LocalUser?.State == MultiplayerUserState.Spectating))
-            {
-                client.StartMatch()
-                      .ContinueWith(t =>
-                      {
-                          // accessing Exception here silences any potential errors from the antecedent task
-                          if (t.Exception != null)
-                          {
-                              // gameplay was not started due to an exception; unblock button.
-                              endOperation();
-                          }
-
-                          // gameplay is starting, the button will be unblocked on load requested.
-                      });
-                return;
-            }
-
-            client.ToggleReady()
-                  .ContinueWith(t => endOperation());
-
-            void endOperation()
-            {
-                readyClickOperation?.Dispose();
-                readyClickOperation = null;
-            }
-        }
-
-        private void onSpectateClick()
-        {
-            Debug.Assert(readyClickOperation == null);
-            readyClickOperation = ongoingOperationTracker.BeginOperation();
-
-            client.ToggleSpectate().ContinueWith(t => endOperation());
-
-            void endOperation()
-            {
-                readyClickOperation?.Dispose();
-                readyClickOperation = null;
-            }
-        }
-
         private void onRoomUpdated()
         {
             // may happen if the client is kicked or otherwise removed from the room.
@@ -433,9 +375,6 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
                 return;
 
             StartPlay();
-
-            readyClickOperation?.Dispose();
-            readyClickOperation = null;
         }
 
         protected override Screen CreateGameplayScreen()

osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerRoomComposite.cs

@@ -21,6 +21,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
             base.LoadComplete();
 
             Client.RoomUpdated += invokeOnRoomUpdated;
+            Client.LoadRequested += invokeOnRoomLoadRequested;
             Client.UserLeft += invokeUserLeft;
             Client.UserKicked += invokeUserKicked;
             Client.UserJoined += invokeUserJoined;
@@ -38,6 +39,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
         private void invokeItemAdded(MultiplayerPlaylistItem item) => Schedule(() => PlaylistItemAdded(item));
         private void invokeItemRemoved(long item) => Schedule(() => PlaylistItemRemoved(item));
         private void invokeItemChanged(MultiplayerPlaylistItem item) => Schedule(() => PlaylistItemChanged(item));
+        private void invokeOnRoomLoadRequested() => Scheduler.AddOnce(OnRoomLoadRequested);
 
         /// <summary>
         /// Invoked when a user has joined the room.
@@ -94,6 +96,13 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
         {
         }
 
+        /// <summary>
+        /// Invoked when the room requests the local user to load into gameplay.
+        /// </summary>
+        protected virtual void OnRoomLoadRequested()
+        {
+        }
+
         protected override void Dispose(bool isDisposing)
         {
             if (Client != null)

osu.Game/Screens/OnlinePlay/Multiplayer/Participants/ParticipantPanel.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions.Color4Extensions;
@@ -187,9 +186,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
             const double fade_time = 50;
 
             var currentItem = Playlist.GetCurrentItem();
-            Debug.Assert(currentItem != null);
-
-            var ruleset = rulesets.GetRuleset(currentItem.RulesetID)?.CreateInstance();
+            var ruleset = currentItem != null ? rulesets.GetRuleset(currentItem.RulesetID)?.CreateInstance() : null;
 
             int? currentModeRank = ruleset != null ? User.User?.RulesetsStatistics?.GetValueOrDefault(ruleset.ShortName)?.GlobalRank : null;
             userRankText.Text = currentModeRank != null ? $"#{currentModeRank.Value:N0}" : string.Empty;
@@ -201,15 +198,8 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
             else
                 userModsDisplay.FadeOut(fade_time);
 
-            if (Client.IsHost && !User.Equals(Client.LocalUser))
-                kickButton.FadeIn(fade_time);
-            else
-                kickButton.FadeOut(fade_time);
-
-            if (Room.Host?.Equals(User) == true)
-                crown.FadeIn(fade_time);
-            else
-                crown.FadeOut(fade_time);
+            kickButton.Alpha = Client.IsHost && !User.Equals(Client.LocalUser) ? 1 : 0;
+            crown.Alpha = Room.Host?.Equals(User) == true ? 1 : 0;
 
             // If the mods are updated at the end of the frame, the flow container will skip a reflow cycle: https://github.com/ppy/osu-framework/issues/4187
             // This looks particularly jarring here, so re-schedule the update to that start of our frame as a fix.

osu.Game/Screens/OnlinePlay/Multiplayer/Participants/ParticipantsList.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -15,6 +16,9 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
     {
         private FillFlowContainer<ParticipantPanel> panels;
 
+        [CanBeNull]
+        private ParticipantPanel currentHostPanel;
+
         [BackgroundDependencyLoader]
         private void load()
         {
@@ -55,6 +59,24 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
                 // Add panels for all users new to the room.
                 foreach (var user in Room.Users.Except(panels.Select(p => p.User)))
                     panels.Add(new ParticipantPanel(user));
+
+                if (currentHostPanel == null || !currentHostPanel.User.Equals(Room.Host))
+                {
+                    // Reset position of previous host back to normal, if one existing.
+                    if (currentHostPanel != null && panels.Contains(currentHostPanel))
+                        panels.SetLayoutPosition(currentHostPanel, 0);
+
+                    currentHostPanel = null;
+
+                    // Change position of new host to display above all participants.
+                    if (Room.Host != null)
+                    {
+                        currentHostPanel = panels.SingleOrDefault(u => u.User.Equals(Room.Host));
+
+                        if (currentHostPanel != null)
+                            panels.SetLayoutPosition(currentHostPanel, -1);
+                    }
+                }
             }
         }
     }

osu.Game/Screens/OnlinePlay/OnlinePlayScreen.cs

@@ -115,6 +115,8 @@ namespace osu.Game.Screens.OnlinePlay
             this.FadeIn();
             waves.Show();
 
+            Mods.SetDefault();
+
             if (loungeSubScreen.IsCurrentScreen())
                 loungeSubScreen.OnEntering(last);
             else

osu.Game/Screens/Play/HUD/HitErrorMeters/BarHitErrorMeter.cs

@@ -4,12 +4,16 @@
 using System;
 using System.Linq;
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Colour;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
+using osu.Game.Configuration;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets.Judgements;
 using osu.Game.Rulesets.Scoring;
 using osuTK;
@@ -19,11 +23,27 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
     public class BarHitErrorMeter : HitErrorMeter
     {
         private const int judgement_line_width = 14;
-        private const int judgement_line_height = 4;
+
+        [SettingSource("Judgement line thickness", "How thick the individual lines should be.")]
+        public BindableNumber<float> JudgementLineThickness { get; } = new BindableNumber<float>(4)
+        {
+            MinValue = 1,
+            MaxValue = 8,
+            Precision = 0.1f,
+        };
+
+        [SettingSource("Show moving average arrow", "Whether an arrow should move beneath the bar showing the average error.")]
+        public Bindable<bool> ShowMovingAverage { get; } = new BindableBool(true);
+
+        [SettingSource("Centre marker style", "How to signify the centre of the display")]
+        public Bindable<CentreMarkerStyles> CentreMarkerStyle { get; } = new Bindable<CentreMarkerStyles>(CentreMarkerStyles.Circle);
+
+        [SettingSource("Label style", "How to show early/late extremities")]
+        public Bindable<LabelStyles> LabelStyle { get; } = new Bindable<LabelStyles>(LabelStyles.Icons);
 
         private SpriteIcon arrow;
-        private SpriteIcon iconEarly;
-        private SpriteIcon iconLate;
+        private Drawable labelEarly;
+        private Drawable labelLate;
 
         private Container colourBarsEarly;
         private Container colourBarsLate;
@@ -32,6 +52,18 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
 
         private double maxHitWindow;
 
+        private double floatingAverage;
+        private Container colourBars;
+        private Container arrowContainer;
+
+        private (HitResult result, double length)[] hitWindows;
+
+        private const int max_concurrent_judgements = 50;
+
+        private Drawable[] centreMarkerDrawables;
+
+        private const int centre_marker_size = 8;
+
         public BarHitErrorMeter()
         {
             AutoSizeAxes = Axes.Both;
@@ -40,13 +72,11 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
         [BackgroundDependencyLoader]
         private void load()
         {
-            const int centre_marker_size = 8;
             const int bar_height = 200;
             const int bar_width = 2;
             const float chevron_size = 8;
-            const float icon_size = 14;
 
-            var hitWindows = HitWindows.GetAllAvailableWindows().ToArray();
+            hitWindows = HitWindows.GetAllAvailableWindows().ToArray();
 
             InternalChild = new Container
             {
@@ -65,22 +95,6 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
                         RelativeSizeAxes = Axes.Y,
                         Children = new Drawable[]
                         {
-                            iconEarly = new SpriteIcon
-                            {
-                                Y = -10,
-                                Size = new Vector2(icon_size),
-                                Icon = FontAwesome.Solid.ShippingFast,
-                                Anchor = Anchor.TopCentre,
-                                Origin = Anchor.Centre,
-                            },
-                            iconLate = new SpriteIcon
-                            {
-                                Y = 10,
-                                Size = new Vector2(icon_size),
-                                Icon = FontAwesome.Solid.Bicycle,
-                                Anchor = Anchor.BottomCentre,
-                                Origin = Anchor.Centre,
-                            },
                             colourBarsEarly = new Container
                             {
                                 Anchor = Anchor.Centre,
@@ -98,14 +112,6 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
                                 RelativeSizeAxes = Axes.Y,
                                 Height = 0.5f,
                             },
-                            new Circle
-                            {
-                                Name = "middle marker behind",
-                                Colour = GetColourForHitResult(hitWindows.Last().result),
-                                Anchor = Anchor.Centre,
-                                Origin = Anchor.Centre,
-                                Size = new Vector2(centre_marker_size),
-                            },
                             judgementsContainer = new Container
                             {
                                 Name = "judgements",
@@ -114,24 +120,18 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
                                 RelativeSizeAxes = Axes.Y,
                                 Width = judgement_line_width,
                             },
-                            new Circle
-                            {
-                                Name = "middle marker in front",
-                                Colour = GetColourForHitResult(hitWindows.Last().result).Darken(0.3f),
-                                Anchor = Anchor.Centre,
-                                Origin = Anchor.Centre,
-                                Size = new Vector2(centre_marker_size),
-                                Scale = new Vector2(0.5f),
-                            },
                         }
                     },
-                    new Container
+                    arrowContainer = new Container
                     {
                         Name = "average chevron",
                         Anchor = Anchor.CentreLeft,
-                        Origin = Anchor.CentreLeft,
+                        Origin = Anchor.CentreRight,
                         Width = chevron_size,
+                        X = chevron_size,
                         RelativeSizeAxes = Axes.Y,
+                        Alpha = 0,
+                        Scale = new Vector2(0, 1),
                         Child = arrow = new SpriteIcon
                         {
                             Anchor = Anchor.TopCentre,
@@ -155,8 +155,180 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
             colourBars.Height = 0;
             colourBars.ResizeHeightTo(1, 800, Easing.OutQuint);
 
-            arrow.Alpha = 0;
-            arrow.Delay(200).FadeInFromZero(600);
+            CentreMarkerStyle.BindValueChanged(style => recreateCentreMarker(style.NewValue), true);
+            LabelStyle.BindValueChanged(style => recreateLabels(style.NewValue), true);
+
+            // delay the appearance animations for only the initial appearance.
+            using (arrowContainer.BeginDelayedSequence(450))
+            {
+                ShowMovingAverage.BindValueChanged(visible =>
+                {
+                    arrowContainer.FadeTo(visible.NewValue ? 1 : 0, 250, Easing.OutQuint);
+                    arrowContainer.ScaleTo(visible.NewValue ? new Vector2(1) : new Vector2(0, 1), 250, Easing.OutQuint);
+                }, true);
+            }
+        }
+
+        private void recreateCentreMarker(CentreMarkerStyles style)
+        {
+            if (centreMarkerDrawables != null)
+            {
+                foreach (var d in centreMarkerDrawables)
+                {
+                    d.ScaleTo(0, 500, Easing.OutQuint)
+                     .FadeOut(500, Easing.OutQuint);
+
+                    d.Expire();
+                }
+
+                centreMarkerDrawables = null;
+            }
+
+            switch (style)
+            {
+                case CentreMarkerStyles.None:
+                    break;
+
+                case CentreMarkerStyles.Circle:
+                    centreMarkerDrawables = new Drawable[]
+                    {
+                        new Circle
+                        {
+                            Name = "middle marker behind",
+                            Colour = GetColourForHitResult(hitWindows.Last().result),
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Depth = float.MaxValue,
+                            Size = new Vector2(centre_marker_size),
+                        },
+                        new Circle
+                        {
+                            Name = "middle marker in front",
+                            Colour = GetColourForHitResult(hitWindows.Last().result).Darken(0.3f),
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Depth = float.MinValue,
+                            Size = new Vector2(centre_marker_size / 2f),
+                        },
+                    };
+                    break;
+
+                case CentreMarkerStyles.Line:
+                    const float border_size = 1.5f;
+
+                    centreMarkerDrawables = new Drawable[]
+                    {
+                        new Box
+                        {
+                            Name = "middle marker behind",
+                            Colour = GetColourForHitResult(hitWindows.Last().result),
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Depth = float.MaxValue,
+                            Size = new Vector2(judgement_line_width, centre_marker_size / 3f),
+                        },
+                        new Box
+                        {
+                            Name = "middle marker in front",
+                            Colour = GetColourForHitResult(hitWindows.Last().result).Darken(0.3f),
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Depth = float.MinValue,
+                            Size = new Vector2(judgement_line_width - border_size, centre_marker_size / 3f - border_size),
+                        },
+                    };
+                    break;
+
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(style), style, null);
+            }
+
+            if (centreMarkerDrawables != null)
+            {
+                foreach (var d in centreMarkerDrawables)
+                {
+                    colourBars.Add(d);
+
+                    d.FadeInFromZero(500, Easing.OutQuint)
+                     .ScaleTo(0).ScaleTo(1, 1000, Easing.OutElasticHalf);
+                }
+            }
+        }
+
+        private void recreateLabels(LabelStyles style)
+        {
+            const float icon_size = 14;
+
+            labelEarly?.Expire();
+            labelEarly = null;
+
+            labelLate?.Expire();
+            labelLate = null;
+
+            switch (style)
+            {
+                case LabelStyles.None:
+                    break;
+
+                case LabelStyles.Icons:
+                    labelEarly = new SpriteIcon
+                    {
+                        Y = -10,
+                        Size = new Vector2(icon_size),
+                        Icon = FontAwesome.Solid.ShippingFast,
+                        Anchor = Anchor.TopCentre,
+                        Origin = Anchor.Centre,
+                    };
+
+                    labelLate = new SpriteIcon
+                    {
+                        Y = 10,
+                        Size = new Vector2(icon_size),
+                        Icon = FontAwesome.Solid.Bicycle,
+                        Anchor = Anchor.BottomCentre,
+                        Origin = Anchor.Centre,
+                    };
+
+                    break;
+
+                case LabelStyles.Text:
+                    labelEarly = new OsuSpriteText
+                    {
+                        Y = -10,
+                        Text = "Early",
+                        Font = OsuFont.Default.With(size: 10),
+                        Height = 12,
+                        Anchor = Anchor.TopCentre,
+                        Origin = Anchor.Centre,
+                    };
+
+                    labelLate = new OsuSpriteText
+                    {
+                        Y = 10,
+                        Text = "Late",
+                        Font = OsuFont.Default.With(size: 10),
+                        Height = 12,
+                        Anchor = Anchor.BottomCentre,
+                        Origin = Anchor.Centre,
+                    };
+
+                    break;
+
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(style), style, null);
+            }
+
+            if (labelEarly != null)
+            {
+                colourBars.Add(labelEarly);
+                labelEarly.FadeInFromZero(500);
+            }
+
+            if (labelLate != null)
+            {
+                colourBars.Add(labelLate);
+                labelLate.FadeInFromZero(500);
+            }
         }
 
         protected override void Update()
@@ -164,8 +336,8 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
             base.Update();
 
             // undo any layout rotation to display icons in the correct orientation
-            iconEarly.Rotation = -Rotation;
-            iconLate.Rotation = -Rotation;
+            if (labelEarly != null) labelEarly.Rotation = -Rotation;
+            if (labelLate != null) labelLate.Rotation = -Rotation;
         }
 
         private void createColourBars((HitResult result, double length)[] windows)
@@ -224,11 +396,6 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
             }
         }
 
-        private double floatingAverage;
-        private Container colourBars;
-
-        private const int max_concurrent_judgements = 50;
-
         protected override void OnNewJudgement(JudgementResult judgement)
         {
             const int arrow_move_duration = 800;
@@ -255,6 +422,7 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
 
             judgementsContainer.Add(new JudgementLine
             {
+                JudgementLineThickness = { BindTarget = JudgementLineThickness },
                 Y = getRelativeJudgementPosition(judgement.TimeOffset),
                 Colour = GetColourForHitResult(judgement.Type),
             });
@@ -268,11 +436,12 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
 
         internal class JudgementLine : CompositeDrawable
         {
+            public readonly BindableNumber<float> JudgementLineThickness = new BindableFloat();
+
             public JudgementLine()
             {
                 RelativeSizeAxes = Axes.X;
                 RelativePositionAxes = Axes.Y;
-                Height = judgement_line_height;
 
                 Blending = BlendingParameters.Additive;
 
@@ -295,6 +464,8 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
                 Alpha = 0;
                 Width = 0;
 
+                JudgementLineThickness.BindValueChanged(thickness => Height = thickness.NewValue, true);
+
                 this
                     .FadeTo(0.6f, judgement_fade_in_duration, Easing.OutQuint)
                     .ResizeWidthTo(1, judgement_fade_in_duration, Easing.OutQuint)
@@ -306,5 +477,19 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
         }
 
         public override void Clear() => judgementsContainer.Clear();
+
+        public enum CentreMarkerStyles
+        {
+            None,
+            Circle,
+            Line
+        }
+
+        public enum LabelStyles
+        {
+            None,
+            Icons,
+            Text
+        }
     }
 }

osu.Game/Screens/Play/HUD/HoldForMenuButton.cs

@@ -84,7 +84,7 @@ namespace osu.Game.Screens.Play.HUD
 
         protected override bool OnMouseMove(MouseMoveEvent e)
         {
-            positionalAdjust = Vector2.Distance(e.ScreenSpaceMousePosition, button.ScreenSpaceDrawQuad.Centre) / 200;
+            positionalAdjust = Vector2.Distance(e.MousePosition, button.ToSpaceOfOtherDrawable(button.DrawRectangle.Centre, Parent)) / 100;
             return base.OnMouseMove(e);
         }