Merge branch 'master' into refactor-framed-replay-input-hander

osu.Android.props

@@ -52,6 +52,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2021.412.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.410.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.415.0" />
   </ItemGroup>
 </Project>

osu.Android/OsuGameAndroid.cs

@@ -7,6 +7,8 @@ using Android.OS;
 using osu.Framework.Allocation;
 using osu.Game;
 using osu.Game.Updater;
+using osu.Game.Utils;
+using Xamarin.Essentials;
 
 namespace osu.Android
 {
@@ -72,5 +74,14 @@ namespace osu.Android
         }
 
         protected override UpdateManager CreateUpdateManager() => new SimpleUpdateManager();
+
+        protected override BatteryInfo CreateBatteryInfo() => new AndroidBatteryInfo();
+
+        private class AndroidBatteryInfo : BatteryInfo
+        {
+            public override double ChargeLevel => Battery.ChargeLevel;
+
+            public override bool IsCharging => Battery.PowerSource != BatteryPowerSource.Battery;
+        }
     }
 }

osu.Android/Properties/AndroidManifest.xml

@@ -6,5 +6,6 @@
 	<uses-permission android:name="android.permission.WAKE_LOCK" />
 	<uses-permission android:name="android.permission.READ_FRAME_BUFFER" />
 	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.BATTERY_STATS" />
 	<application android:allowBackup="true" android:supportsRtl="true" android:label="osu!" android:icon="@drawable/lazer" />
 </manifest>

osu.Android/osu.Android.csproj

@@ -63,5 +63,8 @@
       <Version>5.0.0</Version>
     </PackageReference>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
 </Project>

osu.Game.Rulesets.Mania/Mods/ManiaModMirror.cs

@@ -15,6 +15,7 @@ namespace osu.Game.Rulesets.Mania.Mods
         public override string Name => "Mirror";
         public override string Acronym => "MR";
         public override ModType Type => ModType.Conversion;
+        public override string Description => "Notes are flipped horizontally.";
         public override double ScoreMultiplier => 1;
         public override bool Ranked => true;
 

osu.Game.Rulesets.Osu.Tests/Editor/Checks/CheckOffscreenObjectsTest.cs

@@ -0,0 +1,260 @@
+// 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.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class CheckOffscreenObjectsTest
+    {
+        private static readonly Vector2 playfield_centre = OsuPlayfield.BASE_SIZE * 0.5f;
+
+        private CheckOffscreenObjects check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckOffscreenObjects();
+        }
+
+        [Test]
+        public void TestCircleInCenter()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre // Playfield is 640 x 480.
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestCircleNearEdge()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(5, 5)
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestCircleNearEdgeStackedOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(5, 5),
+                        StackHeight = 5
+                    }
+                }
+            };
+
+            assertOffscreenCircle(beatmap);
+        }
+
+        [Test]
+        public void TestCircleOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(0, 0)
+                    }
+                }
+            };
+
+            assertOffscreenCircle(beatmap);
+        }
+
+        [Test]
+        public void TestSliderInCenter()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(420, 240),
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(-100, 0))
+                        }),
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestSliderNearEdge()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(0, -playfield_centre.Y + 5))
+                        }),
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestSliderNearEdgeStackedOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(0, -playfield_centre.Y + 5))
+                        }),
+                        StackHeight = 5
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenStart()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(0, 0),
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(playfield_centre)
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenEnd()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(-playfield_centre)
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenPath()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            // Circular arc shoots over the top of the screen.
+                            new PathControlPoint(new Vector2(0, 0), PathType.PerfectCurve),
+                            new PathControlPoint(new Vector2(-100, -200)),
+                            new PathControlPoint(new Vector2(100, -200))
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        private void assertOffscreenCircle(IBeatmap beatmap)
+        {
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckOffscreenObjects.IssueTemplateOffscreenCircle);
+        }
+
+        private void assertOffscreenSlider(IBeatmap beatmap)
+        {
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckOffscreenObjects.IssueTemplateOffscreenSlider);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Editor/TestSceneOsuEditorSelectInvalidPath.cs

@@ -0,0 +1,46 @@
+// 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 osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor
+{
+    public class TestSceneOsuEditorSelectInvalidPath : EditorTestScene
+    {
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
+
+        [Test]
+        public void TestSelectDoesNotModify()
+        {
+            Slider slider = new Slider { StartTime = 0, Position = new Vector2(320, 40) };
+
+            PathControlPoint[] points =
+            {
+                new PathControlPoint(new Vector2(0), PathType.PerfectCurve),
+                new PathControlPoint(new Vector2(-100, 0)),
+                new PathControlPoint(new Vector2(100, 20))
+            };
+
+            int preSelectVersion = -1;
+            AddStep("add slider", () =>
+            {
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+                preSelectVersion = slider.Path.Version.Value;
+            });
+
+            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
+
+            AddAssert("slider same path", () => slider.Path.Version.Value == preSelectVersion);
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointPiece.cs

@@ -59,11 +59,14 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             this.slider = slider;
             ControlPoint = controlPoint;
 
+            // we don't want to run the path type update on construction as it may inadvertently change the slider.
+            cachePoints(slider);
+
             slider.Path.Version.BindValueChanged(_ =>
             {
-                PointsInSegment = slider.Path.PointsInSegment(ControlPoint);
+                cachePoints(slider);
                 updatePathType();
-            }, runOnceImmediately: true);
+            });
 
             controlPoint.Type.BindValueChanged(_ => updateMarkerDisplay());
 
@@ -205,6 +208,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 
         protected override void OnDragEnd(DragEndEvent e) => changeHandler?.EndChange();
 
+        private void cachePoints(Slider slider) => PointsInSegment = slider.Path.PointsInSegment(ControlPoint);
+
         /// <summary>
         /// Handles correction of invalid path types.
         /// </summary>

osu.Game.Rulesets.Osu/Edit/Checks/CheckOffscreenObjects.cs

@@ -0,0 +1,115 @@
+// 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.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Edit.Checks
+{
+    public class CheckOffscreenObjects : ICheck
+    {
+        // A close approximation for the bounding box of the screen in gameplay on 4:3 aspect ratio.
+        // Uses gameplay space coordinates (512 x 384 playfield / 640 x 480 screen area).
+        // See https://github.com/ppy/osu/pull/12361#discussion_r612199777 for reference.
+        private const int min_x = -67;
+        private const int min_y = -60;
+        private const int max_x = 579;
+        private const int max_y = 428;
+
+        // The amount of milliseconds to step through a slider path at a time
+        // (higher = more performant, but higher false-negative chance).
+        private const int path_step_size = 5;
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Offscreen hitobjects");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateOffscreenCircle(this),
+            new IssueTemplateOffscreenSlider(this)
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap)
+        {
+            foreach (var hitobject in beatmap.HitObjects)
+            {
+                switch (hitobject)
+                {
+                    case Slider slider:
+                    {
+                        foreach (var issue in sliderIssues(slider))
+                            yield return issue;
+
+                        break;
+                    }
+
+                    case HitCircle circle:
+                    {
+                        if (isOffscreen(circle.StackedPosition, circle.Radius))
+                            yield return new IssueTemplateOffscreenCircle(this).Create(circle);
+
+                        break;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Steps through points on the slider to ensure the entire path is on-screen.
+        /// Returns at most one issue.
+        /// </summary>
+        /// <param name="slider">The slider whose path to check.</param>
+        /// <returns></returns>
+        private IEnumerable<Issue> sliderIssues(Slider slider)
+        {
+            for (int i = 0; i < slider.Distance; i += path_step_size)
+            {
+                double progress = i / slider.Distance;
+                Vector2 position = slider.StackedPositionAt(progress);
+
+                if (!isOffscreen(position, slider.Radius))
+                    continue;
+
+                // `SpanDuration` ensures we don't include reverses.
+                double time = slider.StartTime + progress * slider.SpanDuration;
+                yield return new IssueTemplateOffscreenSlider(this).Create(slider, time);
+
+                yield break;
+            }
+
+            // Above loop may skip the last position in the slider due to step size.
+            if (!isOffscreen(slider.StackedEndPosition, slider.Radius))
+                yield break;
+
+            yield return new IssueTemplateOffscreenSlider(this).Create(slider, slider.EndTime);
+        }
+
+        private bool isOffscreen(Vector2 position, double radius)
+        {
+            return position.X - radius < min_x || position.X + radius > max_x ||
+                   position.Y - radius < min_y || position.Y + radius > max_y;
+        }
+
+        public class IssueTemplateOffscreenCircle : IssueTemplate
+        {
+            public IssueTemplateOffscreenCircle(ICheck check)
+                : base(check, IssueType.Problem, "This circle goes offscreen on a 4:3 aspect ratio.")
+            {
+            }
+
+            public Issue Create(HitCircle circle) => new Issue(circle, this);
+        }
+
+        public class IssueTemplateOffscreenSlider : IssueTemplate
+        {
+            public IssueTemplateOffscreenSlider(ICheck check)
+                : base(check, IssueType.Problem, "This slider goes offscreen here on a 4:3 aspect ratio.")
+            {
+            }
+
+            public Issue Create(Slider slider, double offscreenTime) => new Issue(slider, this) { Time = offscreenTime };
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/OsuBeatmapVerifier.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.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+
+namespace osu.Game.Rulesets.Osu.Edit
+{
+    public class OsuBeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckOffscreenObjects()
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap) => checks.SelectMany(check => check.Run(beatmap));
+    }
+}

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

@@ -9,6 +9,7 @@ namespace osu.Game.Rulesets.Osu.Mods
     {
         public override string Name => "Touch Device";
         public override string Acronym => "TD";
+        public override string Description => "Automatically applied to plays on devices with a touchscreen.";
         public override double ScoreMultiplier => 1;
 
         public override ModType Type => ModType.System;

osu.Game.Rulesets.Osu/OsuRuleset.cs

@@ -206,6 +206,8 @@ namespace osu.Game.Rulesets.Osu
 
         public override HitObjectComposer CreateHitObjectComposer() => new OsuHitObjectComposer(this);
 
+        public override IBeatmapVerifier CreateBeatmapVerifier() => new OsuBeatmapVerifier();
+
         public override string Description => "osu!";
 
         public override string ShortName => SHORT_NAME;

osu.Game.Tests/Editing/Checks/CheckBackgroundTest.cs

@@ -0,0 +1,67 @@
+// 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.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Tests.Editing.Checks
+{
+    [TestFixture]
+    public class CheckBackgroundTest
+    {
+        private CheckBackground check;
+        private IBeatmap beatmap;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckBackground();
+            beatmap = new Beatmap<HitObject>
+            {
+                BeatmapInfo = new BeatmapInfo
+                {
+                    Metadata = new BeatmapMetadata { BackgroundFile = "abc123.jpg" },
+                    BeatmapSet = new BeatmapSetInfo
+                    {
+                        Files = new List<BeatmapSetFileInfo>(new[]
+                        {
+                            new BeatmapSetFileInfo { Filename = "abc123.jpg" }
+                        })
+                    }
+                }
+            };
+        }
+
+        [Test]
+        public void TestBackgroundSetAndInFiles()
+        {
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestBackgroundSetAndNotInFiles()
+        {
+            beatmap.BeatmapInfo.BeatmapSet.Files.Clear();
+
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckBackground.IssueTemplateDoesNotExist);
+        }
+
+        [Test]
+        public void TestBackgroundNotSet()
+        {
+            beatmap.Metadata.BackgroundFile = null;
+
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckBackground.IssueTemplateNoneSet);
+        }
+    }
+}

osu.Game.Tests/Mods/ModSettingsEqualityComparison.cs

@@ -0,0 +1,36 @@
+// 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 osu.Game.Online.API;
+using osu.Game.Rulesets.Osu.Mods;
+
+namespace osu.Game.Tests.Mods
+{
+    [TestFixture]
+    public class ModSettingsEqualityComparison
+    {
+        [Test]
+        public void Test()
+        {
+            var mod1 = new OsuModDoubleTime { SpeedChange = { Value = 1.25 } };
+            var mod2 = new OsuModDoubleTime { SpeedChange = { Value = 1.26 } };
+            var mod3 = new OsuModDoubleTime { SpeedChange = { Value = 1.26 } };
+            var apiMod1 = new APIMod(mod1);
+            var apiMod2 = new APIMod(mod2);
+            var apiMod3 = new APIMod(mod3);
+
+            Assert.That(mod1, Is.Not.EqualTo(mod2));
+            Assert.That(apiMod1, Is.Not.EqualTo(apiMod2));
+
+            Assert.That(mod2, Is.EqualTo(mod2));
+            Assert.That(apiMod2, Is.EqualTo(apiMod2));
+
+            Assert.That(mod2, Is.EqualTo(mod3));
+            Assert.That(apiMod2, Is.EqualTo(apiMod3));
+
+            Assert.That(mod3, Is.EqualTo(mod2));
+            Assert.That(apiMod3, Is.EqualTo(apiMod2));
+        }
+    }
+}

osu.Game.Tests/NonVisual/DifficultyAdjustmentModCombinationsTest.cs

@@ -144,6 +144,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => nameof(ModA);
             public override string Acronym => nameof(ModA);
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModIncompatibleWithA), typeof(ModIncompatibleWithAAndB) };
@@ -152,6 +153,7 @@ namespace osu.Game.Tests.NonVisual
         private class ModB : Mod
         {
             public override string Name => nameof(ModB);
+            public override string Description => string.Empty;
             public override string Acronym => nameof(ModB);
             public override double ScoreMultiplier => 1;
 
@@ -162,6 +164,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => nameof(ModC);
             public override string Acronym => nameof(ModC);
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
         }
 
@@ -169,6 +172,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => $"Incompatible With {nameof(ModA)}";
             public override string Acronym => $"Incompatible With {nameof(ModA)}";
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModA) };
@@ -187,6 +191,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => $"Incompatible With {nameof(ModA)} and {nameof(ModB)}";
             public override string Acronym => $"Incompatible With {nameof(ModA)} and {nameof(ModB)}";
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModA), typeof(ModB) };

osu.Game.Tests/Online/TestAPIModJsonSerialization.cs

@@ -140,6 +140,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]
@@ -156,6 +157,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TMTR";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Initial rate", "The starting speed of the track")]

osu.Game.Tests/Online/TestAPIModMessagePackSerialization.cs

@@ -100,6 +100,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]
@@ -116,6 +117,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TMTR";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Initial rate", "The starting speed of the track")]
@@ -150,6 +152,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]

osu.Game.Tests/Visual/Background/TestSceneUserDimBackgrounds.cs

@@ -65,6 +65,21 @@ namespace osu.Game.Tests.Visual.Background
             stack.Push(songSelect = new DummySongSelect());
         });
 
+        /// <summary>
+        /// User settings should always be ignored on song select screen.
+        /// </summary>
+        [Test]
+        public void TestUserSettingsIgnoredOnSongSelect()
+        {
+            setupUserSettings();
+            AddUntilStep("Screen is undimmed", () => songSelect.IsBackgroundUndimmed());
+            AddUntilStep("Screen using background blur", () => songSelect.IsBackgroundBlur());
+            performFullSetup();
+            AddStep("Exit to song select", () => player.Exit());
+            AddUntilStep("Screen is undimmed", () => songSelect.IsBackgroundUndimmed());
+            AddUntilStep("Screen using background blur", () => songSelect.IsBackgroundBlur());
+        }
+
         /// <summary>
         /// Check if <see cref="PlayerLoader"/> properly triggers the visual settings preview when a user hovers over the visual settings panel.
         /// </summary>
@@ -142,9 +157,9 @@ namespace osu.Game.Tests.Visual.Background
         {
             performFullSetup();
             AddUntilStep("Screen is dimmed and blur applied", () => songSelect.IsBackgroundDimmed() && songSelect.IsUserBlurApplied());
-            AddStep("Enable user dim", () => songSelect.DimEnabled.Value = false);
+            AddStep("Disable user dim", () => songSelect.IgnoreUserSettings.Value = true);
             AddUntilStep("Screen is undimmed and user blur removed", () => songSelect.IsBackgroundUndimmed() && songSelect.IsUserBlurDisabled());
-            AddStep("Disable user dim", () => songSelect.DimEnabled.Value = true);
+            AddStep("Enable user dim", () => songSelect.IgnoreUserSettings.Value = false);
             AddUntilStep("Screen is dimmed and blur applied", () => songSelect.IsBackgroundDimmed() && songSelect.IsUserBlurApplied());
         }
 
@@ -161,13 +176,36 @@ namespace osu.Game.Tests.Visual.Background
                 player.ReplacesBackground.Value = true;
                 player.StoryboardEnabled.Value = true;
             });
-            AddStep("Enable user dim", () => player.DimmableStoryboard.EnableUserDim.Value = true);
+            AddStep("Enable user dim", () => player.DimmableStoryboard.IgnoreUserSettings.Value = false);
             AddStep("Set dim level to 1", () => songSelect.DimLevel.Value = 1f);
             AddUntilStep("Storyboard is invisible", () => !player.IsStoryboardVisible);
-            AddStep("Disable user dim", () => player.DimmableStoryboard.EnableUserDim.Value = false);
+            AddStep("Disable user dim", () => player.DimmableStoryboard.IgnoreUserSettings.Value = true);
             AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
         }
 
+        [Test]
+        public void TestStoryboardIgnoreUserSettings()
+        {
+            performFullSetup();
+            createFakeStoryboard();
+            AddStep("Enable replacing background", () => player.ReplacesBackground.Value = true);
+
+            AddUntilStep("Storyboard is invisible", () => !player.IsStoryboardVisible);
+            AddUntilStep("Background is visible", () => songSelect.IsBackgroundVisible());
+
+            AddStep("Ignore user settings", () =>
+            {
+                player.ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
+                player.DimmableStoryboard.IgnoreUserSettings.Value = true;
+            });
+            AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
+            AddUntilStep("Background is invisible", () => songSelect.IsBackgroundInvisible());
+
+            AddStep("Disable background replacement", () => player.ReplacesBackground.Value = false);
+            AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
+            AddUntilStep("Background is visible", () => songSelect.IsBackgroundVisible());
+        }
+
         /// <summary>
         /// Check if the visual settings container retains dim and blur when pausing
         /// </summary>
@@ -204,17 +242,6 @@ namespace osu.Game.Tests.Visual.Background
                 songSelect.IsBackgroundUndimmed() && songSelect.IsBackgroundCurrent() && songSelect.CheckBackgroundBlur(results.ExpectedBackgroundBlur));
         }
 
-        /// <summary>
-        /// Check if background gets undimmed and unblurred when leaving <see cref="Player"/>  for <see cref="PlaySongSelect"/>
-        /// </summary>
-        [Test]
-        public void TestTransitionOut()
-        {
-            performFullSetup();
-            AddStep("Exit to song select", () => player.Exit());
-            AddUntilStep("Screen is undimmed and user blur removed", () => songSelect.IsBackgroundUndimmed() && songSelect.IsBlurCorrect());
-        }
-
         /// <summary>
         /// Check if hovering on the visual settings dialogue after resuming from player still previews the background dim.
         /// </summary>
@@ -281,11 +308,11 @@ namespace osu.Game.Tests.Visual.Background
             protected override BackgroundScreen CreateBackground()
             {
                 background = new FadeAccessibleBackground(Beatmap.Value);
-                DimEnabled.BindTo(background.EnableUserDim);
+                IgnoreUserSettings.BindTo(background.IgnoreUserSettings);
                 return background;
             }
 
-            public readonly Bindable<bool> DimEnabled = new Bindable<bool>();
+            public readonly Bindable<bool> IgnoreUserSettings = new Bindable<bool>();
             public readonly Bindable<double> DimLevel = new BindableDouble();
             public readonly Bindable<double> BlurLevel = new BindableDouble();
 
@@ -310,7 +337,7 @@ namespace osu.Game.Tests.Visual.Background
 
             public bool IsBackgroundVisible() => background.CurrentAlpha == 1;
 
-            public bool IsBlurCorrect() => background.CurrentBlur == new Vector2(BACKGROUND_BLUR);
+            public bool IsBackgroundBlur() => background.CurrentBlur == new Vector2(BACKGROUND_BLUR);
 
             public bool CheckBackgroundBlur(Vector2 expected) => background.CurrentBlur == expected;
 

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

@@ -1,88 +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.Linq;
-using NUnit.Framework;
-using osu.Framework.Testing;
-using osu.Game.Beatmaps;
-using osu.Game.Rulesets;
-using osu.Game.Rulesets.Objects;
-using osu.Game.Rulesets.Osu;
-using osu.Game.Rulesets.Osu.Objects;
-using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles.Components;
-using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
-using osu.Game.Tests.Beatmaps;
-using osu.Game.Screens.Edit.Compose.Components;
-using osuTK;
-using osuTK.Input;
-
-namespace osu.Game.Tests.Visual.Editing
-{
-    public class TestSceneEditorQuickDelete : EditorTestScene
-    {
-        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
-
-        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
-
-        private BlueprintContainer blueprintContainer
-            => Editor.ChildrenOfType<BlueprintContainer>().First();
-
-        [Test]
-        public void TestQuickDeleteRemovesObject()
-        {
-            var addedObject = new HitCircle { StartTime = 1000 };
-
-            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
-
-            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));
-
-            AddStep("move mouse to object", () =>
-            {
-                var pos = blueprintContainer.ChildrenOfType<HitCirclePiece>().First().ScreenSpaceDrawQuad.Centre;
-                InputManager.MoveMouseTo(pos);
-            });
-            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
-
-            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
-        }
-
-        [Test]
-        public void TestQuickDeleteRemovesSliderControlPoint()
-        {
-            Slider slider = new Slider { StartTime = 1000 };
-
-            PathControlPoint[] points =
-            {
-                new PathControlPoint(),
-                new PathControlPoint(new Vector2(50, 0)),
-                new PathControlPoint(new Vector2(100, 0))
-            };
-
-            AddStep("add slider", () =>
-            {
-                slider.Path = new SliderPath(points);
-                EditorBeatmap.Add(slider);
-            });
-
-            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
-
-            AddStep("move mouse to controlpoint", () =>
-            {
-                var pos = blueprintContainer.ChildrenOfType<PathControlPointPiece>().ElementAt(1).ScreenSpaceDrawQuad.Centre;
-                InputManager.MoveMouseTo(pos);
-            });
-            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
-
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddAssert("slider has 2 points", () => slider.Path.ControlPoints.Count == 2);
-
-            // second click should nuke the object completely.
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
-
-            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
-        }
-    }
-}

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

@@ -0,0 +1,219 @@
+// 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.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles.Components;
+using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
+using osu.Game.Tests.Beatmaps;
+using osu.Game.Screens.Edit.Compose.Components;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Tests.Visual.Editing
+{
+    public class TestSceneEditorSelection : EditorTestScene
+    {
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
+
+        private BlueprintContainer blueprintContainer
+            => Editor.ChildrenOfType<BlueprintContainer>().First();
+
+        private void moveMouseToObject(Func<HitObject> targetFunc)
+        {
+            AddStep("move mouse to object", () =>
+            {
+                var pos = blueprintContainer.SelectionBlueprints
+                                            .First(s => s.HitObject == targetFunc())
+                                            .ChildrenOfType<HitCirclePiece>()
+                                            .First().ScreenSpaceDrawQuad.Centre;
+
+                InputManager.MoveMouseTo(pos);
+            });
+        }
+
+        [Test]
+        public void TestBasicSelect()
+        {
+            var addedObject = new HitCircle { StartTime = 100 };
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            var addedObject2 = new HitCircle
+            {
+                StartTime = 100,
+                Position = new Vector2(100),
+            };
+
+            AddStep("add one more hitobject", () => EditorBeatmap.Add(addedObject2));
+            AddAssert("selection unchanged", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            moveMouseToObject(() => addedObject2);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject2);
+        }
+
+        [Test]
+        public void TestMultiSelect()
+        {
+            var addedObjects = new[]
+            {
+                new HitCircle { StartTime = 100 },
+                new HitCircle { StartTime = 200, Position = new Vector2(50) },
+                new HitCircle { StartTime = 300, Position = new Vector2(100) },
+                new HitCircle { StartTime = 400, Position = new Vector2(150) },
+            };
+
+            AddStep("add hitobjects", () => EditorBeatmap.AddRange(addedObjects));
+
+            moveMouseToObject(() => addedObjects[0]);
+            AddStep("click first", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObjects[0]);
+
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+
+            moveMouseToObject(() => addedObjects[1]);
+            AddStep("click second", () => InputManager.Click(MouseButton.Left));
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+
+            moveMouseToObject(() => addedObjects[2]);
+            AddStep("click third", () => InputManager.Click(MouseButton.Left));
+            AddAssert("3 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 3 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[2]));
+
+            moveMouseToObject(() => addedObjects[1]);
+            AddStep("click second", () => InputManager.Click(MouseButton.Left));
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && !EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+        }
+
+        [TestCase(false)]
+        [TestCase(true)]
+        public void TestMultiSelectFromDrag(bool alreadySelectedBeforeDrag)
+        {
+            HitCircle[] addedObjects = null;
+
+            AddStep("add hitobjects", () => EditorBeatmap.AddRange(addedObjects = new[]
+            {
+                new HitCircle { StartTime = 100 },
+                new HitCircle { StartTime = 200, Position = new Vector2(50) },
+                new HitCircle { StartTime = 300, Position = new Vector2(100) },
+                new HitCircle { StartTime = 400, Position = new Vector2(150) },
+            }));
+
+            moveMouseToObject(() => addedObjects[0]);
+            AddStep("click first", () => InputManager.Click(MouseButton.Left));
+
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+
+            moveMouseToObject(() => addedObjects[1]);
+
+            if (alreadySelectedBeforeDrag)
+                AddStep("click second", () => InputManager.Click(MouseButton.Left));
+
+            AddStep("mouse down on second", () => InputManager.PressButton(MouseButton.Left));
+
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+
+            AddStep("drag to centre", () => InputManager.MoveMouseTo(blueprintContainer.ScreenSpaceDrawQuad.Centre));
+
+            AddAssert("positions changed", () => addedObjects[0].Position != Vector2.Zero && addedObjects[1].Position != new Vector2(50));
+
+            AddStep("release control", () => InputManager.ReleaseKey(Key.ControlLeft));
+            AddStep("mouse up", () => InputManager.ReleaseButton(MouseButton.Left));
+        }
+
+        [Test]
+        public void TestBasicDeselect()
+        {
+            var addedObject = new HitCircle { StartTime = 100 };
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            AddStep("click away", () =>
+            {
+                InputManager.MoveMouseTo(blueprintContainer.ScreenSpaceDrawQuad.Centre);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddAssert("selection lost", () => EditorBeatmap.SelectedHitObjects.Count == 0);
+        }
+
+        [Test]
+        public void TestQuickDeleteRemovesObject()
+        {
+            var addedObject = new HitCircle { StartTime = 1000 };
+
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+
+            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
+
+            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
+        }
+
+        [Test]
+        public void TestQuickDeleteRemovesSliderControlPoint()
+        {
+            Slider slider = null;
+
+            PathControlPoint[] points =
+            {
+                new PathControlPoint(),
+                new PathControlPoint(new Vector2(50, 0)),
+                new PathControlPoint(new Vector2(100, 0))
+            };
+
+            AddStep("add slider", () =>
+            {
+                slider = new Slider
+                {
+                    StartTime = 1000,
+                    Path = new SliderPath(points)
+                };
+
+                EditorBeatmap.Add(slider);
+            });
+
+            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
+
+            AddStep("move mouse to controlpoint", () =>
+            {
+                var pos = blueprintContainer.ChildrenOfType<PathControlPointPiece>().ElementAt(1).ScreenSpaceDrawQuad.Centre;
+                InputManager.MoveMouseTo(pos);
+            });
+            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
+
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+            AddAssert("slider has 2 points", () => slider.Path.ControlPoints.Count == 2);
+
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+
+            // second click should nuke the object completely.
+            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
+
+            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
+        }
+    }
+}

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

@@ -5,7 +5,6 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Osu;
-using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Screens.Edit;
 using osu.Game.Screens.Edit.Components.Timelines.Summary;
 using osuTK;
@@ -16,18 +15,28 @@ namespace osu.Game.Tests.Visual.Editing
     public class TestSceneEditorSummaryTimeline : EditorClockTestScene
     {
         [Cached(typeof(EditorBeatmap))]
-        private readonly EditorBeatmap editorBeatmap = new EditorBeatmap(new OsuBeatmap());
+        private readonly EditorBeatmap editorBeatmap;
 
-        [BackgroundDependencyLoader]
-        private void load()
+        public TestSceneEditorSummaryTimeline()
         {
-            Beatmap.Value = CreateWorkingBeatmap(new OsuRuleset().RulesetInfo);
+            editorBeatmap = new EditorBeatmap(CreateBeatmap(new OsuRuleset().RulesetInfo));
+        }
 
-            Add(new SummaryTimeline
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            AddStep("create timeline", () =>
             {
-                Anchor = Anchor.Centre,
-                Origin = Anchor.Centre,
-                Size = new Vector2(500, 50)
+                // required for track
+                Beatmap.Value = CreateWorkingBeatmap(editorBeatmap.PlayableBeatmap);
+
+                Add(new SummaryTimeline
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(500, 50)
+                });
             });
         }
     }

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

@@ -21,7 +21,7 @@ namespace osu.Game.Tests.Visual.Editing
         [Test]
         public void TestDisallowZeroDurationObjects()
         {
-            DragBar dragBar;
+            DragArea dragArea;
 
             AddStep("add spinner", () =>
             {
@@ -29,7 +29,7 @@ namespace osu.Game.Tests.Visual.Editing
                 EditorBeatmap.Add(new Spinner
                 {
                     Position = new Vector2(256, 256),
-                    StartTime = 150,
+                    StartTime = 2700,
                     Duration = 500
                 });
             });
@@ -37,8 +37,8 @@ namespace osu.Game.Tests.Visual.Editing
             AddStep("hold down drag bar", () =>
             {
                 // distinguishes between the actual drag bar and its "underlay shadow".
-                dragBar = this.ChildrenOfType<DragBar>().Single(bar => bar.HandlePositionalInput);
-                InputManager.MoveMouseTo(dragBar);
+                dragArea = this.ChildrenOfType<DragArea>().Single(bar => bar.HandlePositionalInput);
+                InputManager.MoveMouseTo(dragArea);
                 InputManager.PressButton(MouseButton.Left);
             });
 

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

@@ -64,6 +64,13 @@ namespace osu.Game.Tests.Visual.Editing
             });
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            Clock.Seek(2500);
+        }
+
         public abstract Drawable CreateTestComponent();
 
         private class AudioVisualiser : CompositeDrawable

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

@@ -25,6 +25,7 @@ using osu.Game.Rulesets.Scoring;
 using osu.Game.Scoring;
 using osu.Game.Screens.Play;
 using osu.Game.Screens.Play.PlayerSettings;
+using osu.Game.Utils;
 using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
@@ -48,6 +49,9 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached]
         private readonly VolumeOverlay volumeOverlay;
 
+        [Cached(typeof(BatteryInfo))]
+        private readonly LocalBatteryInfo batteryInfo = new LocalBatteryInfo();
+
         private readonly ChangelogOverlay changelogOverlay;
 
         public TestScenePlayerLoader()
@@ -288,6 +292,33 @@ namespace osu.Game.Tests.Visual.Gameplay
             }
         }
 
+        [TestCase(false, 1.0, false)] // not charging, above cutoff --> no warning
+        [TestCase(true, 0.1, false)] // charging, below cutoff --> no warning
+        [TestCase(false, 0.25, true)] // not charging, at cutoff --> warning
+        public void TestLowBatteryNotification(bool isCharging, double chargeLevel, bool shouldWarn)
+        {
+            AddStep("reset notification lock", () => sessionStatics.GetBindable<bool>(Static.LowBatteryNotificationShownOnce).Value = false);
+
+            // set charge status and level
+            AddStep("load player", () => resetPlayer(false, () =>
+            {
+                batteryInfo.SetCharging(isCharging);
+                batteryInfo.SetChargeLevel(chargeLevel);
+            }));
+            AddUntilStep("wait for player", () => player?.LoadState == LoadState.Ready);
+            AddAssert($"notification {(shouldWarn ? "triggered" : "not triggered")}", () => notificationOverlay.UnreadCount.Value == (shouldWarn ? 1 : 0));
+            AddStep("click notification", () =>
+            {
+                var scrollContainer = (OsuScrollContainer)notificationOverlay.Children.Last();
+                var flowContainer = scrollContainer.Children.OfType<FillFlowContainer<NotificationSection>>().First();
+                var notification = flowContainer.First();
+
+                InputManager.MoveMouseTo(notification);
+                InputManager.Click(MouseButton.Left);
+            });
+            AddUntilStep("wait for player load", () => player.IsLoaded);
+        }
+
         [Test]
         public void TestEpilepsyWarningEarlyExit()
         {
@@ -321,6 +352,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             public override string Name => string.Empty;
             public override string Acronym => string.Empty;
             public override double ScoreMultiplier => 1;
+            public override string Description => string.Empty;
 
             public bool Applied { get; private set; }
 
@@ -348,5 +380,29 @@ namespace osu.Game.Tests.Visual.Gameplay
                     throw new TimeoutException();
             }
         }
+
+        /// <summary>
+        /// Mutable dummy BatteryInfo class for <see cref="TestScenePlayerLoader.TestLowBatteryNotification"/>
+        /// </summary>
+        /// <inheritdoc/>
+        private class LocalBatteryInfo : BatteryInfo
+        {
+            private bool isCharging = true;
+            private double chargeLevel = 1;
+
+            public override bool IsCharging => isCharging;
+
+            public override double ChargeLevel => chargeLevel;
+
+            public void SetCharging(bool value)
+            {
+                isCharging = value;
+            }
+
+            public void SetChargeLevel(double value)
+            {
+                chargeLevel = value;
+            }
+        }
     }
 }

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

@@ -0,0 +1,115 @@
+// 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.Graphics;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Utils;
+using osu.Game.Screens.OnlinePlay.Multiplayer.Spectate;
+using osuTK.Graphics;
+using osuTK.Input;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class TestSceneMultiplayerSpectatorPlayerGrid : OsuManualInputManagerTestScene
+    {
+        private PlayerGrid grid;
+
+        [SetUp]
+        public void Setup() => Schedule(() =>
+        {
+            Child = grid = new PlayerGrid { RelativeSizeAxes = Axes.Both };
+        });
+
+        [Test]
+        public void TestMaximiseAndMinimise()
+        {
+            addCells(2);
+
+            assertMaximisation(0, false, true);
+            assertMaximisation(1, false, true);
+
+            clickCell(0);
+            assertMaximisation(0, true);
+            assertMaximisation(1, false, true);
+            clickCell(0);
+            assertMaximisation(0, false);
+            assertMaximisation(1, false, true);
+
+            clickCell(1);
+            assertMaximisation(1, true);
+            assertMaximisation(0, false, true);
+            clickCell(1);
+            assertMaximisation(1, false);
+            assertMaximisation(0, false, true);
+        }
+
+        [Test]
+        public void TestClickBothCellsSimultaneously()
+        {
+            addCells(2);
+
+            AddStep("click cell 0 then 1", () =>
+            {
+                InputManager.MoveMouseTo(grid.Content.ElementAt(0));
+                InputManager.Click(MouseButton.Left);
+
+                InputManager.MoveMouseTo(grid.Content.ElementAt(1));
+                InputManager.Click(MouseButton.Left);
+            });
+
+            assertMaximisation(1, true);
+            assertMaximisation(0, false);
+        }
+
+        [TestCase(1)]
+        [TestCase(2)]
+        [TestCase(3)]
+        [TestCase(4)]
+        [TestCase(5)]
+        [TestCase(9)]
+        [TestCase(11)]
+        [TestCase(12)]
+        [TestCase(15)]
+        [TestCase(16)]
+        public void TestCellCount(int count)
+        {
+            addCells(count);
+            AddWaitStep("wait for display", 2);
+        }
+
+        private void addCells(int count) => AddStep($"add {count} grid cells", () =>
+        {
+            for (int i = 0; i < count; i++)
+                grid.Add(new GridContent());
+        });
+
+        private void clickCell(int index) => AddStep($"click cell index {index}", () =>
+        {
+            InputManager.MoveMouseTo(grid.Content.ElementAt(index));
+            InputManager.Click(MouseButton.Left);
+        });
+
+        private void assertMaximisation(int index, bool shouldBeMaximised, bool instant = false)
+        {
+            string assertionText = $"cell index {index} {(shouldBeMaximised ? "is" : "is not")} maximised";
+
+            if (instant)
+                AddAssert(assertionText, checkAction);
+            else
+                AddUntilStep(assertionText, checkAction);
+
+            bool checkAction() => Precision.AlmostEquals(grid.MaximisedFacade.DrawSize, grid.Content.ElementAt(index).DrawSize, 10) == shouldBeMaximised;
+        }
+
+        private class GridContent : Box
+        {
+            public GridContent()
+            {
+                RelativeSizeAxes = Axes.Both;
+                Colour = new Color4(RNG.NextSingle(), RNG.NextSingle(), RNG.NextSingle(), 1f);
+            }
+        }
+    }
+}

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

@@ -19,13 +19,12 @@ namespace osu.Game.Tests.Visual.Online
         {
             UserHistoryGraph graph;
 
-            Add(graph = new UserHistoryGraph
+            Add(graph = new UserHistoryGraph("Test")
             {
                 RelativeSizeAxes = Axes.X,
                 Height = 200,
                 Anchor = Anchor.Centre,
                 Origin = Anchor.Centre,
-                TooltipCounterName = "Test"
             });
 
             var values = new[]

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

@@ -57,6 +57,8 @@ namespace osu.Game.Tests.Visual.UserInterface
         private abstract class TestMod : Mod, IApplicableMod
         {
             public override double ScoreMultiplier => 1.0;
+
+            public override string Description => "This is a test mod.";
         }
     }
 }

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

@@ -226,6 +226,8 @@ namespace osu.Game.Tests.Visual.UserInterface
         {
             public override double ScoreMultiplier => 1.0;
 
+            public override string Description => "This is a customisable test mod.";
+
             public override ModType Type => ModType.Conversion;
 
             [SettingSource("Sample float", "Change something for a mod")]

osu.Game.Tests/osu.Game.Tests.csproj

@@ -22,4 +22,4 @@
     <ProjectReference Include="..\osu.Game.Rulesets.Mania\osu.Game.Rulesets.Mania.csproj" />
     <ProjectReference Include="..\osu.Game.Rulesets.Taiko\osu.Game.Rulesets.Taiko.csproj" />
   </ItemGroup>
-</Project>
+</Project>

osu.Game/Configuration/OsuConfigManager.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Diagnostics;
-using osu.Framework.Bindables;
 using osu.Framework.Configuration;
 using osu.Framework.Configuration.Tracking;
 using osu.Framework.Extensions;
@@ -143,7 +142,7 @@ namespace osu.Game.Configuration
 
             SetDefault(OsuSetting.DiscordRichPresence, DiscordRichPresenceMode.Full);
 
-            SetDefault(OsuSetting.EditorWaveformOpacity, 1f);
+            SetDefault(OsuSetting.EditorWaveformOpacity, 0.25f);
         }
 
         public OsuConfigManager(Storage storage)
@@ -169,14 +168,9 @@ namespace osu.Game.Configuration
 
             int combined = (year * 10000) + monthDay;
 
-            if (combined < 20200305)
+            if (combined < 20210413)
             {
-                // the maximum value of this setting was changed.
-                // if we don't manually increase this, it causes song select to filter out beatmaps the user expects to see.
-                var maxStars = (BindableDouble)GetOriginalBindable<double>(OsuSetting.DisplayStarsMaximum);
-
-                if (maxStars.Value == 10)
-                    maxStars.Value = maxStars.MaxValue;
+                SetValue(OsuSetting.EditorWaveformOpacity, 0.25f);
             }
         }
 

osu.Game/Configuration/SessionStatics.cs

@@ -16,6 +16,7 @@ namespace osu.Game.Configuration
         {
             SetDefault(Static.LoginOverlayDisplayed, false);
             SetDefault(Static.MutedAudioNotificationShownOnce, false);
+            SetDefault(Static.LowBatteryNotificationShownOnce, false);
             SetDefault(Static.LastHoverSoundPlaybackTime, (double?)null);
             SetDefault<APISeasonalBackgrounds>(Static.SeasonalBackgrounds, null);
         }
@@ -25,6 +26,7 @@ namespace osu.Game.Configuration
     {
         LoginOverlayDisplayed,
         MutedAudioNotificationShownOnce,
+        LowBatteryNotificationShownOnce,
 
         /// <summary>
         /// Info about seasonal backgrounds available fetched from API - see <see cref="APISeasonalBackgrounds"/>.

osu.Game/Graphics/Containers/OsuFocusedOverlayContainer.cs

@@ -23,6 +23,8 @@ namespace osu.Game.Graphics.Containers
         protected virtual string PopInSampleName => "UI/overlay-pop-in";
         protected virtual string PopOutSampleName => "UI/overlay-pop-out";
 
+        protected override bool BlockScrollInput => false;
+
         protected override bool BlockNonPositionalInput => true;
 
         /// <summary>

osu.Game/Graphics/Containers/UserDimContainer.cs

@@ -23,11 +23,6 @@ namespace osu.Game.Graphics.Containers
 
         protected const double BACKGROUND_FADE_DURATION = 800;
 
-        /// <summary>
-        /// Whether or not user-configured dim levels should be applied to the container.
-        /// </summary>
-        public readonly Bindable<bool> EnableUserDim = new Bindable<bool>(true);
-
         /// <summary>
         /// Whether or not user-configured settings relating to brightness of elements should be ignored
         /// </summary>
@@ -57,7 +52,7 @@ namespace osu.Game.Graphics.Containers
 
         private float breakLightening => LightenDuringBreaks.Value && IsBreakTime.Value ? BREAK_LIGHTEN_AMOUNT : 0;
 
-        protected float DimLevel => Math.Max(EnableUserDim.Value && !IgnoreUserSettings.Value ? (float)UserDimLevel.Value - breakLightening : 0, 0);
+        protected float DimLevel => Math.Max(!IgnoreUserSettings.Value ? (float)UserDimLevel.Value - breakLightening : 0, 0);
 
         protected override Container<Drawable> Content => dimContent;
 
@@ -78,7 +73,6 @@ namespace osu.Game.Graphics.Containers
             LightenDuringBreaks = config.GetBindable<bool>(OsuSetting.LightenDuringBreaks);
             ShowStoryboard = config.GetBindable<bool>(OsuSetting.ShowStoryboard);
 
-            EnableUserDim.ValueChanged += _ => UpdateVisuals();
             UserDimLevel.ValueChanged += _ => UpdateVisuals();
             LightenDuringBreaks.ValueChanged += _ => UpdateVisuals();
             IsBreakTime.ValueChanged += _ => UpdateVisuals();

osu.Game/Input/Bindings/GlobalActionContainer.cs

@@ -70,6 +70,7 @@ namespace osu.Game.Input.Bindings
             new KeyBinding(new[] { InputKey.F2 }, GlobalAction.EditorDesignMode),
             new KeyBinding(new[] { InputKey.F3 }, GlobalAction.EditorTimingMode),
             new KeyBinding(new[] { InputKey.F4 }, GlobalAction.EditorSetupMode),
+            new KeyBinding(new[] { InputKey.Control, InputKey.Shift, InputKey.A }, GlobalAction.EditorVerifyMode),
         };
 
         public IEnumerable<KeyBinding> InGameKeyBindings => new[]
@@ -97,9 +98,7 @@ namespace osu.Game.Input.Bindings
         public IEnumerable<KeyBinding> AudioControlKeyBindings => new[]
         {
             new KeyBinding(new[] { InputKey.Alt, InputKey.Up }, GlobalAction.IncreaseVolume),
-            new KeyBinding(new[] { InputKey.Alt, InputKey.MouseWheelUp }, GlobalAction.IncreaseVolume),
             new KeyBinding(new[] { InputKey.Alt, InputKey.Down }, GlobalAction.DecreaseVolume),
-            new KeyBinding(new[] { InputKey.Alt, InputKey.MouseWheelDown }, GlobalAction.DecreaseVolume),
 
             new KeyBinding(new[] { InputKey.Control, InputKey.F4 }, GlobalAction.ToggleMute),
 
@@ -249,5 +248,8 @@ namespace osu.Game.Input.Bindings
 
         [Description("Beatmap Options")]
         ToggleBeatmapOptions,
+
+        [Description("Verify mode")]
+        EditorVerifyMode,
     }
 }

osu.Game/Migrations/20210412045700_RefreshVolumeBindingsAgain.Designer.cs

@@ -0,0 +1,506 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using osu.Game.Database;
+
+namespace osu.Game.Migrations
+{
+    [DbContext(typeof(OsuDbContext))]
+    [Migration("20210412045700_RefreshVolumeBindingsAgain")]
+    partial class RefreshVolumeBindingsAgain
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "2.2.6-servicing-10079");
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapDifficulty", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<float>("ApproachRate");
+
+                    b.Property<float>("CircleSize");
+
+                    b.Property<float>("DrainRate");
+
+                    b.Property<float>("OverallDifficulty");
+
+                    b.Property<double>("SliderMultiplier");
+
+                    b.Property<double>("SliderTickRate");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapDifficulty");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<double>("AudioLeadIn");
+
+                    b.Property<double>("BPM");
+
+                    b.Property<int>("BaseDifficultyID");
+
+                    b.Property<int>("BeatDivisor");
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<bool>("Countdown");
+
+                    b.Property<double>("DistanceSpacing");
+
+                    b.Property<int>("GridSize");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<bool>("Hidden");
+
+                    b.Property<double>("Length");
+
+                    b.Property<bool>("LetterboxInBreaks");
+
+                    b.Property<string>("MD5Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapID");
+
+                    b.Property<string>("Path");
+
+                    b.Property<int>("RulesetID");
+
+                    b.Property<bool>("SpecialStyle");
+
+                    b.Property<float>("StackLeniency");
+
+                    b.Property<double>("StarDifficulty");
+
+                    b.Property<int>("Status");
+
+                    b.Property<string>("StoredBookmarks");
+
+                    b.Property<double>("TimelineZoom");
+
+                    b.Property<string>("Version");
+
+                    b.Property<bool>("WidescreenStoryboard");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BaseDifficultyID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("Hash");
+
+                    b.HasIndex("MD5Hash");
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapID")
+                        .IsUnique();
+
+                    b.HasIndex("RulesetID");
+
+                    b.ToTable("BeatmapInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapMetadata", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Artist");
+
+                    b.Property<string>("ArtistUnicode");
+
+                    b.Property<string>("AudioFile");
+
+                    b.Property<string>("AuthorString")
+                        .HasColumnName("Author");
+
+                    b.Property<string>("BackgroundFile");
+
+                    b.Property<int>("PreviewTime");
+
+                    b.Property<string>("Source");
+
+                    b.Property<string>("Tags");
+
+                    b.Property<string>("Title");
+
+                    b.Property<string>("TitleUnicode");
+
+                    b.Property<string>("VideoFile");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapMetadata");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.ToTable("BeatmapSetFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<DateTimeOffset>("DateAdded");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapSetID");
+
+                    b.Property<bool>("Protected");
+
+                    b.Property<int>("Status");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapSetID")
+                        .IsUnique();
+
+                    b.ToTable("BeatmapSetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Configuration.DatabasedSetting", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Key")
+                        .HasColumnName("Key");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<int?>("SkinInfoID");
+
+                    b.Property<string>("StringValue")
+                        .HasColumnName("Value");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("SkinInfoID");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("Settings");
+                });
+
+            modelBuilder.Entity("osu.Game.IO.FileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int>("ReferenceCount");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("ReferenceCount");
+
+                    b.ToTable("FileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Input.Bindings.DatabasedKeyBinding", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("IntAction")
+                        .HasColumnName("Action");
+
+                    b.Property<string>("KeysString")
+                        .HasColumnName("Keys");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("IntAction");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("KeyBinding");
+                });
+
+            modelBuilder.Entity("osu.Game.Rulesets.RulesetInfo", b =>
+                {
+                    b.Property<int?>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<bool>("Available");
+
+                    b.Property<string>("InstantiationInfo");
+
+                    b.Property<string>("Name");
+
+                    b.Property<string>("ShortName");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Available");
+
+                    b.HasIndex("ShortName")
+                        .IsUnique();
+
+                    b.ToTable("RulesetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.Property<int?>("ScoreInfoID");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.HasIndex("ScoreInfoID");
+
+                    b.ToTable("ScoreFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<double>("Accuracy")
+                        .HasColumnType("DECIMAL(1,4)");
+
+                    b.Property<int>("BeatmapInfoID");
+
+                    b.Property<int>("Combo");
+
+                    b.Property<DateTimeOffset>("Date");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int>("MaxCombo");
+
+                    b.Property<string>("ModsJson")
+                        .HasColumnName("Mods");
+
+                    b.Property<long?>("OnlineScoreID");
+
+                    b.Property<double?>("PP");
+
+                    b.Property<int>("Rank");
+
+                    b.Property<int>("RulesetID");
+
+                    b.Property<string>("StatisticsJson")
+                        .HasColumnName("Statistics");
+
+                    b.Property<long>("TotalScore");
+
+                    b.Property<long?>("UserID")
+                        .HasColumnName("UserID");
+
+                    b.Property<string>("UserString")
+                        .HasColumnName("User");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BeatmapInfoID");
+
+                    b.HasIndex("OnlineScoreID")
+                        .IsUnique();
+
+                    b.HasIndex("RulesetID");
+
+                    b.ToTable("ScoreInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.Property<int>("SkinInfoID");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.HasIndex("SkinInfoID");
+
+                    b.ToTable("SkinFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Creator");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<string>("Name");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.ToTable("SkinInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapDifficulty", "BaseDifficulty")
+                        .WithMany()
+                        .HasForeignKey("BaseDifficultyID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo", "BeatmapSet")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("MetadataID");
+
+                    b.HasOne("osu.Game.Rulesets.RulesetInfo", "Ruleset")
+                        .WithMany()
+                        .HasForeignKey("RulesetID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("BeatmapSets")
+                        .HasForeignKey("MetadataID");
+                });
+
+            modelBuilder.Entity("osu.Game.Configuration.DatabasedSetting", b =>
+                {
+                    b.HasOne("osu.Game.Skinning.SkinInfo")
+                        .WithMany("Settings")
+                        .HasForeignKey("SkinInfoID");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Scoring.ScoreInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("ScoreInfoID");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapInfo", "Beatmap")
+                        .WithMany("Scores")
+                        .HasForeignKey("BeatmapInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Rulesets.RulesetInfo", "Ruleset")
+                        .WithMany()
+                        .HasForeignKey("RulesetID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Skinning.SkinInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("SkinInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

osu.Game/Migrations/20210412045700_RefreshVolumeBindingsAgain.cs

@@ -0,0 +1,16 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace osu.Game.Migrations
+{
+    public partial class RefreshVolumeBindingsAgain : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql("DELETE FROM KeyBinding WHERE action in (6,7)");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}

osu.Game/Online/API/APIMod.cs

@@ -11,11 +11,12 @@ using osu.Framework.Bindables;
 using osu.Game.Configuration;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Utils;
 
 namespace osu.Game.Online.API
 {
     [MessagePackObject]
-    public class APIMod : IMod
+    public class APIMod : IMod, IEquatable<APIMod>
     {
         [JsonProperty("acronym")]
         [Key(0)]
@@ -63,7 +64,16 @@ namespace osu.Game.Online.API
             return resultMod;
         }
 
-        public bool Equals(IMod other) => Acronym == other?.Acronym;
+        public bool Equals(IMod other) => other is APIMod them && Equals(them);
+
+        public bool Equals(APIMod other)
+        {
+            if (ReferenceEquals(null, other)) return false;
+            if (ReferenceEquals(this, other)) return true;
+
+            return Acronym == other.Acronym &&
+                   Settings.SequenceEqual(other.Settings, ModSettingsEqualityComparer.Default);
+        }
 
         public override string ToString()
         {
@@ -72,5 +82,20 @@ namespace osu.Game.Online.API
 
             return $"{Acronym}";
         }
+
+        private class ModSettingsEqualityComparer : IEqualityComparer<KeyValuePair<string, object>>
+        {
+            public static ModSettingsEqualityComparer Default { get; } = new ModSettingsEqualityComparer();
+
+            public bool Equals(KeyValuePair<string, object> x, KeyValuePair<string, object> y)
+            {
+                object xValue = ModUtils.GetSettingUnderlyingValue(x.Value);
+                object yValue = ModUtils.GetSettingUnderlyingValue(y.Value);
+
+                return x.Key == y.Key && EqualityComparer<object>.Default.Equals(xValue, yValue);
+            }
+
+            public int GetHashCode(KeyValuePair<string, object> obj) => HashCode.Combine(obj.Key, ModUtils.GetSettingUnderlyingValue(obj.Value));
+        }
     }
 }

osu.Game/Online/API/ModSettingsDictionaryFormatter.cs

@@ -3,11 +3,10 @@
 
 using System.Buffers;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Text;
 using MessagePack;
 using MessagePack.Formatters;
-using osu.Framework.Bindables;
+using osu.Game.Utils;
 
 namespace osu.Game.Online.API
 {
@@ -24,36 +23,7 @@ namespace osu.Game.Online.API
                 var stringBytes = new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(kvp.Key));
                 writer.WriteString(in stringBytes);
 
-                switch (kvp.Value)
-                {
-                    case Bindable<double> d:
-                        primitiveFormatter.Serialize(ref writer, d.Value, options);
-                        break;
-
-                    case Bindable<int> i:
-                        primitiveFormatter.Serialize(ref writer, i.Value, options);
-                        break;
-
-                    case Bindable<float> f:
-                        primitiveFormatter.Serialize(ref writer, f.Value, options);
-                        break;
-
-                    case Bindable<bool> b:
-                        primitiveFormatter.Serialize(ref writer, b.Value, options);
-                        break;
-
-                    case IBindable u:
-                        // A mod with unknown (e.g. enum) generic type.
-                        var valueMethod = u.GetType().GetProperty(nameof(IBindable<int>.Value));
-                        Debug.Assert(valueMethod != null);
-                        primitiveFormatter.Serialize(ref writer, valueMethod.GetValue(u), options);
-                        break;
-
-                    default:
-                        // fall back for non-bindable cases.
-                        primitiveFormatter.Serialize(ref writer, kvp.Value, options);
-                        break;
-                }
+                primitiveFormatter.Serialize(ref writer, ModUtils.GetSettingUnderlyingValue(kvp.Value), options);
             }
         }
 

osu.Game/OsuGameBase.cs

@@ -40,6 +40,7 @@ using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Scoring;
 using osu.Game.Skinning;
+using osu.Game.Utils;
 using osuTK.Input;
 using RuntimeInfo = osu.Framework.RuntimeInfo;
 
@@ -156,6 +157,8 @@ namespace osu.Game
 
         protected override UserInputManager CreateUserInputManager() => new OsuUserInputManager();
 
+        protected virtual BatteryInfo CreateBatteryInfo() => null;
+
         /// <summary>
         /// The maximum volume at which audio tracks should playback. This can be set lower than 1 to create some head-room for sound effects.
         /// </summary>
@@ -281,6 +284,11 @@ namespace osu.Game
             dependencies.Cache(KeyBindingStore = new KeyBindingStore(contextFactory, RulesetStore));
             dependencies.Cache(SettingsStore = new SettingsStore(contextFactory));
             dependencies.Cache(RulesetConfigCache = new RulesetConfigCache(SettingsStore));
+
+            var powerStatus = CreateBatteryInfo();
+            if (powerStatus != null)
+                dependencies.CacheAs(powerStatus);
+
             dependencies.Cache(new SessionStatics());
             dependencies.Cache(new OsuColour());
 
@@ -433,12 +441,15 @@ namespace osu.Game
             if (paths.Length == 0)
                 return;
 
-            var extension = Path.GetExtension(paths.First())?.ToLowerInvariant();
+            var filesPerExtension = paths.GroupBy(p => Path.GetExtension(p).ToLowerInvariant());
 
-            foreach (var importer in fileImporters)
+            foreach (var groups in filesPerExtension)
             {
-                if (importer.HandledExtensions.Contains(extension))
-                    await importer.Import(paths).ConfigureAwait(false);
+                foreach (var importer in fileImporters)
+                {
+                    if (importer.HandledExtensions.Contains(groups.Key))
+                        await importer.Import(groups.ToArray()).ConfigureAwait(false);
+                }
             }
         }
 

osu.Game/Overlays/Profile/Sections/Historical/ChartProfileSubsection.cs

@@ -15,6 +15,11 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
     {
         private ProfileLineChart chart;
 
+        /// <summary>
+        /// Text describing the value being plotted on the graph, which will be displayed as a prefix to the value in the history graph tooltip.
+        /// </summary>
+        protected abstract string GraphCounterName { get; }
+
         protected ChartProfileSubsection(Bindable<User> user, string headerText)
             : base(user, headerText)
         {
@@ -30,7 +35,7 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
                 Left = 20,
                 Right = 40
             },
-            Child = chart = new ProfileLineChart()
+            Child = chart = new ProfileLineChart(GraphCounterName)
         };
 
         protected override void LoadComplete()

osu.Game/Overlays/Profile/Sections/Historical/PlayHistorySubsection.cs

@@ -9,6 +9,8 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 {
     public class PlayHistorySubsection : ChartProfileSubsection
     {
+        protected override string GraphCounterName => "Plays";
+
         public PlayHistorySubsection(Bindable<User> user)
             : base(user, "Play History")
         {

osu.Game/Overlays/Profile/Sections/Historical/ProfileLineChart.cs

@@ -42,7 +42,7 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
         private readonly Container<TickLine> rowLinesContainer;
         private readonly Container<TickLine> columnLinesContainer;
 
-        public ProfileLineChart()
+        public ProfileLineChart(string graphCounterName)
         {
             RelativeSizeAxes = Axes.X;
             Height = 250;
@@ -88,7 +88,7 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
                                         }
                                     }
                                 },
-                                graph = new UserHistoryGraph
+                                graph = new UserHistoryGraph(graphCounterName)
                                 {
                                     RelativeSizeAxes = Axes.Both
                                 }

osu.Game/Overlays/Profile/Sections/Historical/ReplaysSubsection.cs

@@ -9,6 +9,8 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 {
     public class ReplaysSubsection : ChartProfileSubsection
     {
+        protected override string GraphCounterName => "Replays Watched";
+
         public ReplaysSubsection(Bindable<User> user)
             : base(user, "Replays Watched History")
         {

osu.Game/Overlays/Profile/Sections/Historical/UserHistoryGraph.cs

@@ -11,25 +11,28 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 {
     public class UserHistoryGraph : UserGraph<DateTime, long>
     {
+        private readonly string tooltipCounterName;
+
         [CanBeNull]
         public UserHistoryCount[] Values
         {
             set => Data = value?.Select(v => new KeyValuePair<DateTime, long>(v.Date, v.Count)).ToArray();
         }
 
-        /// <summary>
-        /// Text describing the value being plotted on the graph, which will be displayed as a prefix to the value in the <see cref="HistoryGraphTooltip"/>.
-        /// </summary>
-        public string TooltipCounterName { get; set; } = "Plays";
+        public UserHistoryGraph(string tooltipCounterName)
+        {
+            this.tooltipCounterName = tooltipCounterName;
+        }
 
         protected override float GetDataPointHeight(long playCount) => playCount;
 
-        protected override UserGraphTooltip GetTooltip() => new HistoryGraphTooltip(TooltipCounterName);
+        protected override UserGraphTooltip GetTooltip() => new HistoryGraphTooltip(tooltipCounterName);
 
         protected override object GetTooltipContent(DateTime date, long playCount)
         {
             return new TooltipDisplayContent
             {
+                Name = tooltipCounterName,
                 Count = playCount.ToString("N0"),
                 Date = date.ToString("MMMM yyyy")
             };
@@ -37,14 +40,17 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 
         protected class HistoryGraphTooltip : UserGraphTooltip
         {
+            private readonly string tooltipCounterName;
+
             public HistoryGraphTooltip(string tooltipCounterName)
                 : base(tooltipCounterName)
             {
+                this.tooltipCounterName = tooltipCounterName;
             }
 
             public override bool SetContent(object content)
             {
-                if (!(content is TooltipDisplayContent info))
+                if (!(content is TooltipDisplayContent info) || info.Name != tooltipCounterName)
                     return false;
 
                 Counter.Text = info.Count;
@@ -55,6 +61,7 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 
         private class TooltipDisplayContent
         {
+            public string Name;
             public string Count;
             public string Date;
         }

osu.Game/Rulesets/Edit/BeatmapVerifier.cs

@@ -0,0 +1,24 @@
+// 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.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit
+{
+    /// <summary>
+    /// A ruleset-agnostic beatmap verifier that identifies issues in common metadata or mapping standards.
+    /// </summary>
+    public class BeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckBackground(),
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap) => checks.SelectMany(check => check.Run(beatmap));
+    }
+}

osu.Game/Rulesets/Edit/Checks/CheckBackground.cs

@@ -0,0 +1,61 @@
+// 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.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit.Checks
+{
+    public class CheckBackground : ICheck
+    {
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Resources, "Missing background");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateNoneSet(this),
+            new IssueTemplateDoesNotExist(this)
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap)
+        {
+            if (beatmap.Metadata.BackgroundFile == null)
+            {
+                yield return new IssueTemplateNoneSet(this).Create();
+
+                yield break;
+            }
+
+            // If the background is set, also make sure it still exists.
+
+            var set = beatmap.BeatmapInfo.BeatmapSet;
+            var file = set.Files.FirstOrDefault(f => f.Filename == beatmap.Metadata.BackgroundFile);
+
+            if (file != null)
+                yield break;
+
+            yield return new IssueTemplateDoesNotExist(this).Create(beatmap.Metadata.BackgroundFile);
+        }
+
+        public class IssueTemplateNoneSet : IssueTemplate
+        {
+            public IssueTemplateNoneSet(ICheck check)
+                : base(check, IssueType.Problem, "No background has been set.")
+            {
+            }
+
+            public Issue Create() => new Issue(this);
+        }
+
+        public class IssueTemplateDoesNotExist : IssueTemplate
+        {
+            public IssueTemplateDoesNotExist(ICheck check)
+                : base(check, IssueType.Problem, "The background file \"{0}\" does not exist.")
+            {
+            }
+
+            public Issue Create(string filename) => new Issue(this, filename);
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/CheckCategory.cs

@@ -0,0 +1,61 @@
+// 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.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// The category of an issue.
+    /// </summary>
+    public enum CheckCategory
+    {
+        /// <summary>
+        /// Anything to do with control points.
+        /// </summary>
+        Timing,
+
+        /// <summary>
+        /// Anything to do with artist, title, creator, etc.
+        /// </summary>
+        Metadata,
+
+        /// <summary>
+        /// Anything to do with non-audio files, e.g. background, skin, sprites, and video.
+        /// </summary>
+        Resources,
+
+        /// <summary>
+        /// Anything to do with audio files, e.g. song and hitsounds.
+        /// </summary>
+        Audio,
+
+        /// <summary>
+        /// Anything to do with files that don't fit into the above, e.g. unused, osu, or osb.
+        /// </summary>
+        Files,
+
+        /// <summary>
+        /// Anything to do with hitobjects unrelated to spread.
+        /// </summary>
+        Compose,
+
+        /// <summary>
+        /// Anything to do with difficulty levels or their progression.
+        /// </summary>
+        Spread,
+
+        /// <summary>
+        /// Anything to do with variables like CS, OD, AR, HP, and global SV.
+        /// </summary>
+        Settings,
+
+        /// <summary>
+        /// Anything to do with hitobject feedback.
+        /// </summary>
+        HitObjects,
+
+        /// <summary>
+        /// Anything to do with storyboarding, breaks, video offset, etc.
+        /// </summary>
+        Events
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/CheckMetadata.cs

@@ -0,0 +1,24 @@
+// 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.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class CheckMetadata
+    {
+        /// <summary>
+        /// The category this check belongs to. E.g. <see cref="CheckCategory.Metadata"/>, <see cref="CheckCategory.Timing"/>, or <see cref="CheckCategory.Compose"/>.
+        /// </summary>
+        public readonly CheckCategory Category;
+
+        /// <summary>
+        /// Describes the issue(s) that this check looks for. Keep this brief, such that it fits into "No {description}". E.g. "Offscreen objects" / "Too short sliders".
+        /// </summary>
+        public readonly string Description;
+
+        public CheckMetadata(CheckCategory category, string description)
+        {
+            Category = category;
+            Description = description;
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/ICheck.cs

@@ -0,0 +1,30 @@
+// 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.Collections.Generic;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// A specific check that can be run on a beatmap to verify or find issues.
+    /// </summary>
+    public interface ICheck
+    {
+        /// <summary>
+        /// The metadata for this check.
+        /// </summary>
+        public CheckMetadata Metadata { get; }
+
+        /// <summary>
+        /// All possible templates for issues that this check may return.
+        /// </summary>
+        public IEnumerable<IssueTemplate> PossibleTemplates { get; }
+
+        /// <summary>
+        /// Runs this check and returns any issues detected for the provided beatmap.
+        /// </summary>
+        /// <param name="beatmap">The beatmap to run the check on.</param>
+        public IEnumerable<Issue> Run(IBeatmap beatmap);
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/Issue.cs

@@ -0,0 +1,77 @@
+// 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.Linq;
+using osu.Game.Extensions;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class Issue
+    {
+        /// <summary>
+        /// The time which this issue is associated with, if any, otherwise null.
+        /// </summary>
+        public double? Time;
+
+        /// <summary>
+        /// The hitobjects which this issue is associated with. Empty by default.
+        /// </summary>
+        public IReadOnlyList<HitObject> HitObjects;
+
+        /// <summary>
+        /// The template which this issue is using. This provides properties such as the <see cref="IssueType"/>, and the <see cref="IssueTemplate.UnformattedMessage"/>.
+        /// </summary>
+        public IssueTemplate Template;
+
+        /// <summary>
+        /// The check that this issue originates from.
+        /// </summary>
+        public ICheck Check => Template.Check;
+
+        /// <summary>
+        /// The arguments that give this issue its context, based on the <see cref="IssueTemplate"/>. These are then substituted into the <see cref="IssueTemplate.UnformattedMessage"/>.
+        /// This could for instance include timestamps, which diff is being compared to, what some volume is, etc.
+        /// </summary>
+        public object[] Arguments;
+
+        public Issue(IssueTemplate template, params object[] args)
+        {
+            Time = null;
+            HitObjects = Array.Empty<HitObject>();
+            Template = template;
+            Arguments = args;
+        }
+
+        public Issue(double? time, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            Time = time;
+        }
+
+        public Issue(HitObject hitObject, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            Time = hitObject.StartTime;
+            HitObjects = new[] { hitObject };
+        }
+
+        public Issue(IEnumerable<HitObject> hitObjects, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            var hitObjectList = hitObjects.ToList();
+
+            Time = hitObjectList.FirstOrDefault()?.StartTime;
+            HitObjects = hitObjectList;
+        }
+
+        public override string ToString() => Template.GetMessage(Arguments);
+
+        public string GetEditorTimestamp()
+        {
+            return Time == null ? string.Empty : Time.Value.ToEditorFormattedString();
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/IssueTemplate.cs

@@ -0,0 +1,74 @@
+// 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 Humanizer;
+using osu.Framework.Graphics;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class IssueTemplate
+    {
+        private static readonly Color4 problem_red = new Colour4(1.0f, 0.4f, 0.4f, 1.0f);
+        private static readonly Color4 warning_yellow = new Colour4(1.0f, 0.8f, 0.2f, 1.0f);
+        private static readonly Color4 negligible_green = new Colour4(0.33f, 0.8f, 0.5f, 1.0f);
+        private static readonly Color4 error_gray = new Colour4(0.5f, 0.5f, 0.5f, 1.0f);
+
+        /// <summary>
+        /// The check that this template originates from.
+        /// </summary>
+        public readonly ICheck Check;
+
+        /// <summary>
+        /// The type of the issue.
+        /// </summary>
+        public readonly IssueType Type;
+
+        /// <summary>
+        /// The unformatted message given when this issue is detected.
+        /// This gets populated later when an issue is constructed with this template.
+        /// E.g. "Inconsistent snapping (1/{0}) with [{1}] (1/{2})."
+        /// </summary>
+        public readonly string UnformattedMessage;
+
+        public IssueTemplate(ICheck check, IssueType type, string unformattedMessage)
+        {
+            Check = check;
+            Type = type;
+            UnformattedMessage = unformattedMessage;
+        }
+
+        /// <summary>
+        /// Returns the formatted message given the arguments used to format it.
+        /// </summary>
+        /// <param name="args">The arguments used to format the message.</param>
+        public string GetMessage(params object[] args) => UnformattedMessage.FormatWith(args);
+
+        /// <summary>
+        /// Returns the colour corresponding to the type of this issue.
+        /// </summary>
+        public Colour4 Colour
+        {
+            get
+            {
+                switch (Type)
+                {
+                    case IssueType.Problem:
+                        return problem_red;
+
+                    case IssueType.Warning:
+                        return warning_yellow;
+
+                    case IssueType.Negligible:
+                        return negligible_green;
+
+                    case IssueType.Error:
+                        return error_gray;
+
+                    default:
+                        return Color4.White;
+                }
+            }
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/IssueType.cs

@@ -0,0 +1,25 @@
+// 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.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// The type, or severity, of an issue.
+    /// </summary>
+    public enum IssueType
+    {
+        /// <summary> A must-fix in the vast majority of cases. </summary>
+        Problem,
+
+        /// <summary> A possible mistake. Often requires critical thinking.  </summary>
+        Warning,
+
+        // TODO: Try/catch all checks run and return error templates if exceptions occur.
+        /// <summary> An error occurred and a complete check could not be made. </summary>
+        Error,
+
+        // TODO: Negligible issues should be hidden by default.
+        /// <summary> A possible mistake so minor/unlikely that it can often be safely ignored. </summary>
+        Negligible,
+    }
+}

osu.Game/Rulesets/Edit/IBeatmapVerifier.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.
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit
+{
+    /// <summary>
+    /// A class which can run against a beatmap and surface issues to the user which could go against known criteria or hinder gameplay.
+    /// </summary>
+    public interface IBeatmapVerifier
+    {
+        public IEnumerable<Issue> Run(IBeatmap beatmap);
+    }
+}

osu.Game/Rulesets/Mods/Mod.cs

@@ -12,6 +12,7 @@ using osu.Framework.Testing;
 using osu.Game.Configuration;
 using osu.Game.IO.Serialization;
 using osu.Game.Rulesets.UI;
+using osu.Game.Utils;
 
 namespace osu.Game.Rulesets.Mods
 {
@@ -19,7 +20,7 @@ namespace osu.Game.Rulesets.Mods
     /// The base class for gameplay modifiers.
     /// </summary>
     [ExcludeFromDynamicCompile]
-    public abstract class Mod : IMod, IJsonSerializable
+    public abstract class Mod : IMod, IEquatable<Mod>, IJsonSerializable
     {
         /// <summary>
         /// The name of this mod.
@@ -48,7 +49,7 @@ namespace osu.Game.Rulesets.Mods
         /// The user readable description of this mod.
         /// </summary>
         [JsonIgnore]
-        public virtual string Description => string.Empty;
+        public abstract string Description { get; }
 
         /// <summary>
         /// The tooltip to display for this mod when used in a <see cref="ModIcon"/>.
@@ -172,7 +173,19 @@ namespace osu.Game.Rulesets.Mods
                 target.Parse(source);
         }
 
-        public bool Equals(IMod other) => GetType() == other?.GetType();
+        public bool Equals(IMod other) => other is Mod them && Equals(them);
+
+        public bool Equals(Mod other)
+        {
+            if (ReferenceEquals(null, other)) return false;
+            if (ReferenceEquals(this, other)) return true;
+
+            return GetType() == other.GetType() &&
+                   this.GetSettingsSourceProperties().All(pair =>
+                       EqualityComparer<object>.Default.Equals(
+                           ModUtils.GetSettingUnderlyingValue(pair.Item2.GetValue(this)),
+                           ModUtils.GetSettingUnderlyingValue(pair.Item2.GetValue(other))));
+        }
 
         /// <summary>
         /// Reset all custom settings for this mod back to their defaults.

osu.Game/Rulesets/Mods/ModCinema.cs

@@ -37,8 +37,7 @@ namespace osu.Game.Rulesets.Mods
 
         public void ApplyToPlayer(Player player)
         {
-            player.ApplyToBackground(b => b.EnableUserDim.Value = false);
-
+            player.ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
             player.DimmableStoryboard.IgnoreUserSettings.Value = true;
 
             player.BreakOverlay.Hide();

osu.Game/Rulesets/Mods/ModNoMod.cs

@@ -12,6 +12,7 @@ namespace osu.Game.Rulesets.Mods
     {
         public override string Name => "No Mod";
         public override string Acronym => "NM";
+        public override string Description => "No mods applied.";
         public override double ScoreMultiplier => 1;
         public override IconUsage? Icon => FontAwesome.Solid.Ban;
         public override ModType Type => ModType.System;

osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs

@@ -56,8 +56,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
 
         public virtual IEnumerable<HitSampleInfo> GetSamples() => HitObject.Samples;
 
-        private readonly Lazy<List<DrawableHitObject>> nestedHitObjects = new Lazy<List<DrawableHitObject>>();
-        public IReadOnlyList<DrawableHitObject> NestedHitObjects => nestedHitObjects.IsValueCreated ? nestedHitObjects.Value : (IReadOnlyList<DrawableHitObject>)Array.Empty<DrawableHitObject>();
+        private readonly List<DrawableHitObject> nestedHitObjects = new List<DrawableHitObject>();
+        public IReadOnlyList<DrawableHitObject> NestedHitObjects => nestedHitObjects;
 
         /// <summary>
         /// Whether this object should handle any user input events.
@@ -249,7 +249,7 @@ namespace osu.Game.Rulesets.Objects.Drawables
                 // Must be done before the nested DHO is added to occur before the nested Apply()!
                 drawableNested.ParentHitObject = this;
 
-                nestedHitObjects.Value.Add(drawableNested);
+                nestedHitObjects.Add(drawableNested);
                 AddNestedHitObject(drawableNested);
             }
 
@@ -305,19 +305,16 @@ namespace osu.Game.Rulesets.Objects.Drawables
             if (Samples != null)
                 Samples.Samples = null;
 
-            if (nestedHitObjects.IsValueCreated)
+            foreach (var obj in nestedHitObjects)
             {
-                foreach (var obj in nestedHitObjects.Value)
-                {
-                    obj.OnNewResult -= onNewResult;
-                    obj.OnRevertResult -= onRevertResult;
-                    obj.ApplyCustomUpdateState -= onApplyCustomUpdateState;
-                }
-
-                nestedHitObjects.Value.Clear();
-                ClearNestedHitObjects();
+                obj.OnNewResult -= onNewResult;
+                obj.OnRevertResult -= onRevertResult;
+                obj.ApplyCustomUpdateState -= onApplyCustomUpdateState;
             }
 
+            nestedHitObjects.Clear();
+            ClearNestedHitObjects();
+
             HitObject.DefaultsApplied -= onDefaultsApplied;
 
             OnFree();

osu.Game/Rulesets/Ruleset.cs

@@ -201,6 +201,8 @@ namespace osu.Game.Rulesets
 
         public virtual HitObjectComposer CreateHitObjectComposer() => null;
 
+        public virtual IBeatmapVerifier CreateBeatmapVerifier() => null;
+
         public virtual Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.Solid.QuestionCircle };
 
         public virtual IResourceStore<byte[]> CreateResourceStore() => new NamespacedResourceStore<byte[]>(new DllResourceStore(GetType().Assembly), @"Resources");

osu.Game/Rulesets/UI/Playfield.cs

@@ -66,7 +66,7 @@ namespace osu.Game.Rulesets.UI
 
                 var enumerable = HitObjectContainer.Objects;
 
-                if (nestedPlayfields.IsValueCreated)
+                if (nestedPlayfields.Count != 0)
                     enumerable = enumerable.Concat(NestedPlayfields.SelectMany(p => p.AllHitObjects));
 
                 return enumerable;
@@ -76,9 +76,9 @@ namespace osu.Game.Rulesets.UI
         /// <summary>
         /// All <see cref="Playfield"/>s nested inside this <see cref="Playfield"/>.
         /// </summary>
-        public IEnumerable<Playfield> NestedPlayfields => nestedPlayfields.IsValueCreated ? nestedPlayfields.Value : Enumerable.Empty<Playfield>();
+        public IEnumerable<Playfield> NestedPlayfields => nestedPlayfields;
 
-        private readonly Lazy<List<Playfield>> nestedPlayfields = new Lazy<List<Playfield>>();
+        private readonly List<Playfield> nestedPlayfields = new List<Playfield>();
 
         /// <summary>
         /// Whether judgements should be displayed by this and and all nested <see cref="Playfield"/>s.
@@ -217,7 +217,7 @@ namespace osu.Game.Rulesets.UI
             otherPlayfield.HitObjectUsageBegan += h => HitObjectUsageBegan?.Invoke(h);
             otherPlayfield.HitObjectUsageFinished += h => HitObjectUsageFinished?.Invoke(h);
 
-            nestedPlayfields.Value.Add(otherPlayfield);
+            nestedPlayfields.Add(otherPlayfield);
         }
 
         protected override void LoadComplete()
@@ -279,12 +279,7 @@ namespace osu.Game.Rulesets.UI
                 return true;
             }
 
-            bool removedFromNested = false;
-
-            if (nestedPlayfields.IsValueCreated)
-                removedFromNested = nestedPlayfields.Value.Any(p => p.Remove(hitObject));
-
-            return removedFromNested;
+            return nestedPlayfields.Any(p => p.Remove(hitObject));
         }
 
         /// <summary>
@@ -429,10 +424,7 @@ namespace osu.Game.Rulesets.UI
                 return;
             }
 
-            if (!nestedPlayfields.IsValueCreated)
-                return;
-
-            foreach (var p in nestedPlayfields.Value)
+            foreach (var p in nestedPlayfields)
                 p.SetKeepAlive(hitObject, keepAlive);
         }
 
@@ -444,10 +436,7 @@ namespace osu.Game.Rulesets.UI
             foreach (var (_, entry) in lifetimeEntryMap)
                 entry.KeepAlive = true;
 
-            if (!nestedPlayfields.IsValueCreated)
-                return;
-
-            foreach (var p in nestedPlayfields.Value)
+            foreach (var p in nestedPlayfields)
                 p.KeepAllAlive();
         }
 
@@ -461,10 +450,7 @@ namespace osu.Game.Rulesets.UI
             {
                 HitObjectContainer.PastLifetimeExtension = value;
 
-                if (!nestedPlayfields.IsValueCreated)
-                    return;
-
-                foreach (var nested in nestedPlayfields.Value)
+                foreach (var nested in nestedPlayfields)
                     nested.PastLifetimeExtension = value;
             }
         }
@@ -479,10 +465,7 @@ namespace osu.Game.Rulesets.UI
             {
                 HitObjectContainer.FutureLifetimeExtension = value;
 
-                if (!nestedPlayfields.IsValueCreated)
-                    return;
-
-                foreach (var nested in nestedPlayfields.Value)
+                foreach (var nested in nestedPlayfields)
                     nested.FutureLifetimeExtension = value;
             }
         }

osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs

@@ -27,9 +27,12 @@ namespace osu.Game.Screens.Backgrounds
         private WorkingBeatmap beatmap;
 
         /// <summary>
-        /// Whether or not user dim settings should be applied to this Background.
+        /// Whether or not user-configured settings relating to brightness of elements should be ignored.
         /// </summary>
-        public readonly Bindable<bool> EnableUserDim = new Bindable<bool>();
+        /// <remarks>
+        /// Beatmap background screens should not apply user settings by default.
+        /// </remarks>
+        public readonly Bindable<bool> IgnoreUserSettings = new Bindable<bool>(true);
 
         public readonly Bindable<bool> StoryboardReplacesBackground = new Bindable<bool>();
 
@@ -50,7 +53,7 @@ namespace osu.Game.Screens.Backgrounds
 
             InternalChild = dimmable = CreateFadeContainer();
 
-            dimmable.EnableUserDim.BindTo(EnableUserDim);
+            dimmable.IgnoreUserSettings.BindTo(IgnoreUserSettings);
             dimmable.IsBreakTime.BindTo(IsBreakTime);
             dimmable.BlurAmount.BindTo(BlurAmount);
 
@@ -148,7 +151,7 @@ namespace osu.Game.Screens.Backgrounds
             /// <summary>
             /// As an optimisation, we add the two blur portions to be applied rather than actually applying two separate blurs.
             /// </summary>
-            private Vector2 blurTarget => EnableUserDim.Value
+            private Vector2 blurTarget => !IgnoreUserSettings.Value
                 ? new Vector2(BlurAmount.Value + (float)userBlurLevel.Value * USER_BLUR_FACTOR)
                 : new Vector2(BlurAmount.Value);
 
@@ -166,7 +169,9 @@ namespace osu.Game.Screens.Backgrounds
                 BlurAmount.ValueChanged += _ => UpdateVisuals();
             }
 
-            protected override bool ShowDimContent => !ShowStoryboard.Value || !StoryboardReplacesBackground.Value; // The background needs to be hidden in the case of it being replaced by the storyboard
+            protected override bool ShowDimContent
+                // The background needs to be hidden in the case of it being replaced by the storyboard
+                => (!ShowStoryboard.Value && !IgnoreUserSettings.Value) || !StoryboardReplacesBackground.Value;
 
             protected override void UpdateVisuals()
             {

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/BreakPart.cs

@@ -28,7 +28,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours) => Colour = colours.Yellow;
+            private void load(OsuColour colours) => Colour = colours.GreyCarmineLight;
         }
     }
 }

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/ControlPointVisualisation.cs

@@ -0,0 +1,30 @@
+// 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.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
+
+namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
+{
+    public class ControlPointVisualisation : PointVisualisation
+    {
+        protected readonly ControlPoint Point;
+
+        public ControlPointVisualisation(ControlPoint point)
+        {
+            Point = point;
+
+            Height = 0.25f;
+            Origin = Anchor.TopCentre;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            Colour = Point.GetRepresentingColour(colours);
+        }
+    }
+}

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/EffectPointVisualisation.cs

@@ -0,0 +1,72 @@
+// 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 osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
+
+namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
+{
+    public class EffectPointVisualisation : CompositeDrawable
+    {
+        private readonly EffectControlPoint effect;
+        private Bindable<bool> kiai;
+
+        [Resolved]
+        private EditorBeatmap beatmap { get; set; }
+
+        [Resolved]
+        private OsuColour colours { get; set; }
+
+        public EffectPointVisualisation(EffectControlPoint point)
+        {
+            RelativePositionAxes = Axes.Both;
+            RelativeSizeAxes = Axes.Y;
+
+            effect = point;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            kiai = effect.KiaiModeBindable.GetBoundCopy();
+            kiai.BindValueChanged(_ =>
+            {
+                ClearInternal();
+
+                AddInternal(new ControlPointVisualisation(effect));
+
+                if (!kiai.Value)
+                    return;
+
+                var endControlPoint = beatmap.ControlPointInfo.EffectPoints.FirstOrDefault(c => c.Time > effect.Time && !c.KiaiMode);
+
+                // handle kiai duration
+                // eventually this will be simpler when we have control points with durations.
+                if (endControlPoint != null)
+                {
+                    RelativeSizeAxes = Axes.Both;
+                    Origin = Anchor.TopLeft;
+
+                    Width = (float)(endControlPoint.Time - effect.Time);
+
+                    AddInternal(new PointVisualisation
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Origin = Anchor.TopLeft,
+                        Width = 1,
+                        Height = 0.25f,
+                        Depth = float.MaxValue,
+                        Colour = effect.GetRepresentingColour(colours).Darken(0.5f),
+                    });
+                }
+            }, true);
+        }
+    }
+}

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/GroupVisualisation.cs

@@ -1,29 +1,33 @@
 // 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 osu.Framework.Allocation;
 using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Graphics;
-using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
-using osuTK.Graphics;
 
 namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
 {
-    public class GroupVisualisation : PointVisualisation
+    public class GroupVisualisation : CompositeDrawable
     {
+        [Resolved]
+        private OsuColour colours { get; set; }
+
         public readonly ControlPointGroup Group;
 
         private readonly IBindableList<ControlPoint> controlPoints = new BindableList<ControlPoint>();
 
-        [Resolved]
-        private OsuColour colours { get; set; }
-
         public GroupVisualisation(ControlPointGroup group)
-            : base(group.Time)
         {
+            RelativePositionAxes = Axes.X;
+
+            RelativeSizeAxes = Axes.Both;
+            Origin = Anchor.TopLeft;
+
             Group = group;
+            X = (float)group.Time;
         }
 
         protected override void LoadComplete()
@@ -33,13 +37,32 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
             controlPoints.BindTo(Group.ControlPoints);
             controlPoints.BindCollectionChanged((_, __) =>
             {
-                if (controlPoints.Count == 0)
-                {
-                    Colour = Color4.Transparent;
-                    return;
-                }
+                ClearInternal();
 
-                Colour = controlPoints.Any(c => c is TimingControlPoint) ? colours.YellowDark : colours.Green;
+                if (controlPoints.Count == 0)
+                    return;
+
+                foreach (var point in Group.ControlPoints)
+                {
+                    switch (point)
+                    {
+                        case TimingControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0, });
+                            break;
+
+                        case DifficultyControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0.25f, });
+                            break;
+
+                        case SampleControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0.5f, });
+                            break;
+
+                        case EffectControlPoint effect:
+                            AddInternal(new EffectPointVisualisation(effect) { Y = 0.75f });
+                            break;
+                    }
+                }
             }, true);
         }
     }

osu.Game/Screens/Edit/Components/Timelines/Summary/SummaryTimeline.cs

@@ -27,6 +27,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                     Anchor = Anchor.Centre,
                     Origin = Anchor.BottomCentre,
                     RelativeSizeAxes = Axes.Both,
+                    Y = -10,
                     Height = 0.35f
                 },
                 new BookmarkPart
@@ -38,6 +39,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                 },
                 new Container
                 {
+                    Name = "centre line",
                     RelativeSizeAxes = Axes.Both,
                     Colour = colours.Gray5,
                     Children = new Drawable[]
@@ -45,7 +47,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                         new Circle
                         {
                             Anchor = Anchor.CentreLeft,
-                            Origin = Anchor.CentreRight,
+                            Origin = Anchor.Centre,
                             Size = new Vector2(5)
                         },
                         new Box
@@ -59,7 +61,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                         new Circle
                         {
                             Anchor = Anchor.CentreRight,
-                            Origin = Anchor.CentreLeft,
+                            Origin = Anchor.Centre,
                             Size = new Vector2(5)
                         },
                     }
@@ -69,7 +71,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
                     RelativeSizeAxes = Axes.Both,
-                    Height = 0.25f
+                    Height = 0.10f
                 }
             };
         }

osu.Game/Screens/Edit/Components/Timelines/Summary/Visualisations/DurationVisualisation.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 
 namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
@@ -10,19 +9,15 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
     /// <summary>
     /// Represents a spanning point on a timeline part.
     /// </summary>
-    public class DurationVisualisation : Container
+    public class DurationVisualisation : Circle
     {
         protected DurationVisualisation(double startTime, double endTime)
         {
-            Masking = true;
-            CornerRadius = 5;
-
             RelativePositionAxes = Axes.X;
             RelativeSizeAxes = Axes.Both;
+
             X = (float)startTime;
             Width = (float)(endTime - startTime);
-
-            AddInternal(new Box { RelativeSizeAxes = Axes.Both });
         }
     }
 }

osu.Game/Screens/Edit/Components/Timelines/Summary/Visualisations/PointVisualisation.cs

@@ -3,16 +3,15 @@
 
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
-using osuTK;
 
 namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
 {
     /// <summary>
     /// Represents a singular point on a timeline part.
     /// </summary>
-    public class PointVisualisation : Box
+    public class PointVisualisation : Circle
     {
-        public const float WIDTH = 1;
+        public const float MAX_WIDTH = 4;
 
         public PointVisualisation(double startTime)
             : this()
@@ -22,13 +21,14 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
 
         public PointVisualisation()
         {
-            Origin = Anchor.TopCentre;
-
-            RelativePositionAxes = Axes.X;
+            RelativePositionAxes = Axes.Both;
             RelativeSizeAxes = Axes.Y;
 
-            Width = WIDTH;
-            EdgeSmoothness = new Vector2(WIDTH, 0);
+            Anchor = Anchor.CentreLeft;
+            Origin = Anchor.Centre;
+
+            Width = MAX_WIDTH;
+            Height = 0.75f;
         }
     }
 }

osu.Game/Screens/Edit/Compose/Components/BlueprintContainer.cs

@@ -135,11 +135,12 @@ namespace osu.Game.Screens.Edit.Compose.Components
 
         protected override bool OnMouseDown(MouseDownEvent e)
         {
-            if (!beginClickSelection(e)) return true;
+            bool selectionPerformed = performMouseDownActions(e);
 
+            // even if a selection didn't occur, a drag event may still move the selection.
             prepareSelectionMovement();
 
-            return e.Button == MouseButton.Left;
+            return selectionPerformed || e.Button == MouseButton.Left;
         }
 
         private SelectionBlueprint clickedBlueprint;
@@ -154,7 +155,7 @@ namespace osu.Game.Screens.Edit.Compose.Components
 
             // Deselection should only occur if no selected blueprints are hovered
             // A special case for when a blueprint was selected via this click is added since OnClick() may occur outside the hitobject and should not trigger deselection
-            if (endClickSelection() || clickedBlueprint != null)
+            if (endClickSelection(e) || clickedBlueprint != null)
                 return true;
 
             deselectAll();
@@ -177,7 +178,12 @@ namespace osu.Game.Screens.Edit.Compose.Components
         protected override void OnMouseUp(MouseUpEvent e)
         {
             // Special case for when a drag happened instead of a click
-            Schedule(() => endClickSelection());
+            Schedule(() =>
+            {
+                endClickSelection(e);
+                clickSelectionBegan = false;
+                isDraggingBlueprint = false;
+            });
 
             finishSelectionMovement();
         }
@@ -226,7 +232,6 @@ namespace osu.Game.Screens.Edit.Compose.Components
                     Beatmap.Update(obj);
 
                 changeHandler?.EndChange();
-                isDraggingBlueprint = false;
             }
 
             if (DragBox.State == Visibility.Visible)
@@ -338,7 +343,7 @@ namespace osu.Game.Screens.Edit.Compose.Components
         /// </summary>
         /// <param name="e">The input event that triggered this selection.</param>
         /// <returns>Whether a selection was performed.</returns>
-        private bool beginClickSelection(MouseButtonEvent e)
+        private bool performMouseDownActions(MouseButtonEvent e)
         {
             // Iterate from the top of the input stack (blueprints closest to the front of the screen first).
             // Priority is given to already-selected blueprints.
@@ -346,7 +351,7 @@ namespace osu.Game.Screens.Edit.Compose.Components
             {
                 if (!blueprint.IsHovered) continue;
 
-                return clickSelectionBegan = SelectionHandler.HandleSelectionRequested(blueprint, e);
+                return clickSelectionBegan = SelectionHandler.MouseDownSelectionRequested(blueprint, e);
             }
 
             return false;
@@ -355,13 +360,28 @@ namespace osu.Game.Screens.Edit.Compose.Components
         /// <summary>
         /// Finishes the current blueprint selection.
         /// </summary>
+        /// <param name="e">The mouse event which triggered end of selection.</param>
         /// <returns>Whether a click selection was active.</returns>
-        private bool endClickSelection()
+        private bool endClickSelection(MouseButtonEvent e)
         {
-            if (!clickSelectionBegan)
-                return false;
+            if (!clickSelectionBegan && !isDraggingBlueprint)
+            {
+                // if a selection didn't occur, we may want to trigger a deselection.
+                if (e.ControlPressed && e.Button == MouseButton.Left)
+                {
+                    // Iterate from the top of the input stack (blueprints closest to the front of the screen first).
+                    // Priority is given to already-selected blueprints.
+                    foreach (SelectionBlueprint blueprint in SelectionBlueprints.AliveChildren.Reverse().OrderByDescending(b => b.IsSelected))
+                    {
+                        if (!blueprint.IsHovered) continue;
+
+                        return clickSelectionBegan = SelectionHandler.MouseUpSelectionRequested(blueprint, e);
+                    }
+                }
+
+                return false;
+            }
 
-            clickSelectionBegan = false;
             return true;
         }
 

osu.Game/Screens/Edit/Compose/Components/SelectionHandler.cs

@@ -220,20 +220,39 @@ namespace osu.Game.Screens.Edit.Compose.Components
         /// <param name="blueprint">The blueprint.</param>
         /// <param name="e">The mouse event responsible for selection.</param>
         /// <returns>Whether a selection was performed.</returns>
-        internal bool HandleSelectionRequested(SelectionBlueprint blueprint, MouseButtonEvent e)
+        internal bool MouseDownSelectionRequested(SelectionBlueprint blueprint, MouseButtonEvent e)
         {
             if (e.ShiftPressed && e.Button == MouseButton.Right)
             {
                 handleQuickDeletion(blueprint);
-                return false;
+                return true;
             }
 
-            if (e.ControlPressed && e.Button == MouseButton.Left)
+            // while holding control, we only want to add to selection, not replace an existing selection.
+            if (e.ControlPressed && e.Button == MouseButton.Left && !blueprint.IsSelected)
+            {
                 blueprint.ToggleSelection();
-            else
-                ensureSelected(blueprint);
+                return true;
+            }
 
-            return true;
+            return ensureSelected(blueprint);
+        }
+
+        /// <summary>
+        /// Handle a blueprint requesting selection.
+        /// </summary>
+        /// <param name="blueprint">The blueprint.</param>
+        /// <param name="e">The mouse event responsible for deselection.</param>
+        /// <returns>Whether a deselection was performed.</returns>
+        internal bool MouseUpSelectionRequested(SelectionBlueprint blueprint, MouseButtonEvent e)
+        {
+            if (blueprint.IsSelected)
+            {
+                blueprint.ToggleSelection();
+                return true;
+            }
+
+            return false;
         }
 
         private void handleQuickDeletion(SelectionBlueprint blueprint)
@@ -247,13 +266,19 @@ namespace osu.Game.Screens.Edit.Compose.Components
                 deleteSelected();
         }
 
-        private void ensureSelected(SelectionBlueprint blueprint)
+        /// <summary>
+        /// Ensure the blueprint is in a selected state.
+        /// </summary>
+        /// <param name="blueprint">The blueprint to select.</param>
+        /// <returns>Whether selection state was changed.</returns>
+        private bool ensureSelected(SelectionBlueprint blueprint)
         {
             if (blueprint.IsSelected)
-                return;
+                return false;
 
             DeselectAll?.Invoke();
             blueprint.Select();
+            return true;
         }
 
         private void deleteSelected()

osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineBlueprintContainer.cs

@@ -63,7 +63,8 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         {
             AddInternal(backgroundBox = new SelectableAreaBackground
             {
-                Colour = Color4.Black
+                Colour = Color4.Black,
+                Depth = float.MaxValue,
             });
         }
 

osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineHitObjectBlueprint.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using JetBrains.Annotations;
 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;
@@ -16,7 +17,6 @@ using osu.Framework.Input.Events;
 using osu.Framework.Utils;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
-using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
@@ -28,9 +28,9 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
 {
     public class TimelineHitObjectBlueprint : SelectionBlueprint
     {
-        private const float thickness = 5;
-        private const float shadow_radius = 5;
-        private const float circle_size = 34;
+        private const float circle_size = 38;
+
+        private Container repeatsContainer;
 
         public Action<DragEvent> OnDragHandled;
 
@@ -40,10 +40,9 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         private Bindable<int> indexInCurrentComboBindable;
         private Bindable<int> comboIndexBindable;
 
-        private readonly Circle circle;
-        private readonly DragBar dragBar;
-        private readonly List<Container> shadowComponents = new List<Container>();
-        private readonly Container mainComponents;
+        private readonly Drawable circle;
+
+        private readonly Container colouredComponents;
         private readonly OsuSpriteText comboIndexText;
 
         [Resolved]
@@ -61,89 +60,41 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             RelativePositionAxes = Axes.X;
 
             RelativeSizeAxes = Axes.X;
-            AutoSizeAxes = Axes.Y;
+            Height = circle_size;
 
-            AddRangeInternal(new Drawable[]
+            AddRangeInternal(new[]
             {
-                mainComponents = new Container
+                circle = new ExtendableCircle
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Anchor = Anchor.CentreLeft,
+                    Origin = Anchor.CentreLeft,
+                },
+                colouredComponents = new Container
                 {
                     Anchor = Anchor.CentreLeft,
                     Origin = Anchor.CentreLeft,
-                    RelativeSizeAxes = Axes.X,
-                    AutoSizeAxes = Axes.Y,
-                },
-                comboIndexText = new OsuSpriteText
-                {
-                    Anchor = Anchor.CentreLeft,
-                    Origin = Anchor.Centre,
-                    Font = OsuFont.Numeric.With(size: circle_size / 2, weight: FontWeight.Black),
+                    RelativeSizeAxes = Axes.Both,
+                    Children = new Drawable[]
+                    {
+                        comboIndexText = new OsuSpriteText
+                        {
+                            Anchor = Anchor.CentreLeft,
+                            Origin = Anchor.Centre,
+                            Y = -1,
+                            Font = OsuFont.Default.With(size: circle_size * 0.5f, weight: FontWeight.Regular),
+                        },
+                    }
                 },
             });
 
-            circle = new Circle
-            {
-                Size = new Vector2(circle_size),
-                Anchor = Anchor.CentreLeft,
-                Origin = Anchor.Centre,
-                EdgeEffect = new EdgeEffectParameters
-                {
-                    Type = EdgeEffectType.Shadow,
-                    Radius = shadow_radius,
-                    Colour = Color4.Black
-                },
-            };
-
-            shadowComponents.Add(circle);
-
             if (hitObject is IHasDuration)
             {
-                DragBar dragBarUnderlay;
-                Container extensionBar;
-
-                mainComponents.AddRange(new Drawable[]
+                colouredComponents.Add(new DragArea(hitObject)
                 {
-                    extensionBar = new Container
-                    {
-                        Masking = true,
-                        Size = new Vector2(1, thickness),
-                        Anchor = Anchor.CentreLeft,
-                        Origin = Anchor.CentreLeft,
-                        RelativePositionAxes = Axes.X,
-                        RelativeSizeAxes = Axes.X,
-                        EdgeEffect = new EdgeEffectParameters
-                        {
-                            Type = EdgeEffectType.Shadow,
-                            Radius = shadow_radius,
-                            Colour = Color4.Black
-                        },
-                        Child = new Box
-                        {
-                            RelativeSizeAxes = Axes.Both,
-                        }
-                    },
-                    circle,
-                    // only used for drawing the shadow
-                    dragBarUnderlay = new DragBar(null),
-                    // cover up the shadow on the join
-                    new Box
-                    {
-                        Height = thickness,
-                        Anchor = Anchor.CentreLeft,
-                        Origin = Anchor.CentreLeft,
-                        RelativeSizeAxes = Axes.X,
-                    },
-                    dragBar = new DragBar(hitObject) { OnDragHandled = e => OnDragHandled?.Invoke(e) },
+                    OnDragHandled = e => OnDragHandled?.Invoke(e)
                 });
-
-                shadowComponents.Add(dragBarUnderlay);
-                shadowComponents.Add(extensionBar);
             }
-            else
-            {
-                mainComponents.Add(circle);
-            }
-
-            updateShadows();
         }
 
         protected override void LoadComplete()
@@ -162,6 +113,16 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             }
         }
 
+        protected override void OnSelected()
+        {
+            // base logic hides selected blueprints when not selected, but timeline doesn't do that.
+        }
+
+        protected override void OnDeselected()
+        {
+            // base logic hides selected blueprints when not selected, but timeline doesn't do that.
+        }
+
         private void updateComboIndex() => comboIndexText.Text = (indexInCurrentComboBindable.Value + 1).ToString();
 
         private void updateComboColour()
@@ -173,15 +134,15 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             var comboColour = combo.GetComboColour(comboColours);
 
             if (HitObject is IHasDuration)
-                mainComponents.Colour = ColourInfo.GradientHorizontal(comboColour, Color4.White);
+                circle.Colour = ColourInfo.GradientHorizontal(comboColour, comboColour.Lighten(0.4f));
             else
-                mainComponents.Colour = comboColour;
+                circle.Colour = comboColour;
 
-            var col = mainComponents.Colour.TopLeft.Linear;
+            var col = circle.Colour.TopLeft.Linear;
             float brightness = col.R + col.G + col.B;
 
             // decide the combo index colour based on brightness?
-            comboIndexText.Colour = brightness > 0.5f ? Color4.Black : Color4.White;
+            colouredComponents.Colour = OsuColour.Gray(brightness > 0.5f ? 0.2f : 0.9f);
         }
 
         protected override void Update()
@@ -201,13 +162,11 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             }
         }
 
-        private Container repeatsContainer;
-
         private void updateRepeats(IHasRepeats repeats)
         {
             repeatsContainer?.Expire();
 
-            mainComponents.Add(repeatsContainer = new Container
+            colouredComponents.Add(repeatsContainer = new Container
             {
                 RelativeSizeAxes = Axes.Both,
             });
@@ -216,7 +175,8 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             {
                 repeatsContainer.Add(new Circle
                 {
-                    Size = new Vector2(circle_size / 2),
+                    Size = new Vector2(circle_size / 3),
+                    Alpha = 0.2f,
                     Anchor = Anchor.CentreLeft,
                     Origin = Anchor.Centre,
                     RelativePositionAxes = Axes.X,
@@ -228,61 +188,13 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         protected override bool ShouldBeConsideredForInput(Drawable child) => true;
 
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
-            base.ReceivePositionalInputAt(screenSpacePos) ||
-            circle.ReceivePositionalInputAt(screenSpacePos) ||
-            dragBar?.ReceivePositionalInputAt(screenSpacePos) == true;
+            circle.ReceivePositionalInputAt(screenSpacePos);
 
-        protected override void OnSelected()
-        {
-            updateShadows();
-        }
-
-        private void updateShadows()
-        {
-            foreach (var s in shadowComponents)
-            {
-                if (State == SelectionState.Selected)
-                {
-                    s.EdgeEffect = new EdgeEffectParameters
-                    {
-                        Type = EdgeEffectType.Shadow,
-                        Radius = shadow_radius / 2,
-                        Colour = Color4.Orange,
-                    };
-                }
-                else
-                {
-                    s.EdgeEffect = new EdgeEffectParameters
-                    {
-                        Type = EdgeEffectType.Shadow,
-                        Radius = shadow_radius,
-                        Colour = State == SelectionState.Selected ? Color4.Orange : Color4.Black
-                    };
-                }
-            }
-        }
-
-        protected override void OnDeselected()
-        {
-            updateShadows();
-        }
-
-        public override Quad SelectionQuad
-        {
-            get
-            {
-                // correctly include the circle in the selection quad region, as it is usually outside the blueprint itself.
-                var leftQuad = circle.ScreenSpaceDrawQuad;
-                var rightQuad = dragBar?.ScreenSpaceDrawQuad ?? ScreenSpaceDrawQuad;
-
-                return new Quad(leftQuad.TopLeft, Vector2.ComponentMax(rightQuad.TopRight, leftQuad.TopRight),
-                    leftQuad.BottomLeft, Vector2.ComponentMax(rightQuad.BottomRight, leftQuad.BottomRight));
-            }
-        }
+        public override Quad SelectionQuad => circle.ScreenSpaceDrawQuad;
 
         public override Vector2 ScreenSpaceSelectionPoint => ScreenSpaceDrawQuad.TopLeft;
 
-        public class DragBar : Container
+        public class DragArea : Circle
         {
             private readonly HitObject hitObject;
 
@@ -293,13 +205,13 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
 
             public override bool HandlePositionalInput => hitObject != null;
 
-            public DragBar(HitObject hitObject)
+            public DragArea(HitObject hitObject)
             {
                 this.hitObject = hitObject;
 
-                CornerRadius = 2;
+                CornerRadius = circle_size / 2;
                 Masking = true;
-                Size = new Vector2(5, 1);
+                Size = new Vector2(circle_size, 1);
                 Anchor = Anchor.CentreRight;
                 Origin = Anchor.Centre;
                 RelativePositionAxes = Axes.X;
@@ -314,6 +226,14 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                 };
             }
 
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
+
+                updateState();
+                FinishTransforms();
+            }
+
             protected override bool OnHover(HoverEvent e)
             {
                 updateState();
@@ -345,7 +265,20 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
 
             private void updateState()
             {
-                Colour = IsHovered || hasMouseDown ? Color4.OrangeRed : Color4.White;
+                if (hasMouseDown)
+                {
+                    this.ScaleTo(0.7f, 200, Easing.OutQuint);
+                }
+                else if (IsHovered)
+                {
+                    this.ScaleTo(0.8f, 200, Easing.OutQuint);
+                }
+                else
+                {
+                    this.ScaleTo(0.6f, 200, Easing.OutQuint);
+                }
+
+                this.FadeTo(IsHovered || hasMouseDown ? 0.8f : 0.2f, 200, Easing.OutQuint);
             }
 
             [Resolved]
@@ -406,5 +339,37 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                 changeHandler?.EndChange();
             }
         }
+
+        /// <summary>
+        /// A circle with externalised end caps so it can take up the full width of a relative width area.
+        /// </summary>
+        public class ExtendableCircle : CompositeDrawable
+        {
+            private readonly CircularContainer content;
+
+            public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => content.ReceivePositionalInputAt(screenSpacePos);
+
+            public override Quad ScreenSpaceDrawQuad => content.ScreenSpaceDrawQuad;
+
+            public ExtendableCircle()
+            {
+                Padding = new MarginPadding { Horizontal = -circle_size / 2f };
+                InternalChild = content = new CircularContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    EdgeEffect = new EdgeEffectParameters
+                    {
+                        Type = EdgeEffectType.Shadow,
+                        Radius = 5,
+                        Colour = Color4.Black.Opacity(0.4f)
+                    },
+                    Child = new Box
+                    {
+                        RelativeSizeAxes = Axes.Both
+                    }
+                };
+            }
+        }
     }
 }

osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineTickDisplay.cs

@@ -6,9 +6,7 @@ using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Caching;
-using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Colour;
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Screens.Edit.Components.Timelines.Summary.Parts;
@@ -33,6 +31,8 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         [Resolved]
         private OsuColour colours { get; set; }
 
+        private static readonly int highest_divisor = BindableBeatDivisor.VALID_DIVISORS.Last();
+
         public TimelineTickDisplay()
         {
             RelativeSizeAxes = Axes.Both;
@@ -80,8 +80,8 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             if (timeline != null)
             {
                 var newRange = (
-                    (ToLocalSpace(timeline.ScreenSpaceDrawQuad.TopLeft).X - PointVisualisation.WIDTH * 2) / DrawWidth * Content.RelativeChildSize.X,
-                    (ToLocalSpace(timeline.ScreenSpaceDrawQuad.TopRight).X + PointVisualisation.WIDTH * 2) / DrawWidth * Content.RelativeChildSize.X);
+                    (ToLocalSpace(timeline.ScreenSpaceDrawQuad.TopLeft).X - PointVisualisation.MAX_WIDTH * 2) / DrawWidth * Content.RelativeChildSize.X,
+                    (ToLocalSpace(timeline.ScreenSpaceDrawQuad.TopRight).X + PointVisualisation.MAX_WIDTH * 2) / DrawWidth * Content.RelativeChildSize.X);
 
                 if (visibleRange != newRange)
                 {
@@ -100,7 +100,6 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         private void createTicks()
         {
             int drawableIndex = 0;
-            int highestDivisor = BindableBeatDivisor.VALID_DIVISORS.Last();
 
             nextMinTick = null;
             nextMaxTick = null;
@@ -131,25 +130,13 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                         var divisor = BindableBeatDivisor.GetDivisorForBeatIndex(beat, beatDivisor.Value);
                         var colour = BindableBeatDivisor.GetColourFor(divisor, colours);
 
-                        bool isMainBeat = indexInBar == 0;
-
                         // even though "bar lines" take up the full vertical space, we render them in two pieces because it allows for less anchor/origin churn.
-                        float height = isMainBeat ? 0.5f : 0.4f - (float)divisor / highestDivisor * 0.2f;
-                        float gradientOpacity = isMainBeat ? 1 : 0;
 
-                        var topPoint = getNextUsablePoint();
-                        topPoint.X = xPos;
-                        topPoint.Height = height;
-                        topPoint.Colour = ColourInfo.GradientVertical(colour, colour.Opacity(gradientOpacity));
-                        topPoint.Anchor = Anchor.TopLeft;
-                        topPoint.Origin = Anchor.TopCentre;
-
-                        var bottomPoint = getNextUsablePoint();
-                        bottomPoint.X = xPos;
-                        bottomPoint.Anchor = Anchor.BottomLeft;
-                        bottomPoint.Colour = ColourInfo.GradientVertical(colour.Opacity(gradientOpacity), colour);
-                        bottomPoint.Origin = Anchor.BottomCentre;
-                        bottomPoint.Height = height;
+                        var line = getNextUsableLine();
+                        line.X = xPos;
+                        line.Width = PointVisualisation.MAX_WIDTH * getWidth(indexInBar, divisor);
+                        line.Height = 0.9f * getHeight(indexInBar, divisor);
+                        line.Colour = colour;
                     }
 
                     beat++;
@@ -168,7 +155,7 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
 
             tickCache.Validate();
 
-            Drawable getNextUsablePoint()
+            Drawable getNextUsableLine()
             {
                 PointVisualisation point;
                 if (drawableIndex >= Count)
@@ -183,6 +170,54 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
             }
         }
 
+        private static float getWidth(int indexInBar, int divisor)
+        {
+            if (indexInBar == 0)
+                return 1;
+
+            switch (divisor)
+            {
+                case 1:
+                case 2:
+                    return 0.6f;
+
+                case 3:
+                case 4:
+                    return 0.5f;
+
+                case 6:
+                case 8:
+                    return 0.4f;
+
+                default:
+                    return 0.3f;
+            }
+        }
+
+        private static float getHeight(int indexInBar, int divisor)
+        {
+            if (indexInBar == 0)
+                return 1;
+
+            switch (divisor)
+            {
+                case 1:
+                case 2:
+                    return 0.9f;
+
+                case 3:
+                case 4:
+                    return 0.8f;
+
+                case 6:
+                case 8:
+                    return 0.7f;
+
+                default:
+                    return 0.6f;
+            }
+        }
+
         protected override void Dispose(bool isDisposing)
         {
             base.Dispose(isDisposing);

osu.Game/Screens/Edit/Editor.cs

@@ -35,6 +35,7 @@ using osu.Game.Screens.Edit.Compose;
 using osu.Game.Screens.Edit.Design;
 using osu.Game.Screens.Edit.Setup;
 using osu.Game.Screens.Edit.Timing;
+using osu.Game.Screens.Edit.Verify;
 using osu.Game.Screens.Play;
 using osu.Game.Users;
 using osuTK.Graphics;
@@ -444,6 +445,10 @@ namespace osu.Game.Screens.Edit
                     menuBar.Mode.Value = EditorScreenMode.SongSetup;
                     return true;
 
+                case GlobalAction.EditorVerifyMode:
+                    menuBar.Mode.Value = EditorScreenMode.Verify;
+                    return true;
+
                 default:
                     return false;
             }
@@ -462,7 +467,7 @@ namespace osu.Game.Screens.Edit
                 // todo: temporary. we want to be applying dim using the UserDimContainer eventually.
                 b.FadeColour(Color4.DarkGray, 500);
 
-                b.EnableUserDim.Value = false;
+                b.IgnoreUserSettings.Value = true;
                 b.BlurAmount.Value = 0;
             });
 
@@ -631,6 +636,10 @@ namespace osu.Game.Screens.Edit
                     case EditorScreenMode.Timing:
                         currentScreen = new TimingScreen();
                         break;
+
+                    case EditorScreenMode.Verify:
+                        currentScreen = new VerifyScreen();
+                        break;
                 }
 
                 LoadComponentAsync(currentScreen, newScreen =>

osu.Game/Screens/Edit/EditorScreenMode.cs

@@ -18,5 +18,8 @@ namespace osu.Game.Screens.Edit
 
         [Description("timing")]
         Timing,
+
+        [Description("verify")]
+        Verify,
     }
 }

osu.Game/Screens/Edit/EditorTable.cs

@@ -0,0 +1,140 @@
+// 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.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 osuTK.Graphics;
+
+namespace osu.Game.Screens.Edit
+{
+    public abstract class EditorTable : TableContainer
+    {
+        private const float horizontal_inset = 20;
+
+        protected const float ROW_HEIGHT = 25;
+
+        protected const int TEXT_SIZE = 14;
+
+        protected readonly FillFlowContainer<RowBackground> BackgroundFlow;
+
+        protected EditorTable()
+        {
+            RelativeSizeAxes = Axes.X;
+            AutoSizeAxes = Axes.Y;
+
+            Padding = new MarginPadding { Horizontal = horizontal_inset };
+            RowSize = new Dimension(GridSizeMode.Absolute, ROW_HEIGHT);
+
+            AddInternal(BackgroundFlow = new FillFlowContainer<RowBackground>
+            {
+                RelativeSizeAxes = Axes.Both,
+                Depth = 1f,
+                Padding = new MarginPadding { Horizontal = -horizontal_inset },
+                Margin = new MarginPadding { Top = ROW_HEIGHT }
+            });
+        }
+
+        protected override Drawable CreateHeader(int index, TableColumn column) => new HeaderText(column?.Header ?? string.Empty);
+
+        private class HeaderText : OsuSpriteText
+        {
+            public HeaderText(string text)
+            {
+                Text = text.ToUpper();
+                Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold);
+            }
+        }
+
+        public class RowBackground : OsuClickableContainer
+        {
+            public readonly object Item;
+
+            private const int fade_duration = 100;
+
+            private readonly Box hoveredBackground;
+
+            [Resolved]
+            private EditorClock clock { get; set; }
+
+            public RowBackground(object item)
+            {
+                Item = item;
+
+                RelativeSizeAxes = Axes.X;
+                Height = 25;
+
+                AlwaysPresent = true;
+
+                CornerRadius = 3;
+                Masking = true;
+
+                Children = new Drawable[]
+                {
+                    hoveredBackground = new Box
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Alpha = 0,
+                    },
+                };
+
+                // todo delete
+                Action = () =>
+                {
+                };
+            }
+
+            private Color4 colourHover;
+            private Color4 colourSelected;
+
+            [BackgroundDependencyLoader]
+            private void load(OsuColour colours)
+            {
+                hoveredBackground.Colour = colourHover = colours.BlueDarker;
+                colourSelected = colours.YellowDarker;
+            }
+
+            private bool selected;
+
+            public bool Selected
+            {
+                get => selected;
+                set
+                {
+                    if (value == selected)
+                        return;
+
+                    selected = value;
+                    updateState();
+                }
+            }
+
+            protected override bool OnHover(HoverEvent e)
+            {
+                updateState();
+                return base.OnHover(e);
+            }
+
+            protected override void OnHoverLost(HoverLostEvent e)
+            {
+                updateState();
+                base.OnHoverLost(e);
+            }
+
+            private void updateState()
+            {
+                hoveredBackground.FadeColour(selected ? colourSelected : colourHover, 450, Easing.OutQuint);
+
+                if (selected || IsHovered)
+                    hoveredBackground.FadeIn(fade_duration, Easing.OutQuint);
+                else
+                    hoveredBackground.FadeOut(fade_duration, Easing.OutQuint);
+            }
+        }
+    }
+}

osu.Game/Screens/Edit/Timing/ControlPointTable.cs

@@ -8,59 +8,43 @@ using osu.Framework.Bindables;
 using osu.Framework.Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Shapes;
-using osu.Framework.Input.Events;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Extensions;
 using osu.Game.Graphics;
-using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.Sprites;
 using osuTK;
 using osuTK.Graphics;
 
 namespace osu.Game.Screens.Edit.Timing
 {
-    public class ControlPointTable : TableContainer
+    public class ControlPointTable : EditorTable
     {
-        private const float horizontal_inset = 20;
-        private const float row_height = 25;
-        private const int text_size = 14;
-
-        private readonly FillFlowContainer backgroundFlow;
-
         [Resolved]
         private Bindable<ControlPointGroup> selectedGroup { get; set; }
 
-        public ControlPointTable()
-        {
-            RelativeSizeAxes = Axes.X;
-            AutoSizeAxes = Axes.Y;
-
-            Padding = new MarginPadding { Horizontal = horizontal_inset };
-            RowSize = new Dimension(GridSizeMode.Absolute, row_height);
-
-            AddInternal(backgroundFlow = new FillFlowContainer
-            {
-                RelativeSizeAxes = Axes.Both,
-                Depth = 1f,
-                Padding = new MarginPadding { Horizontal = -horizontal_inset },
-                Margin = new MarginPadding { Top = row_height }
-            });
-        }
+        [Resolved]
+        private EditorClock clock { get; set; }
 
         public IEnumerable<ControlPointGroup> ControlGroups
         {
             set
             {
                 Content = null;
-                backgroundFlow.Clear();
+                BackgroundFlow.Clear();
 
                 if (value?.Any() != true)
                     return;
 
                 foreach (var group in value)
                 {
-                    backgroundFlow.Add(new RowBackground(group));
+                    BackgroundFlow.Add(new RowBackground(group)
+                    {
+                        Action = () =>
+                        {
+                            selectedGroup.Value = group;
+                            clock.SeekSmoothlyTo(group.Time);
+                        }
+                    });
                 }
 
                 Columns = createHeaders();
@@ -68,6 +52,16 @@ namespace osu.Game.Screens.Edit.Timing
             }
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            selectedGroup.BindValueChanged(group =>
+            {
+                foreach (var b in BackgroundFlow) b.Selected = b.Item == group.NewValue;
+            }, true);
+        }
+
         private TableColumn[] createHeaders()
         {
             var columns = new List<TableColumn>
@@ -86,13 +80,13 @@ namespace osu.Game.Screens.Edit.Timing
             new OsuSpriteText
             {
                 Text = $"#{index + 1}",
-                Font = OsuFont.GetFont(size: text_size, weight: FontWeight.Bold),
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Bold),
                 Margin = new MarginPadding(10)
             },
             new OsuSpriteText
             {
                 Text = group.Time.ToEditorFormattedString(),
-                Font = OsuFont.GetFont(size: text_size, weight: FontWeight.Bold)
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Bold)
             },
             null,
             new ControlGroupAttributes(group),
@@ -163,111 +157,5 @@ namespace osu.Game.Screens.Edit.Timing
                 return null;
             }
         }
-
-        protected override Drawable CreateHeader(int index, TableColumn column) => new HeaderText(column?.Header ?? string.Empty);
-
-        private class HeaderText : OsuSpriteText
-        {
-            public HeaderText(string text)
-            {
-                Text = text.ToUpper();
-                Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold);
-            }
-        }
-
-        public class RowBackground : OsuClickableContainer
-        {
-            private readonly ControlPointGroup controlGroup;
-            private const int fade_duration = 100;
-
-            private readonly Box hoveredBackground;
-
-            [Resolved]
-            private EditorClock clock { get; set; }
-
-            [Resolved]
-            private Bindable<ControlPointGroup> selectedGroup { get; set; }
-
-            public RowBackground(ControlPointGroup controlGroup)
-            {
-                this.controlGroup = controlGroup;
-                RelativeSizeAxes = Axes.X;
-                Height = 25;
-
-                AlwaysPresent = true;
-
-                CornerRadius = 3;
-                Masking = true;
-
-                Children = new Drawable[]
-                {
-                    hoveredBackground = new Box
-                    {
-                        RelativeSizeAxes = Axes.Both,
-                        Alpha = 0,
-                    },
-                };
-
-                Action = () =>
-                {
-                    selectedGroup.Value = controlGroup;
-                    clock.SeekSmoothlyTo(controlGroup.Time);
-                };
-            }
-
-            private Color4 colourHover;
-            private Color4 colourSelected;
-
-            [BackgroundDependencyLoader]
-            private void load(OsuColour colours)
-            {
-                hoveredBackground.Colour = colourHover = colours.BlueDarker;
-                colourSelected = colours.YellowDarker;
-            }
-
-            protected override void LoadComplete()
-            {
-                base.LoadComplete();
-
-                selectedGroup.BindValueChanged(group => { Selected = controlGroup == group.NewValue; }, true);
-            }
-
-            private bool selected;
-
-            protected bool Selected
-            {
-                get => selected;
-                set
-                {
-                    if (value == selected)
-                        return;
-
-                    selected = value;
-                    updateState();
-                }
-            }
-
-            protected override bool OnHover(HoverEvent e)
-            {
-                updateState();
-                return base.OnHover(e);
-            }
-
-            protected override void OnHoverLost(HoverLostEvent e)
-            {
-                updateState();
-                base.OnHoverLost(e);
-            }
-
-            private void updateState()
-            {
-                hoveredBackground.FadeColour(selected ? colourSelected : colourHover, 450, Easing.OutQuint);
-
-                if (selected || IsHovered)
-                    hoveredBackground.FadeIn(fade_duration, Easing.OutQuint);
-                else
-                    hoveredBackground.FadeOut(fade_duration, Easing.OutQuint);
-            }
-        }
     }
 }

osu.Game/Screens/Edit/Verify/IssueSettings.cs

@@ -0,0 +1,46 @@
+// 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.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+
+namespace osu.Game.Screens.Edit.Verify
+{
+    public class IssueSettings : CompositeDrawable
+    {
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            InternalChildren = new Drawable[]
+            {
+                new Box
+                {
+                    Colour = colours.Gray3,
+                    RelativeSizeAxes = Axes.Both,
+                },
+                new OsuScrollContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Child = new FillFlowContainer
+                    {
+                        RelativeSizeAxes = Axes.X,
+                        AutoSizeAxes = Axes.Y,
+                        Direction = FillDirection.Vertical,
+                        Children = createSections()
+                    },
+                }
+            };
+        }
+
+        private IReadOnlyList<Drawable> createSections() => new Drawable[]
+        {
+        };
+    }
+}

osu.Game/Screens/Edit/Verify/IssueTable.cs

@@ -0,0 +1,128 @@
+// 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.Collections.Generic;
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Input.Bindings;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Screens.Edit.Verify
+{
+    public class IssueTable : EditorTable
+    {
+        [Resolved]
+        private Bindable<Issue> selectedIssue { get; set; }
+
+        [Resolved]
+        private EditorClock clock { get; set; }
+
+        [Resolved]
+        private EditorBeatmap editorBeatmap { get; set; }
+
+        [Resolved]
+        private Editor editor { get; set; }
+
+        public IEnumerable<Issue> Issues
+        {
+            set
+            {
+                Content = null;
+                BackgroundFlow.Clear();
+
+                if (value == null)
+                    return;
+
+                foreach (var issue in value)
+                {
+                    BackgroundFlow.Add(new RowBackground(issue)
+                    {
+                        Action = () =>
+                        {
+                            selectedIssue.Value = issue;
+
+                            if (issue.Time != null)
+                            {
+                                clock.Seek(issue.Time.Value);
+                                editor.OnPressed(GlobalAction.EditorComposeMode);
+                            }
+
+                            if (!issue.HitObjects.Any())
+                                return;
+
+                            editorBeatmap.SelectedHitObjects.Clear();
+                            editorBeatmap.SelectedHitObjects.AddRange(issue.HitObjects);
+                        },
+                    });
+                }
+
+                Columns = createHeaders();
+                Content = value.Select((g, i) => createContent(i, g)).ToArray().ToRectangular();
+            }
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            selectedIssue.BindValueChanged(issue =>
+            {
+                foreach (var b in BackgroundFlow) b.Selected = b.Item == issue.NewValue;
+            }, true);
+        }
+
+        private TableColumn[] createHeaders()
+        {
+            var columns = new List<TableColumn>
+            {
+                new TableColumn(string.Empty, Anchor.CentreLeft, new Dimension(GridSizeMode.AutoSize)),
+                new TableColumn("Type", Anchor.CentreLeft, new Dimension(GridSizeMode.AutoSize, minSize: 60)),
+                new TableColumn("Time", Anchor.CentreLeft, new Dimension(GridSizeMode.AutoSize, minSize: 60)),
+                new TableColumn("Message", Anchor.CentreLeft),
+                new TableColumn("Category", Anchor.CentreRight, new Dimension(GridSizeMode.AutoSize)),
+            };
+
+            return columns.ToArray();
+        }
+
+        private Drawable[] createContent(int index, Issue issue) => new Drawable[]
+        {
+            new OsuSpriteText
+            {
+                Text = $"#{index + 1}",
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Medium),
+                Margin = new MarginPadding { Right = 10 }
+            },
+            new OsuSpriteText
+            {
+                Text = issue.Template.Type.ToString(),
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Bold),
+                Margin = new MarginPadding { Right = 10 },
+                Colour = issue.Template.Colour
+            },
+            new OsuSpriteText
+            {
+                Text = issue.GetEditorTimestamp(),
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Bold),
+                Margin = new MarginPadding { Right = 10 },
+            },
+            new OsuSpriteText
+            {
+                Text = issue.ToString(),
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Medium)
+            },
+            new OsuSpriteText
+            {
+                Text = issue.Check.Metadata.Category.ToString(),
+                Font = OsuFont.GetFont(size: TEXT_SIZE, weight: FontWeight.Bold),
+                Margin = new MarginPadding(10)
+            }
+        };
+    }
+}

osu.Game/Screens/Edit/Verify/VerifyScreen.cs

@@ -0,0 +1,133 @@
+// 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 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.Containers;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osuTK;
+
+namespace osu.Game.Screens.Edit.Verify
+{
+    public class VerifyScreen : EditorScreen
+    {
+        [Cached]
+        private Bindable<Issue> selectedIssue = new Bindable<Issue>();
+
+        public VerifyScreen()
+            : base(EditorScreenMode.Verify)
+        {
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Child = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Padding = new MarginPadding(20),
+                Child = new GridContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    ColumnDimensions = new[]
+                    {
+                        new Dimension(),
+                        new Dimension(GridSizeMode.Absolute, 200),
+                    },
+                    Content = new[]
+                    {
+                        new Drawable[]
+                        {
+                            new IssueList(),
+                            new IssueSettings(),
+                        },
+                    }
+                }
+            };
+        }
+
+        public class IssueList : CompositeDrawable
+        {
+            private IssueTable table;
+
+            [Resolved]
+            private EditorClock clock { get; set; }
+
+            [Resolved]
+            protected EditorBeatmap Beatmap { get; private set; }
+
+            [Resolved]
+            private Bindable<Issue> selectedIssue { get; set; }
+
+            private IBeatmapVerifier rulesetVerifier;
+            private BeatmapVerifier generalVerifier;
+
+            [BackgroundDependencyLoader]
+            private void load(OsuColour colours)
+            {
+                generalVerifier = new BeatmapVerifier();
+                rulesetVerifier = Beatmap.BeatmapInfo.Ruleset?.CreateInstance()?.CreateBeatmapVerifier();
+
+                RelativeSizeAxes = Axes.Both;
+
+                InternalChildren = new Drawable[]
+                {
+                    new Box
+                    {
+                        Colour = colours.Gray0,
+                        RelativeSizeAxes = Axes.Both,
+                    },
+                    new OsuScrollContainer
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Child = table = new IssueTable(),
+                    },
+                    new FillFlowContainer
+                    {
+                        AutoSizeAxes = Axes.Both,
+                        Anchor = Anchor.BottomRight,
+                        Origin = Anchor.BottomRight,
+                        Margin = new MarginPadding(20),
+                        Children = new Drawable[]
+                        {
+                            new TriangleButton
+                            {
+                                Text = "Refresh",
+                                Action = refresh,
+                                Size = new Vector2(120, 40),
+                                Anchor = Anchor.BottomRight,
+                                Origin = Anchor.BottomRight,
+                            },
+                        }
+                    },
+                };
+            }
+
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
+
+                refresh();
+            }
+
+            private void refresh()
+            {
+                var issues = generalVerifier.Run(Beatmap);
+
+                if (rulesetVerifier != null)
+                    issues = issues.Concat(rulesetVerifier.Run(Beatmap));
+
+                table.Issues = issues
+                               .OrderBy(issue => issue.Template.Type)
+                               .ThenBy(issue => issue.Check.Metadata.Category);
+            }
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Match/Components/MatchSettingsOverlay.cs

@@ -19,6 +19,8 @@ namespace osu.Game.Screens.OnlinePlay.Match.Components
 
         protected OnlinePlayComposite Settings { get; set; }
 
+        protected override bool BlockScrollInput => false;
+
         [BackgroundDependencyLoader]
         private void load()
         {

osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/PlayerGrid.cs

@@ -0,0 +1,167 @@
+// 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.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osuTK;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Spectate
+{
+    /// <summary>
+    /// A grid of players playing the multiplayer match.
+    /// </summary>
+    public partial class PlayerGrid : CompositeDrawable
+    {
+        private const float player_spacing = 5;
+
+        /// <summary>
+        /// The currently-maximised facade.
+        /// </summary>
+        public Drawable MaximisedFacade => maximisedFacade;
+
+        private readonly Facade maximisedFacade;
+        private readonly Container paddingContainer;
+        private readonly FillFlowContainer<Facade> facadeContainer;
+        private readonly Container<Cell> cellContainer;
+
+        public PlayerGrid()
+        {
+            InternalChildren = new Drawable[]
+            {
+                paddingContainer = new Container
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Padding = new MarginPadding(player_spacing),
+                    Children = new Drawable[]
+                    {
+                        new Container
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Child = facadeContainer = new FillFlowContainer<Facade>
+                            {
+                                RelativeSizeAxes = Axes.X,
+                                AutoSizeAxes = Axes.Y,
+                                Spacing = new Vector2(player_spacing),
+                            }
+                        },
+                        maximisedFacade = new Facade { RelativeSizeAxes = Axes.Both }
+                    }
+                },
+                cellContainer = new Container<Cell> { RelativeSizeAxes = Axes.Both }
+            };
+        }
+
+        /// <summary>
+        /// Adds a new cell with content to this grid.
+        /// </summary>
+        /// <param name="content">The content the cell should contain.</param>
+        /// <exception cref="InvalidOperationException">If more than 16 cells are added.</exception>
+        public void Add(Drawable content)
+        {
+            if (cellContainer.Count == 16)
+                throw new InvalidOperationException("Only 16 cells are supported.");
+
+            int index = cellContainer.Count;
+
+            var facade = new Facade();
+            facadeContainer.Add(facade);
+
+            var cell = new Cell(index, content) { ToggleMaximisationState = toggleMaximisationState };
+            cell.SetFacade(facade);
+
+            cellContainer.Add(cell);
+        }
+
+        /// <summary>
+        /// The content added to this grid.
+        /// </summary>
+        public IEnumerable<Drawable> Content => cellContainer.OrderBy(c => c.FacadeIndex).Select(c => c.Content);
+
+        // A depth value that gets decremented every time a new instance is maximised in order to reduce underlaps.
+        private float maximisedInstanceDepth;
+
+        private void toggleMaximisationState(Cell target)
+        {
+            // Iterate through all cells to ensure only one is maximised at any time.
+            foreach (var i in cellContainer.ToList())
+            {
+                if (i == target)
+                    i.IsMaximised = !i.IsMaximised;
+                else
+                    i.IsMaximised = false;
+
+                if (i.IsMaximised)
+                {
+                    // Transfer cell to the maximised facade.
+                    i.SetFacade(maximisedFacade);
+                    cellContainer.ChangeChildDepth(i, maximisedInstanceDepth -= 0.001f);
+                }
+                else
+                {
+                    // Transfer cell back to its original facade.
+                    i.SetFacade(facadeContainer[i.FacadeIndex]);
+                }
+            }
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            // Different layouts are used for varying cell counts in order to maximise dimensions.
+            Vector2 cellsPerDimension;
+
+            switch (facadeContainer.Count)
+            {
+                case 1:
+                    cellsPerDimension = Vector2.One;
+                    break;
+
+                case 2:
+                    cellsPerDimension = new Vector2(2, 1);
+                    break;
+
+                case 3:
+                case 4:
+                    cellsPerDimension = new Vector2(2);
+                    break;
+
+                case 5:
+                case 6:
+                    cellsPerDimension = new Vector2(3, 2);
+                    break;
+
+                case 7:
+                case 8:
+                case 9:
+                    // 3 rows / 3 cols.
+                    cellsPerDimension = new Vector2(3);
+                    break;
+
+                case 10:
+                case 11:
+                case 12:
+                    // 3 rows / 4 cols.
+                    cellsPerDimension = new Vector2(4, 3);
+                    break;
+
+                default:
+                    // 4 rows / 4 cols.
+                    cellsPerDimension = new Vector2(4);
+                    break;
+            }
+
+            // Total inter-cell spacing.
+            Vector2 totalCellSpacing = player_spacing * (cellsPerDimension - Vector2.One);
+
+            Vector2 fullSize = paddingContainer.ChildSize - totalCellSpacing;
+            Vector2 cellSize = Vector2.Divide(fullSize, new Vector2(cellsPerDimension.X, cellsPerDimension.Y));
+
+            foreach (var cell in facadeContainer)
+                cell.Size = cellSize;
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/PlayerGrid_Cell.cs

@@ -0,0 +1,99 @@
+// 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 JetBrains.Annotations;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Input.Events;
+using osuTK;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Spectate
+{
+    public partial class PlayerGrid
+    {
+        /// <summary>
+        /// A cell of the grid. Contains the content and tracks to the linked facade.
+        /// </summary>
+        private class Cell : CompositeDrawable
+        {
+            /// <summary>
+            /// The index of the original facade of this cell.
+            /// </summary>
+            public readonly int FacadeIndex;
+
+            /// <summary>
+            /// The contained content.
+            /// </summary>
+            public readonly Drawable Content;
+
+            /// <summary>
+            /// An action that toggles the maximisation state of this cell.
+            /// </summary>
+            public Action<Cell> ToggleMaximisationState;
+
+            /// <summary>
+            /// Whether this cell is currently maximised.
+            /// </summary>
+            public bool IsMaximised;
+
+            private Facade facade;
+            private bool isTracking = true;
+
+            public Cell(int facadeIndex, Drawable content)
+            {
+                FacadeIndex = facadeIndex;
+
+                Origin = Anchor.Centre;
+                InternalChild = Content = content;
+            }
+
+            protected override void Update()
+            {
+                base.Update();
+
+                if (isTracking)
+                {
+                    Position = getFinalPosition();
+                    Size = getFinalSize();
+                }
+            }
+
+            /// <summary>
+            /// Makes this cell track a new facade.
+            /// </summary>
+            public void SetFacade([NotNull] Facade newFacade)
+            {
+                Facade lastFacade = facade;
+                facade = newFacade;
+
+                if (lastFacade == null || lastFacade == newFacade)
+                    return;
+
+                isTracking = false;
+
+                this.MoveTo(getFinalPosition(), 400, Easing.OutQuint).ResizeTo(getFinalSize(), 400, Easing.OutQuint)
+                    .Then()
+                    .OnComplete(_ =>
+                    {
+                        if (facade == newFacade)
+                            isTracking = true;
+                    });
+            }
+
+            private Vector2 getFinalPosition()
+            {
+                var topLeft = Parent.ToLocalSpace(facade.ToScreenSpace(Vector2.Zero));
+                return topLeft + facade.DrawSize / 2;
+            }
+
+            private Vector2 getFinalSize() => facade.DrawSize;
+
+            protected override bool OnClick(ClickEvent e)
+            {
+                ToggleMaximisationState(this);
+                return true;
+            }
+        }
+    }
+}

osu.Game/Screens/OnlinePlay/Multiplayer/Spectate/PlayerGrid_Facade.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.
+
+using osu.Framework.Graphics;
+
+namespace osu.Game.Screens.OnlinePlay.Multiplayer.Spectate
+{
+    public partial class PlayerGrid
+    {
+        /// <summary>
+        /// A facade of the grid which is used as a dummy object to store the required position/size of cells.
+        /// </summary>
+        private class Facade : Drawable
+        {
+            public Facade()
+            {
+                Anchor = Anchor.Centre;
+                Origin = Anchor.Centre;
+            }
+        }
+    }
+}

osu.Game/Screens/Play/GameplayMenuOverlay.cs

@@ -31,6 +31,8 @@ namespace osu.Game.Screens.Play
 
         protected override bool BlockNonPositionalInput => true;
 
+        protected override bool BlockScrollInput => false;
+
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => true;
 
         public Action OnRetry;

osu.Game/Screens/Play/Player.cs

@@ -764,7 +764,7 @@ namespace osu.Game.Screens.Play
 
             ApplyToBackground(b =>
             {
-                b.EnableUserDim.Value = true;
+                b.IgnoreUserSettings.Value = false;
                 b.BlurAmount.Value = 0;
 
                 // bind component bindables.
@@ -913,7 +913,7 @@ namespace osu.Game.Screens.Play
             float fadeOutDuration = instant ? 0 : 250;
             this.FadeOut(fadeOutDuration);
 
-            ApplyToBackground(b => b.EnableUserDim.Value = false);
+            ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
             storyboardReplacesBackground.Value = false;
         }
 

osu.Game/Screens/Play/PlayerLoader.cs

@@ -24,6 +24,7 @@ using osu.Game.Overlays.Notifications;
 using osu.Game.Screens.Menu;
 using osu.Game.Screens.Play.PlayerSettings;
 using osu.Game.Users;
+using osu.Game.Utils;
 using osuTK;
 using osuTK.Graphics;
 
@@ -112,6 +113,9 @@ namespace osu.Game.Screens.Play
         [Resolved]
         private AudioManager audioManager { get; set; }
 
+        [Resolved(CanBeNull = true)]
+        private BatteryInfo batteryInfo { get; set; }
+
         public PlayerLoader(Func<Player> createPlayer)
         {
             this.createPlayer = createPlayer;
@@ -121,6 +125,7 @@ namespace osu.Game.Screens.Play
         private void load(SessionStatics sessionStatics)
         {
             muteWarningShownOnce = sessionStatics.GetBindable<bool>(Static.MutedAudioNotificationShownOnce);
+            batteryWarningShownOnce = sessionStatics.GetBindable<bool>(Static.LowBatteryNotificationShownOnce);
 
             InternalChild = (content = new LogoTrackingContainer
             {
@@ -196,6 +201,7 @@ namespace osu.Game.Screens.Play
             Scheduler.Add(new ScheduledDelegate(pushWhenLoaded, Clock.CurrentTime + 1800, 0));
 
             showMuteWarningIfNeeded();
+            showBatteryWarningIfNeeded();
         }
 
         public override void OnResuming(IScreen last)
@@ -229,7 +235,7 @@ namespace osu.Game.Screens.Play
             content.ScaleTo(0.7f, 150, Easing.InQuint);
             this.FadeOut(150);
 
-            ApplyToBackground(b => b.EnableUserDim.Value = false);
+            ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
 
             BackgroundBrightnessReduction = false;
             Beatmap.Value.Track.RemoveAdjustment(AdjustableProperty.Volume, volumeAdjustment);
@@ -277,7 +283,7 @@ namespace osu.Game.Screens.Play
                 // Preview user-defined background dim and blur when hovered on the visual settings panel.
                 ApplyToBackground(b =>
                 {
-                    b.EnableUserDim.Value = true;
+                    b.IgnoreUserSettings.Value = false;
                     b.BlurAmount.Value = 0;
                 });
 
@@ -288,7 +294,7 @@ namespace osu.Game.Screens.Play
                 ApplyToBackground(b =>
                 {
                     // Returns background dim and blur to the values specified by PlayerLoader.
-                    b.EnableUserDim.Value = false;
+                    b.IgnoreUserSettings.Value = true;
                     b.BlurAmount.Value = BACKGROUND_BLUR;
                 });
 
@@ -470,5 +476,48 @@ namespace osu.Game.Screens.Play
         }
 
         #endregion
+
+        #region Low battery warning
+
+        private Bindable<bool> batteryWarningShownOnce;
+
+        private void showBatteryWarningIfNeeded()
+        {
+            if (batteryInfo == null) return;
+
+            if (!batteryWarningShownOnce.Value)
+            {
+                if (!batteryInfo.IsCharging && batteryInfo.ChargeLevel <= 0.25)
+                {
+                    notificationOverlay?.Post(new BatteryWarningNotification());
+                    batteryWarningShownOnce.Value = true;
+                }
+            }
+        }
+
+        private class BatteryWarningNotification : SimpleNotification
+        {
+            public override bool IsImportant => true;
+
+            public BatteryWarningNotification()
+            {
+                Text = "Your battery level is low! Charge your device to prevent interruptions during gameplay.";
+            }
+
+            [BackgroundDependencyLoader]
+            private void load(OsuColour colours, NotificationOverlay notificationOverlay)
+            {
+                Icon = FontAwesome.Solid.BatteryQuarter;
+                IconBackgound.Colour = colours.RedDark;
+
+                Activated = delegate
+                {
+                    notificationOverlay.Hide();
+                    return true;
+                };
+            }
+        }
+
+        #endregion
     }
 }

osu.Game/Screens/Play/SongProgress.cs

@@ -45,6 +45,8 @@ namespace osu.Game.Screens.Play
         public override bool HandleNonPositionalInput => AllowSeeking.Value;
         public override bool HandlePositionalInput => AllowSeeking.Value;
 
+        protected override bool BlockScrollInput => false;
+
         private double firstHitTime => objects.First().StartTime;
 
         private IEnumerable<HitObject> objects;

osu.Game/Screens/Play/SubmittingPlayer.cs

@@ -109,7 +109,12 @@ namespace osu.Game.Screens.Play
 
             request.Success += s =>
             {
-                score.ScoreInfo.OnlineScoreID = s.ID;
+                // For the time being, online ID responses are not really useful for anything.
+                // In addition, the IDs provided via new (lazer) endpoints are based on a different autoincrement from legacy (stable) scores.
+                //
+                // Until we better define the server-side logic behind this, let's not store the online ID to avoid potential unique constraint
+                // conflicts across various systems (ie. solo and multiplayer).
+                // score.ScoreInfo.OnlineScoreID = s.ID;
                 tcs.SetResult(true);
             };
 

osu.Game/Utils/BatteryInfo.cs

@@ -0,0 +1,18 @@
+// 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.
+
+namespace osu.Game.Utils
+{
+    /// <summary>
+    /// Provides access to the system's power status.
+    /// </summary>
+    public abstract class BatteryInfo
+    {
+        /// <summary>
+        /// The charge level of the battery, from 0 to 1.
+        /// </summary>
+        public abstract double ChargeLevel { get; }
+
+        public abstract bool IsCharging { get; }
+    }
+}

osu.Game/Utils/ModUtils.cs

@@ -3,8 +3,11 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using osu.Framework.Bindables;
+using osu.Game.Online.API;
 using osu.Game.Rulesets.Mods;
 
 #nullable enable
@@ -129,5 +132,38 @@ namespace osu.Game.Utils
             else
                 yield return mod;
         }
+
+        /// <summary>
+        /// Returns the underlying value of the given mod setting object.
+        /// Used in <see cref="APIMod"/> for serialization and equality comparison purposes.
+        /// </summary>
+        /// <param name="setting">The mod setting.</param>
+        public static object GetSettingUnderlyingValue(object setting)
+        {
+            switch (setting)
+            {
+                case Bindable<double> d:
+                    return d.Value;
+
+                case Bindable<int> i:
+                    return i.Value;
+
+                case Bindable<float> f:
+                    return f.Value;
+
+                case Bindable<bool> b:
+                    return b.Value;
+
+                case IBindable u:
+                    // A mod with unknown (e.g. enum) generic type.
+                    var valueMethod = u.GetType().GetProperty(nameof(IBindable<int>.Value));
+                    Debug.Assert(valueMethod != null);
+                    return valueMethod.GetValue(u);
+
+                default:
+                    // fall back for non-bindable cases.
+                    return setting;
+            }
+        }
     }
 }

osu.Game/osu.Game.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup Label="Project">
     <TargetFramework>netstandard2.1</TargetFramework>
     <OutputType>Library</OutputType>
@@ -29,7 +29,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="5.0.0" />
     <PackageReference Include="Microsoft.NETCore.Targets" Version="3.1.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="ppy.osu.Framework" Version="2021.410.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2021.415.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2021.412.0" />
     <PackageReference Include="Sentry" Version="3.2.0" />
     <PackageReference Include="SharpCompress" Version="0.28.1" />

osu.iOS.props

@@ -70,7 +70,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup Label="Package References">
-    <PackageReference Include="ppy.osu.Framework.iOS" Version="2021.410.0" />
+    <PackageReference Include="ppy.osu.Framework.iOS" Version="2021.415.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2021.412.0" />
   </ItemGroup>
   <!-- See https://github.com/dotnet/runtime/issues/35988 (can be removed after Xamarin uses net5.0 / net6.0) -->
@@ -93,7 +93,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.2.6" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core" Version="2.2.6" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="ppy.osu.Framework" Version="2021.410.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2021.415.0" />
     <PackageReference Include="SharpCompress" Version="0.28.1" />
     <PackageReference Include="NUnit" Version="3.12.0" />
     <PackageReference Include="SharpRaven" Version="2.4.0" />

osu.iOS/OsuGameIOS.cs

@@ -5,6 +5,8 @@ using System;
 using Foundation;
 using osu.Game;
 using osu.Game.Updater;
+using osu.Game.Utils;
+using Xamarin.Essentials;
 
 namespace osu.iOS
 {
@@ -13,5 +15,14 @@ namespace osu.iOS
         public override Version AssemblyVersion => new Version(NSBundle.MainBundle.InfoDictionary["CFBundleVersion"].ToString());
 
         protected override UpdateManager CreateUpdateManager() => new SimpleUpdateManager();
+
+        protected override BatteryInfo CreateBatteryInfo() => new IOSBatteryInfo();
+
+        private class IOSBatteryInfo : BatteryInfo
+        {
+            public override double ChargeLevel => Battery.ChargeLevel;
+
+            public override bool IsCharging => Battery.PowerSource != BatteryPowerSource.Battery;
+        }
     }
 }

osu.iOS/osu.iOS.csproj

@@ -116,5 +116,8 @@
       <Visible>false</Visible>
     </ImageAsset>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
 </Project>