Merge branch 'master' into beatmap-card/download-button

.github/dependabot.yml

@@ -5,7 +5,7 @@ updates:
   schedule:
     interval: monthly
     time: "17:00"
-  open-pull-requests-limit: 99
+  open-pull-requests-limit: 0 # disabled until https://github.com/dependabot/dependabot-core/issues/369 is resolved.
   ignore:
   - dependency-name: Microsoft.EntityFrameworkCore.Design
     versions:

.github/workflows/ci.yml

@@ -52,22 +52,29 @@ jobs:
 
   build-only-android:
     name: Build only (Android)
-    runs-on: windows-latest
+    runs-on: macos-latest
     timeout-minutes: 60
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
+      # Pin Xamarin.Android version to 11.2 for now to avoid build failures caused by a Xamarin-side regression.
+      # See: https://github.com/xamarin/xamarin-android/issues/6284
+      # This can be removed/reverted when the fix makes it to upstream and is deployed on github runners.
+      - name: Set default Xamarin SDK version
+        run: |
+            $VM_ASSETS/select-xamarin-sdk-v2.sh --mono=6.12 --android=11.2
+
       - name: Install .NET 5.0.x
         uses: actions/setup-dotnet@v1
         with:
           dotnet-version: "5.0.x"
 
-      - name: Setup MSBuild
-        uses: microsoft/setup-msbuild@v1
-
+      # Contrary to seemingly any other msbuild, msbuild running on macOS/Mono
+      # cannot accept .sln(f) files as arguments.
+      # Build just the main game for now.
       - name: Build
-        run: msbuild osu.Android.slnf /restore /p:Configuration=Debug
+        run: msbuild osu.Android/osu.Android.csproj /restore /p:Configuration=Debug
 
   build-only-ios:
     # While this workflow technically *can* run, it fails as iOS builds are blocked by multiple issues.

osu.Android.props

@@ -51,7 +51,7 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.1026.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.1112.0" />
     <PackageReference Include="ppy.osu.Framework.Android" Version="2021.1108.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">

osu.Game.Rulesets.Catch.Tests/Editor/Checks/TestCheckBananaShowerGap.cs

@@ -0,0 +1,118 @@
+// 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.Catch.Edit.Checks;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class TestCheckBananaShowerGap
+    {
+        private CheckBananaShowerGap check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckBananaShowerGap();
+        }
+
+        [Test]
+        public void TestAllowedSpinnerGaps()
+        {
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Easy);
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Normal);
+            assertOk(mockBeatmap(125, 1000, 1250), DifficultyRating.Hard);
+            assertOk(mockBeatmap(125, 1000, 1125), DifficultyRating.Insane);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.Expert);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapStart()
+        {
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Easy);
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Normal);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Hard);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Insane);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.Expert);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapEnd()
+        {
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Easy);
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Normal);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1249), DifficultyRating.Hard);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1124), DifficultyRating.Insane);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.Expert);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestConsecutiveSpinners()
+        {
+            var spinnerConsecutiveBeatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new BananaShower { StartTime = 0, EndTime = 100, X = 0 },
+                    new BananaShower { StartTime = 101, EndTime = 200, X = 0 },
+                    new BananaShower { StartTime = 201, EndTime = 300, X = 0 }
+                }
+            };
+
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Easy);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Normal);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Hard);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Insane);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Expert);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.ExpertPlus);
+        }
+
+        private Beatmap<HitObject> mockBeatmap(double bananaShowerStart, double bananaShowerEnd, double nextFruitStart)
+        {
+            return new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Fruit { StartTime = 0, X = 0 },
+                    new BananaShower { StartTime = bananaShowerStart, EndTime = bananaShowerEnd, X = 0 },
+                    new Fruit { StartTime = nextFruitStart, X = 0 }
+                }
+            };
+        }
+
+        private void assertOk(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            Assert.That(check.Run(context), Is.Empty);
+        }
+
+        private void assertTooShortSpinnerStart(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerStartGap));
+        }
+
+        private void assertTooShortSpinnerEnd(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerEndGap));
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Mods/TestSceneCatchModNoScope.cs

@@ -0,0 +1,110 @@
+// 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 NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Timing;
+using osu.Game.Rulesets.Catch.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Catch.Tests.Mods
+{
+    public class TestSceneCatchModNoScope : ModTestScene
+    {
+        protected override Ruleset CreatePlayerRuleset() => new CatchRuleset();
+
+        [Test]
+        public void TestVisibleDuringBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 0 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 5000,
+                        }
+                    },
+                    Breaks = new List<BreakPeriod>
+                    {
+                        new BreakPeriod(2000, 4000),
+                    }
+                }
+            });
+
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+            AddUntilStep("wait for start of break", isBreak);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for end of break", () => !isBreak());
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+        }
+
+        [Test]
+        public void TestVisibleAfterComboBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 2 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = 0,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 3000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.WIDTH,
+                            StartTime = 5000,
+                        },
+                    }
+                }
+            });
+
+            AddAssert("catcher must start visible", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for combo", () => Player.ScoreProcessor.Combo.Value >= 2);
+            AddAssert("catcher must dim after combo", () => !catcherAlphaAlmostEquals(1));
+            AddStep("break combo", () => Player.ScoreProcessor.Combo.Value = 0);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+        }
+
+        private bool isBreak() => Player.IsBreakTime.Value;
+
+        private bool catcherAlphaAlmostEquals(float alpha)
+        {
+            var playfield = (CatchPlayfield)Player.DrawableRuleset.Playfield;
+            return Precision.AlmostEquals(playfield.CatcherArea.Alpha, alpha);
+        }
+    }
+}

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -133,6 +133,7 @@ namespace osu.Game.Rulesets.Catch
                         new MultiMod(new ModWindUp(), new ModWindDown()),
                         new CatchModFloatingFruits(),
                         new CatchModMuted(),
+                        new CatchModNoScope(),
                     };
 
                 default:
@@ -188,5 +189,7 @@ namespace osu.Game.Rulesets.Catch
         public override IConvertibleReplayFrame CreateConvertibleReplayFrame() => new CatchReplayFrame();
 
         public override HitObjectComposer CreateHitObjectComposer() => new CatchHitObjectComposer(this);
+
+        public override IBeatmapVerifier CreateBeatmapVerifier() => new CatchBeatmapVerifier();
     }
 }

osu.Game.Rulesets.Catch/Edit/CatchBeatmapVerifier.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.Rulesets.Catch.Edit.Checks;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    public class CatchBeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckBananaShowerGap()
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            return checks.SelectMany(check => check.Run(context));
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Checks/CheckBananaShowerGap.cs

@@ -0,0 +1,102 @@
+// 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 osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Catch.Edit.Checks
+{
+    /// <summary>
+    /// Check the spinner/banana shower gaps specified in the osu!catch difficulty specific ranking criteria.
+    /// </summary>
+    public class CheckBananaShowerGap : ICheck
+    {
+        private static readonly Dictionary<DifficultyRating, (int startGap, int endGap)> spinner_delta_threshold = new Dictionary<DifficultyRating, (int, int)>
+        {
+            [DifficultyRating.Easy] = (250, 250),
+            [DifficultyRating.Normal] = (250, 250),
+            [DifficultyRating.Hard] = (125, 250),
+            [DifficultyRating.Insane] = (125, 125),
+            [DifficultyRating.Expert] = (62, 125),
+            [DifficultyRating.ExpertPlus] = (62, 125)
+        };
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Too short spinner gap");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateBananaShowerStartGap(this),
+            new IssueTemplateBananaShowerEndGap(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            var hitObjects = context.Beatmap.HitObjects;
+            (int expectedStartDelta, int expectedEndDelta) = spinner_delta_threshold[context.InterpretedDifficulty];
+
+            for (int i = 0; i < hitObjects.Count - 1; ++i)
+            {
+                if (!(hitObjects[i] is BananaShower bananaShower))
+                    continue;
+
+                // Skip if the previous hitobject is a banana shower, consecutive spinners are allowed
+                if (i != 0 && hitObjects[i - 1] is CatchHitObject previousHitObject && !(previousHitObject is BananaShower))
+                {
+                    double spinnerStartDelta = bananaShower.StartTime - previousHitObject.GetEndTime();
+
+                    if (spinnerStartDelta < expectedStartDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerStartGap(this)
+                            .Create(spinnerStartDelta, expectedStartDelta, bananaShower, previousHitObject);
+                    }
+                }
+
+                // Skip if the next hitobject is a banana shower, consecutive spinners are allowed
+                if (hitObjects[i + 1] is CatchHitObject nextHitObject && !(nextHitObject is BananaShower))
+                {
+                    double spinnerEndDelta = nextHitObject.StartTime - bananaShower.EndTime;
+
+                    if (spinnerEndDelta < expectedEndDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerEndGap(this)
+                            .Create(spinnerEndDelta, expectedEndDelta, bananaShower, nextHitObject);
+                    }
+                }
+            }
+        }
+
+        public abstract class IssueTemplateBananaShowerGap : IssueTemplate
+        {
+            protected IssueTemplateBananaShowerGap(ICheck check, IssueType issueType, string unformattedMessage)
+                : base(check, issueType, unformattedMessage)
+            {
+            }
+
+            public Issue Create(double deltaTime, int expectedDeltaTime, params HitObject[] hitObjects)
+            {
+                return new Issue(hitObjects, this, Math.Floor(deltaTime), expectedDeltaTime);
+            }
+        }
+
+        public class IssueTemplateBananaShowerStartGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerStartGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the start of the spinner and the last object, it should not be less than {1} ms.")
+            {
+            }
+        }
+
+        public class IssueTemplateBananaShowerEndGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerEndGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the end of the spinner and the next object, it should not be less than {1} ms.")
+            {
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModNoScope.cs

@@ -0,0 +1,40 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Bindables;
+using osu.Game.Rulesets.Mods;
+using osu.Framework.Utils;
+using osu.Game.Configuration;
+using osu.Game.Overlays.Settings;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.UI;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModNoScope : ModNoScope, IUpdatableByPlayfield
+    {
+        public override string Description => "Where's the catcher?";
+
+        [SettingSource(
+            "Hidden at combo",
+            "The combo count at which the catcher becomes completely hidden",
+            SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
+        )]
+        public override BindableInt HiddenComboCount { get; } = new BindableInt
+        {
+            Default = 10,
+            Value = 10,
+            MinValue = 0,
+            MaxValue = 50,
+        };
+
+        public void Update(Playfield playfield)
+        {
+            var catchPlayfield = (CatchPlayfield)playfield;
+            bool shouldAlwaysShowCatcher = IsBreakTime.Value;
+            float targetAlpha = shouldAlwaysShowCatcher ? 1 : ComboBasedAlpha;
+            catchPlayfield.CatcherArea.Alpha = (float)Interpolation.Lerp(catchPlayfield.CatcherArea.Alpha, targetAlpha, Math.Clamp(catchPlayfield.Time.Elapsed / TRANSITION_DURATION, 0, 1));
+        }
+    }
+}

osu.Game.Rulesets.Mania.Tests/Editor/TestSceneManiaComposeScreen.cs

@@ -22,6 +22,9 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
         [Resolved]
         private SkinManager skins { get; set; }
 
+        [Cached]
+        private EditorClipboard clipboard = new EditorClipboard();
+
         [SetUpSteps]
         public void SetUpSteps()
         {

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

@@ -0,0 +1,185 @@
+// 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.Utils;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Screens.Edit;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor
+{
+    public class TestSceneSliderStreamConversion : TestSceneOsuEditor
+    {
+        private BindableBeatDivisor beatDivisor => (BindableBeatDivisor)Editor.Dependencies.Get(typeof(BindableBeatDivisor));
+
+        [Test]
+        public void TestSimpleConversion()
+        {
+            Slider slider = null;
+
+            AddStep("select first slider", () =>
+            {
+                slider = (Slider)EditorBeatmap.HitObjects.First(h => h is Slider);
+                EditorClock.Seek(slider.StartTime);
+                EditorBeatmap.SelectedHitObjects.Add(slider);
+            });
+
+            convertToStream();
+
+            AddAssert("stream created", () => streamCreatedFor(slider,
+                (time: 0, pathPosition: 0),
+                (time: 0.25, pathPosition: 0.25),
+                (time: 0.5, pathPosition: 0.5),
+                (time: 0.75, pathPosition: 0.75),
+                (time: 1, pathPosition: 1)));
+
+            AddStep("undo", () => Editor.Undo());
+            AddAssert("slider restored", () => sliderRestored(slider));
+
+            AddStep("select first slider", () =>
+            {
+                slider = (Slider)EditorBeatmap.HitObjects.First(h => h is Slider);
+                EditorClock.Seek(slider.StartTime);
+                EditorBeatmap.SelectedHitObjects.Add(slider);
+            });
+            AddStep("change beat divisor", () => beatDivisor.Value = 8);
+
+            convertToStream();
+            AddAssert("stream created", () => streamCreatedFor(slider,
+                (time: 0, pathPosition: 0),
+                (time: 0.125, pathPosition: 0.125),
+                (time: 0.25, pathPosition: 0.25),
+                (time: 0.375, pathPosition: 0.375),
+                (time: 0.5, pathPosition: 0.5),
+                (time: 0.625, pathPosition: 0.625),
+                (time: 0.75, pathPosition: 0.75),
+                (time: 0.875, pathPosition: 0.875),
+                (time: 1, pathPosition: 1)));
+        }
+
+        [Test]
+        public void TestConversionWithNonMatchingDivisor()
+        {
+            Slider slider = null;
+
+            AddStep("select second slider", () =>
+            {
+                slider = (Slider)EditorBeatmap.HitObjects.Where(h => h is Slider).ElementAt(1);
+                EditorClock.Seek(slider.StartTime);
+                EditorBeatmap.SelectedHitObjects.Add(slider);
+            });
+            AddStep("change beat divisor", () => beatDivisor.Value = 3);
+
+            convertToStream();
+
+            AddAssert("stream created", () => streamCreatedFor(slider,
+                (time: 0, pathPosition: 0),
+                (time: 2 / 3d, pathPosition: 2 / 3d)));
+        }
+
+        [Test]
+        public void TestConversionWithRepeats()
+        {
+            Slider slider = null;
+
+            AddStep("select first slider with repeats", () =>
+            {
+                slider = (Slider)EditorBeatmap.HitObjects.First(h => h is Slider s && s.RepeatCount > 0);
+                EditorClock.Seek(slider.StartTime);
+                EditorBeatmap.SelectedHitObjects.Add(slider);
+            });
+            AddStep("change beat divisor", () => beatDivisor.Value = 2);
+
+            convertToStream();
+
+            AddAssert("stream created", () => streamCreatedFor(slider,
+                (time: 0, pathPosition: 0),
+                (time: 0.25, pathPosition: 0.5),
+                (time: 0.5, pathPosition: 1),
+                (time: 0.75, pathPosition: 0.5),
+                (time: 1, pathPosition: 0)));
+        }
+
+        [Test]
+        public void TestConversionPreservesSliderProperties()
+        {
+            Slider slider = null;
+
+            AddStep("select second new-combo-starting slider", () =>
+            {
+                slider = (Slider)EditorBeatmap.HitObjects.Where(h => h is Slider s && s.NewCombo).ElementAt(1);
+                EditorClock.Seek(slider.StartTime);
+                EditorBeatmap.SelectedHitObjects.Add(slider);
+            });
+
+            convertToStream();
+
+            AddAssert("stream created", () => streamCreatedFor(slider,
+                (time: 0, pathPosition: 0),
+                (time: 0.25, pathPosition: 0.25),
+                (time: 0.5, pathPosition: 0.5),
+                (time: 0.75, pathPosition: 0.75),
+                (time: 1, pathPosition: 1)));
+
+            AddStep("undo", () => Editor.Undo());
+            AddAssert("slider restored", () => sliderRestored(slider));
+        }
+
+        private void convertToStream()
+        {
+            AddStep("convert to stream", () =>
+            {
+                InputManager.PressKey(Key.LControl);
+                InputManager.PressKey(Key.LShift);
+                InputManager.Key(Key.F);
+                InputManager.ReleaseKey(Key.LShift);
+                InputManager.ReleaseKey(Key.LControl);
+            });
+        }
+
+        private bool streamCreatedFor(Slider slider, params (double time, double pathPosition)[] expectedCircles)
+        {
+            if (EditorBeatmap.HitObjects.Contains(slider))
+                return false;
+
+            foreach ((double expectedTime, double expectedPathPosition) in expectedCircles)
+            {
+                double time = slider.StartTime + slider.Duration * expectedTime;
+                Vector2 position = slider.Position + slider.Path.PositionAt(expectedPathPosition);
+
+                if (!EditorBeatmap.HitObjects.OfType<HitCircle>().Any(h => matches(h, time, position, slider.NewCombo && expectedTime == 0)))
+                    return false;
+            }
+
+            return true;
+
+            bool matches(HitCircle circle, double time, Vector2 position, bool startsNewCombo) =>
+                Precision.AlmostEquals(circle.StartTime, time, 1)
+                && Precision.AlmostEquals(circle.Position, position, 0.01f)
+                && circle.NewCombo == startsNewCombo
+                && circle.Samples.SequenceEqual(slider.HeadCircle.Samples)
+                && circle.SampleControlPoint.IsRedundant(slider.SampleControlPoint);
+        }
+
+        private bool sliderRestored(Slider slider)
+        {
+            var objects = EditorBeatmap.HitObjects.Where(h => h.StartTime >= slider.StartTime && h.GetEndTime() <= slider.EndTime).ToList();
+
+            if (objects.Count > 1)
+                return false;
+
+            var hitObject = objects.Single();
+            if (!(hitObject is Slider restoredSlider))
+                return false;
+
+            return Precision.AlmostEquals(slider.StartTime, restoredSlider.StartTime)
+                   && Precision.AlmostEquals(slider.GetEndTime(), restoredSlider.GetEndTime())
+                   && Precision.AlmostEquals(slider.Position, restoredSlider.Position, 0.01f)
+                   && Precision.AlmostEquals(slider.EndPosition, restoredSlider.EndPosition, 0.01f);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Mods/TestSceneOsuModNoScope.cs

@@ -137,7 +137,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Mods
             AddAssert("cursor must start visible", () => cursorAlphaAlmostEquals(1));
             AddUntilStep("wait for combo", () => Player.ScoreProcessor.Combo.Value >= 2);
             AddAssert("cursor must dim after combo", () => !cursorAlphaAlmostEquals(1));
-            AddStep("break combo", () => Player.ScoreProcessor.Combo.Set(0));
+            AddStep("break combo", () => Player.ScoreProcessor.Combo.Value = 0);
             AddUntilStep("wait for cursor to show", () => cursorAlphaAlmostEquals(1));
         }
 

osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs

@@ -15,13 +15,13 @@ namespace osu.Game.Rulesets.Osu.Tests
     {
         protected override string ResourceAssembly => "osu.Game.Rulesets.Osu";
 
-        [TestCase(6.6975550434910005d, "diffcalc-test")]
-        [TestCase(1.4670676815251105d, "zero-length-sliders")]
+        [TestCase(6.6972307565739273d, "diffcalc-test")]
+        [TestCase(1.4484754139145539d, "zero-length-sliders")]
         public void Test(double expected, string name)
             => base.Test(expected, name);
 
-        [TestCase(8.9389769779826267d, "diffcalc-test")]
-        [TestCase(1.7786917985891204d, "zero-length-sliders")]
+        [TestCase(8.9382559208689809d, "diffcalc-test")]
+        [TestCase(1.7548875851757628d, "zero-length-sliders")]
         public void TestClockRateAdjusted(double expected, string name)
             => Test(expected, name, new OsuModDoubleTime());
 

osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs

@@ -10,6 +10,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
         public double AimStrain { get; set; }
         public double SpeedStrain { get; set; }
         public double FlashlightRating { get; set; }
+        public double SliderFactor { get; set; }
         public double ApproachRate { get; set; }
         public double OverallDifficulty { get; set; }
         public double DrainRate { get; set; }

osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs

@@ -34,8 +34,11 @@ namespace osu.Game.Rulesets.Osu.Difficulty
                 return new OsuDifficultyAttributes { Mods = mods, Skills = skills };
 
             double aimRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier;
-            double speedRating = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
-            double flashlightRating = Math.Sqrt(skills[2].DifficultyValue()) * difficulty_multiplier;
+            double aimRatingNoSliders = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
+            double speedRating = Math.Sqrt(skills[2].DifficultyValue()) * difficulty_multiplier;
+            double flashlightRating = Math.Sqrt(skills[3].DifficultyValue()) * difficulty_multiplier;
+
+            double sliderFactor = aimRating > 0 ? aimRatingNoSliders / aimRating : 1;
 
             if (mods.Any(h => h is OsuModRelax))
                 speedRating = 0.0;
@@ -74,6 +77,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
                 AimStrain = aimRating,
                 SpeedStrain = speedRating,
                 FlashlightRating = flashlightRating,
+                SliderFactor = sliderFactor,
                 ApproachRate = preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5,
                 OverallDifficulty = (80 - hitWindowGreat) / 6,
                 DrainRate = drainRate,
@@ -108,7 +112,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
 
             return new Skill[]
             {
-                new Aim(mods),
+                new Aim(mods, true),
+                new Aim(mods, false),
                 new Speed(mods, hitWindowGreat),
                 new Flashlight(mods)
             };

osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs

@@ -125,6 +125,16 @@ namespace osu.Game.Rulesets.Osu.Difficulty
                 aimValue *= 1.0 + 0.04 * (12.0 - Attributes.ApproachRate);
             }
 
+            // We assume 15% of sliders in a map are difficult since there's no way to tell from the performance calculator.
+            double estimateDifficultSliders = Attributes.SliderCount * 0.15;
+
+            if (Attributes.SliderCount > 0)
+            {
+                double estimateSliderEndsDropped = Math.Clamp(Math.Min(countOk + countMeh + countMiss, Attributes.MaxCombo - scoreMaxCombo), 0, estimateDifficultSliders);
+                double sliderNerfFactor = (1 - Attributes.SliderFactor) * Math.Pow(1 - estimateSliderEndsDropped / estimateDifficultSliders, 3) + Attributes.SliderFactor;
+                aimValue *= sliderNerfFactor;
+            }
+
             aimValue *= accuracy;
             // It is important to also consider accuracy difficulty when doing that.
             aimValue *= 0.98 + Math.Pow(Attributes.OverallDifficulty, 2) / 2500;

osu.Game.Rulesets.Osu/Difficulty/Preprocessing/OsuDifficultyHitObject.cs

@@ -14,7 +14,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
         private const int normalized_radius = 50; // Change radius to 50 to make 100 the diameter. Easier for mental maths.
         private const int min_delta_time = 25;
         private const float maximum_slider_radius = normalized_radius * 2.4f;
-        private const float assumed_slider_radius = normalized_radius * 1.65f;
+        private const float assumed_slider_radius = normalized_radius * 1.8f;
 
         protected new OsuHitObject BaseObject => (OsuHitObject)base.BaseObject;
 

osu.Game.Rulesets.Osu/Difficulty/Skills/Aim.cs

@@ -14,11 +14,14 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
     /// </summary>
     public class Aim : OsuStrainSkill
     {
-        public Aim(Mod[] mods)
+        public Aim(Mod[] mods, bool withSliders)
             : base(mods)
         {
+            this.withSliders = withSliders;
         }
 
+        private readonly bool withSliders;
+
         protected override int HistoryLength => 2;
 
         private const double wide_angle_multiplier = 1.5;
@@ -44,7 +47,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
             double currVelocity = osuCurrObj.JumpDistance / osuCurrObj.StrainTime;
 
             // But if the last object is a slider, then we extend the travel velocity through the slider into the current object.
-            if (osuLastObj.BaseObject is Slider)
+            if (osuLastObj.BaseObject is Slider && withSliders)
             {
                 double movementVelocity = osuCurrObj.MovementDistance / osuCurrObj.MovementTime; // calculate the movement velocity from slider end to current object
                 double travelVelocity = osuCurrObj.TravelDistance / osuCurrObj.TravelTime; // calculate the slider velocity from slider head to slider end.
@@ -55,7 +58,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
             // As above, do the same for the previous hitobject.
             double prevVelocity = osuLastObj.JumpDistance / osuLastObj.StrainTime;
 
-            if (osuLastLastObj.BaseObject is Slider)
+            if (osuLastLastObj.BaseObject is Slider && withSliders)
             {
                 double movementVelocity = osuLastObj.MovementDistance / osuLastObj.MovementTime;
                 double travelVelocity = osuLastObj.TravelDistance / osuLastObj.TravelTime;
@@ -135,7 +138,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
             aimStrain += Math.Max(acuteAngleBonus * acute_angle_multiplier, wideAngleBonus * wide_angle_multiplier + velocityChangeBonus * velocity_change_multiplier);
 
             // Add in additional slider velocity bonus.
-            aimStrain += sliderBonus * slider_multiplier;
+            if (withSliders)
+                aimStrain += sliderBonus * slider_multiplier;
 
             return aimStrain;
         }

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderSelectionBlueprint.cs

@@ -11,9 +11,12 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Primitives;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input.Events;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
@@ -47,6 +50,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
         [Resolved(CanBeNull = true)]
         private IEditorChangeHandler changeHandler { get; set; }
 
+        [Resolved(CanBeNull = true)]
+        private BindableBeatDivisor beatDivisor { get; set; }
+
         public override Quad SelectionQuad => BodyPiece.ScreenSpaceDrawQuad;
 
         private readonly BindableList<PathControlPoint> controlPoints = new BindableList<PathControlPoint>();
@@ -173,6 +179,20 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
             }
         }
 
+        protected override bool OnKeyDown(KeyDownEvent e)
+        {
+            if (!IsSelected)
+                return false;
+
+            if (e.Key == Key.F && e.ControlPressed && e.ShiftPressed)
+            {
+                convertToStream();
+                return true;
+            }
+
+            return false;
+        }
+
         private int addControlPoint(Vector2 position)
         {
             position -= HitObject.Position;
@@ -234,9 +254,56 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
             editorBeatmap?.Update(HitObject);
         }
 
+        private void convertToStream()
+        {
+            if (editorBeatmap == null || changeHandler == null || beatDivisor == null)
+                return;
+
+            var timingPoint = editorBeatmap.ControlPointInfo.TimingPointAt(HitObject.StartTime);
+            double streamSpacing = timingPoint.BeatLength / beatDivisor.Value;
+
+            changeHandler.BeginChange();
+
+            int i = 0;
+            double time = HitObject.StartTime;
+
+            while (!Precision.DefinitelyBigger(time, HitObject.GetEndTime(), 1))
+            {
+                // positionWithRepeats is a fractional number in the range of [0, HitObject.SpanCount()]
+                // and indicates how many fractional spans of a slider have passed up to time.
+                double positionWithRepeats = (time - HitObject.StartTime) / HitObject.Duration * HitObject.SpanCount();
+                double pathPosition = positionWithRepeats - (int)positionWithRepeats;
+                // every second span is in the reverse direction - need to reverse the path position.
+                if (Precision.AlmostBigger(positionWithRepeats % 2, 1))
+                    pathPosition = 1 - pathPosition;
+
+                Vector2 position = HitObject.Position + HitObject.Path.PositionAt(pathPosition);
+
+                var samplePoint = (SampleControlPoint)HitObject.SampleControlPoint.DeepClone();
+                samplePoint.Time = time;
+
+                editorBeatmap.Add(new HitCircle
+                {
+                    StartTime = time,
+                    Position = position,
+                    NewCombo = i == 0 && HitObject.NewCombo,
+                    SampleControlPoint = samplePoint,
+                    Samples = HitObject.HeadCircle.Samples.Select(s => s.With()).ToList()
+                });
+
+                i += 1;
+                time = HitObject.StartTime + i * streamSpacing;
+            }
+
+            editorBeatmap.Remove(HitObject);
+
+            changeHandler.EndChange();
+        }
+
         public override MenuItem[] ContextMenuItems => new MenuItem[]
         {
             new OsuMenuItem("Add control point", MenuItemType.Standard, () => addControlPoint(rightClickPosition)),
+            new OsuMenuItem("Convert to stream", MenuItemType.Destructive, convertToStream),
         };
 
         // Always refer to the drawable object's slider body so subsequent movement deltas are calculated with updated positions.

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

@@ -4,52 +4,29 @@
 using System;
 using System.Linq;
 using osu.Framework.Bindables;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Sprites;
-using osu.Framework.Localisation;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
-using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Settings;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.UI;
-using osu.Game.Rulesets.Scoring;
-using osu.Game.Scoring;
-using osu.Game.Screens.Play;
 using osu.Game.Utils;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
-    public class OsuModNoScope : Mod, IUpdatableByPlayfield, IApplicableToScoreProcessor, IApplicableToPlayer, IApplicableToBeatmap
+    public class OsuModNoScope : ModNoScope, IUpdatableByPlayfield, IApplicableToBeatmap
     {
-        /// <summary>
-        /// Slightly higher than the cutoff for <see cref="Drawable.IsPresent"/>.
-        /// </summary>
-        private const float min_alpha = 0.0002f;
-
-        private const float transition_duration = 100;
-
-        public override string Name => "No Scope";
-        public override string Acronym => "NS";
-        public override ModType Type => ModType.Fun;
-        public override IconUsage? Icon => FontAwesome.Solid.EyeSlash;
         public override string Description => "Where's the cursor?";
-        public override double ScoreMultiplier => 1;
 
-        private BindableNumber<int> currentCombo;
-        private IBindable<bool> isBreakTime;
         private PeriodTracker spinnerPeriods;
 
-        private float comboBasedAlpha;
-
         [SettingSource(
             "Hidden at combo",
             "The combo count at which the cursor becomes completely hidden",
             SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
         )]
-        public BindableInt HiddenComboCount { get; } = new BindableInt
+        public override BindableInt HiddenComboCount { get; } = new BindableInt
         {
             Default = 10,
             Value = 10,
@@ -57,39 +34,16 @@ namespace osu.Game.Rulesets.Osu.Mods
             MaxValue = 50,
         };
 
-        public ScoreRank AdjustRank(ScoreRank rank, double accuracy) => rank;
-
-        public void ApplyToPlayer(Player player)
-        {
-            isBreakTime = player.IsBreakTime.GetBoundCopy();
-        }
-
         public void ApplyToBeatmap(IBeatmap beatmap)
         {
-            spinnerPeriods = new PeriodTracker(beatmap.HitObjects.OfType<Spinner>().Select(b => new Period(b.StartTime - transition_duration, b.EndTime)));
+            spinnerPeriods = new PeriodTracker(beatmap.HitObjects.OfType<Spinner>().Select(b => new Period(b.StartTime - TRANSITION_DURATION, b.EndTime)));
         }
 
-        public void ApplyToScoreProcessor(ScoreProcessor scoreProcessor)
+        public void Update(Playfield playfield)
         {
-            if (HiddenComboCount.Value == 0) return;
-
-            currentCombo = scoreProcessor.Combo.GetBoundCopy();
-            currentCombo.BindValueChanged(combo =>
-            {
-                comboBasedAlpha = Math.Max(min_alpha, 1 - (float)combo.NewValue / HiddenComboCount.Value);
-            }, true);
+            bool shouldAlwaysShowCursor = IsBreakTime.Value || spinnerPeriods.IsInAny(playfield.Clock.CurrentTime);
+            float targetAlpha = shouldAlwaysShowCursor ? 1 : ComboBasedAlpha;
+            playfield.Cursor.Alpha = (float)Interpolation.Lerp(playfield.Cursor.Alpha, targetAlpha, Math.Clamp(playfield.Time.Elapsed / TRANSITION_DURATION, 0, 1));
         }
-
-        public virtual void Update(Playfield playfield)
-        {
-            bool shouldAlwaysShowCursor = isBreakTime.Value || spinnerPeriods.IsInAny(playfield.Clock.CurrentTime);
-            float targetAlpha = shouldAlwaysShowCursor ? 1 : comboBasedAlpha;
-            playfield.Cursor.Alpha = (float)Interpolation.Lerp(playfield.Cursor.Alpha, targetAlpha, Math.Clamp(playfield.Time.Elapsed / transition_duration, 0, 1));
-        }
-    }
-
-    public class HiddenComboSlider : OsuSliderBar<int>
-    {
-        public override LocalisableString TooltipText => Current.Value == 0 ? "always hidden" : base.TooltipText;
     }
 }

osu.Game.Rulesets.Taiko.Tests/Editor/TestSceneEditorSaving.cs

@@ -51,7 +51,7 @@ namespace osu.Game.Rulesets.Taiko.Tests.Editor
                 editorBeatmap.BeatmapInfo.Metadata.Artist = "artist";
                 editorBeatmap.BeatmapInfo.Metadata.Title = "title";
             });
-            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.Version = "difficulty");
+            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName = "difficulty");
 
             checkMutations();
 
@@ -85,7 +85,7 @@ namespace osu.Game.Rulesets.Taiko.Tests.Editor
                 return Precision.AlmostEquals(taikoDifficulty.SliderMultiplier, 2);
             });
             AddAssert("Beatmap has correct metadata", () => editorBeatmap.BeatmapInfo.Metadata.Artist == "artist" && editorBeatmap.BeatmapInfo.Metadata.Title == "title");
-            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.Version == "difficulty");
+            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName == "difficulty");
         }
     }
 }

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

@@ -113,11 +113,11 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 Assert.AreEqual("Soleily", metadata.Artist);
                 Assert.AreEqual("Soleily", metadata.ArtistUnicode);
                 Assert.AreEqual("Gamu", metadata.Author.Username);
-                Assert.AreEqual("Insane", beatmapInfo.Version);
+                Assert.AreEqual("Insane", beatmapInfo.DifficultyName);
                 Assert.AreEqual(string.Empty, metadata.Source);
                 Assert.AreEqual("MBC7 Unisphere 地球ヤバイEP Chikyu Yabai", metadata.Tags);
-                Assert.AreEqual(557821, beatmapInfo.OnlineBeatmapID);
-                Assert.AreEqual(241526, beatmapInfo.BeatmapSet.OnlineBeatmapSetID);
+                Assert.AreEqual(557821, beatmapInfo.OnlineID);
+                Assert.AreEqual(241526, beatmapInfo.BeatmapSet.OnlineID);
             }
         }
 

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

@@ -31,7 +31,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
         {
             var beatmap = decodeAsJson(normal);
             var meta = beatmap.BeatmapInfo.Metadata;
-            Assert.AreEqual(241526, beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID);
+            Assert.AreEqual(241526, beatmap.BeatmapInfo.BeatmapSet.OnlineID);
             Assert.AreEqual("Soleily", meta.Artist);
             Assert.AreEqual("Soleily", meta.ArtistUnicode);
             Assert.AreEqual("03. Renatus - Soleily 192kbps.mp3", meta.AudioFile);

osu.Game.Tests/Beatmaps/IO/ImportBeatmapTest.cs

@@ -18,6 +18,7 @@ using osu.Game.Beatmaps;
 using osu.Game.Database;
 using osu.Game.IO;
 using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Overlays.Notifications;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Scoring;
@@ -387,6 +388,41 @@ namespace osu.Game.Tests.Beatmaps.IO
             }
         }
 
+        [Test]
+        public async Task TestModelCreationFailureDoesntReturn()
+        {
+            using (HeadlessGameHost host = new CleanRunHeadlessGameHost(nameof(ImportBeatmapTest)))
+            {
+                try
+                {
+                    var osu = LoadOsuIntoHost(host);
+                    var importer = osu.Dependencies.Get<BeatmapManager>();
+
+                    var progressNotification = new ImportProgressNotification();
+
+                    var zipStream = new MemoryStream();
+
+                    using (var zip = ZipArchive.Create())
+                        zip.SaveTo(zipStream, new ZipWriterOptions(CompressionType.Deflate));
+
+                    var imported = await importer.Import(
+                        progressNotification,
+                        new ImportTask(zipStream, string.Empty)
+                    );
+
+                    checkBeatmapSetCount(osu, 0);
+                    checkBeatmapCount(osu, 0);
+
+                    Assert.IsEmpty(imported);
+                    Assert.AreEqual(ProgressNotificationState.Cancelled, progressNotification.State);
+                }
+                finally
+                {
+                    host.Exit();
+                }
+            }
+        }
+
         [Test]
         public async Task TestRollbackOnFailure()
         {
@@ -506,7 +542,7 @@ namespace osu.Game.Tests.Beatmaps.IO
                     var imported = await LoadOszIntoOsu(osu);
 
                     foreach (var b in imported.Beatmaps)
-                        b.OnlineBeatmapID = null;
+                        b.OnlineID = null;
 
                     osu.Dependencies.Get<BeatmapManager>().Update(imported);
 
@@ -545,19 +581,19 @@ namespace osu.Game.Tests.Beatmaps.IO
 
                     var toImport = new BeatmapSetInfo
                     {
-                        OnlineBeatmapSetID = 1,
+                        OnlineID = 1,
                         Metadata = metadata,
                         Beatmaps = new List<BeatmapInfo>
                         {
                             new BeatmapInfo
                             {
-                                OnlineBeatmapID = 2,
+                                OnlineID = 2,
                                 Metadata = metadata,
                                 BaseDifficulty = difficulty
                             },
                             new BeatmapInfo
                             {
-                                OnlineBeatmapID = 2,
+                                OnlineID = 2,
                                 Metadata = metadata,
                                 Status = BeatmapSetOnlineStatus.Loved,
                                 BaseDifficulty = difficulty
@@ -570,8 +606,8 @@ namespace osu.Game.Tests.Beatmaps.IO
                     var imported = await manager.Import(toImport);
 
                     Assert.NotNull(imported);
-                    Assert.AreEqual(null, imported.Value.Beatmaps[0].OnlineBeatmapID);
-                    Assert.AreEqual(null, imported.Value.Beatmaps[1].OnlineBeatmapID);
+                    Assert.AreEqual(null, imported.Value.Beatmaps[0].OnlineID);
+                    Assert.AreEqual(null, imported.Value.Beatmaps[1].OnlineID);
                 }
                 finally
                 {
@@ -790,12 +826,12 @@ namespace osu.Game.Tests.Beatmaps.IO
                     // Update via the beatmap, not the beatmap info, to ensure correct linking
                     BeatmapSetInfo setToUpdate = manager.GetAllUsableBeatmapSets()[0];
                     Beatmap beatmapToUpdate = (Beatmap)manager.GetWorkingBeatmap(setToUpdate.Beatmaps.First(b => b.RulesetID == 0)).Beatmap;
-                    beatmapToUpdate.BeatmapInfo.Version = "updated";
+                    beatmapToUpdate.BeatmapInfo.DifficultyName = "updated";
 
                     manager.Update(setToUpdate);
 
                     BeatmapInfo updatedInfo = manager.QueryBeatmap(b => b.ID == beatmapToUpdate.BeatmapInfo.ID);
-                    Assert.That(updatedInfo.Version, Is.EqualTo("updated"));
+                    Assert.That(updatedInfo.DifficultyName, Is.EqualTo("updated"));
                 }
                 finally
                 {
@@ -863,7 +899,7 @@ namespace osu.Game.Tests.Beatmaps.IO
 
                     var beatmap = working.Beatmap;
 
-                    beatmap.BeatmapInfo.Version = "difficulty";
+                    beatmap.BeatmapInfo.DifficultyName = "difficulty";
                     beatmap.BeatmapInfo.Metadata = new BeatmapMetadata
                     {
                         Artist = "Artist/With\\Slashes",
@@ -1020,13 +1056,13 @@ namespace osu.Game.Tests.Beatmaps.IO
         {
             IEnumerable<BeatmapSetInfo> resultSets = null;
             var store = osu.Dependencies.Get<BeatmapManager>();
-            waitForOrAssert(() => (resultSets = store.QueryBeatmapSets(s => s.OnlineBeatmapSetID == 241526)).Any(),
+            waitForOrAssert(() => (resultSets = store.QueryBeatmapSets(s => s.OnlineID == 241526)).Any(),
                 @"BeatmapSet did not import to the database in allocated time.", timeout);
 
             // ensure we were stored to beatmap database backing...
             Assert.IsTrue(resultSets.Count() == 1, $@"Incorrect result count found ({resultSets.Count()} but should be 1).");
-            IEnumerable<BeatmapInfo> queryBeatmaps() => store.QueryBeatmaps(s => s.BeatmapSet.OnlineBeatmapSetID == 241526 && s.BaseDifficultyID > 0);
-            IEnumerable<BeatmapSetInfo> queryBeatmapSets() => store.QueryBeatmapSets(s => s.OnlineBeatmapSetID == 241526);
+            IEnumerable<BeatmapInfo> queryBeatmaps() => store.QueryBeatmaps(s => s.BeatmapSet.OnlineID == 241526 && s.BaseDifficultyID > 0);
+            IEnumerable<BeatmapSetInfo> queryBeatmapSets() => store.QueryBeatmapSets(s => s.OnlineID == 241526);
 
             // if we don't re-check here, the set will be inserted but the beatmaps won't be present yet.
             waitForOrAssert(() => queryBeatmaps().Count() == 12,
@@ -1042,7 +1078,7 @@ namespace osu.Game.Tests.Beatmaps.IO
 
             var set = queryBeatmapSets().First();
             foreach (BeatmapInfo b in set.Beatmaps)
-                Assert.IsTrue(set.Beatmaps.Any(c => c.OnlineBeatmapID == b.OnlineBeatmapID));
+                Assert.IsTrue(set.Beatmaps.Any(c => c.OnlineID == b.OnlineID));
             Assert.IsTrue(set.Beatmaps.Count > 0);
             var beatmap = store.GetWorkingBeatmap(set.Beatmaps.First(b => b.RulesetID == 0))?.Beatmap;
             Assert.IsTrue(beatmap?.HitObjects.Any() == true);

osu.Game.Tests/Beatmaps/IO/OszArchiveReaderTest.cs

@@ -56,7 +56,7 @@ namespace osu.Game.Tests.Beatmaps.IO
 
                 var meta = beatmap.Metadata;
 
-                Assert.AreEqual(241526, beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID);
+                Assert.AreEqual(241526, beatmap.BeatmapInfo.BeatmapSet.OnlineID);
                 Assert.AreEqual("Soleily", meta.Artist);
                 Assert.AreEqual("Soleily", meta.ArtistUnicode);
                 Assert.AreEqual("03. Renatus - Soleily 192kbps.mp3", meta.AudioFile);

osu.Game.Tests/Beatmaps/ToStringFormattingTest.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Tests.Beatmaps
                     Title = "title",
                     Author = new APIUser { Username = "creator" }
                 },
-                Version = "difficulty"
+                DifficultyName = "difficulty"
             };
 
             Assert.That(beatmap.ToString(), Is.EqualTo("artist - title (creator) [difficulty]"));

osu.Game.Tests/Database/BeatmapImporterTests.cs

@@ -16,6 +16,7 @@ using osu.Game.Beatmaps;
 using osu.Game.Database;
 using osu.Game.IO.Archives;
 using osu.Game.Models;
+using osu.Game.Overlays.Notifications;
 using osu.Game.Stores;
 using osu.Game.Tests.Resources;
 using Realms;
@@ -367,6 +368,34 @@ namespace osu.Game.Tests.Database
             });
         }
 
+        [Test]
+        public void TestModelCreationFailureDoesntReturn()
+        {
+            RunTestWithRealmAsync(async (realmFactory, storage) =>
+            {
+                using var importer = new BeatmapImporter(realmFactory, storage);
+                using var store = new RealmRulesetStore(realmFactory, storage);
+
+                var progressNotification = new ImportProgressNotification();
+
+                var zipStream = new MemoryStream();
+
+                using (var zip = ZipArchive.Create())
+                    zip.SaveTo(zipStream, new ZipWriterOptions(CompressionType.Deflate));
+
+                var imported = await importer.Import(
+                    progressNotification,
+                    new ImportTask(zipStream, string.Empty)
+                );
+
+                checkBeatmapSetCount(realmFactory.Context, 0);
+                checkBeatmapCount(realmFactory.Context, 0);
+
+                Assert.IsEmpty(imported);
+                Assert.AreEqual(ProgressNotificationState.Cancelled, progressNotification.State);
+            });
+        }
+
         [Test]
         public void TestRollbackOnFailure()
         {

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

@@ -54,7 +54,7 @@ namespace osu.Game.Tests.Editing.Checks
         {
             // While this is a problem, it is out of scope for this check and is caught by a different one.
             beatmap.Metadata.BackgroundFile = string.Empty;
-            var context = getContext(null, System.Array.Empty<byte>());
+            var context = getContext(null, new MemoryStream(System.Array.Empty<byte>()));
 
             Assert.That(check.Run(context), Is.Empty);
         }
@@ -103,7 +103,7 @@ namespace osu.Game.Tests.Editing.Checks
         [Test]
         public void TestTooUncompressed()
         {
-            var context = getContext(new Texture(1920, 1080), new byte[1024 * 1024 * 3]);
+            var context = getContext(new Texture(1920, 1080), new MemoryStream(new byte[1024 * 1024 * 3]));
 
             var issues = check.Run(context).ToList();
 
@@ -111,19 +111,32 @@ namespace osu.Game.Tests.Editing.Checks
             Assert.That(issues.Single().Template is CheckBackgroundQuality.IssueTemplateTooUncompressed);
         }
 
-        private BeatmapVerifierContext getContext(Texture background, [CanBeNull] byte[] fileBytes = null)
+        [Test]
+        public void TestStreamClosed()
         {
-            return new BeatmapVerifierContext(beatmap, getMockWorkingBeatmap(background, fileBytes).Object);
+            var background = new Texture(1920, 1080);
+            var stream = new Mock<MemoryStream>(new byte[1024 * 1024]);
+
+            var context = getContext(background, stream.Object);
+
+            Assert.That(check.Run(context), Is.Empty);
+
+            stream.Verify(x => x.Close(), Times.Once());
+        }
+
+        private BeatmapVerifierContext getContext(Texture background, [CanBeNull] Stream stream = null)
+        {
+            return new BeatmapVerifierContext(beatmap, getMockWorkingBeatmap(background, stream).Object);
         }
 
         /// <summary>
-        /// Returns the mock of the working beatmap with the given background and filesize.
+        /// Returns the mock of the working beatmap with the given background and its file stream.
         /// </summary>
         /// <param name="background">The texture of the background.</param>
-        /// <param name="fileBytes">The bytes that represent the background file.</param>
-        private Mock<IWorkingBeatmap> getMockWorkingBeatmap(Texture background, [CanBeNull] byte[] fileBytes = null)
+        /// <param name="stream">The stream representing the background file.</param>
+        private Mock<IWorkingBeatmap> getMockWorkingBeatmap(Texture background, [CanBeNull] Stream stream = null)
         {
-            var stream = new MemoryStream(fileBytes ?? new byte[1024 * 1024]);
+            stream ??= new MemoryStream(new byte[1024 * 1024]);
 
             var mock = new Mock<IWorkingBeatmap>();
             mock.SetupGet(w => w.Beatmap).Returns(beatmap);

osu.Game.Tests/Models/DisplayStringTest.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 Moq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Extensions;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Rulesets;
+using osu.Game.Scoring;
+using osu.Game.Users;
+
+#nullable enable
+
+namespace osu.Game.Tests.Models
+{
+    [TestFixture]
+    public class DisplayStringTest
+    {
+        [Test]
+        public void TestNull()
+        {
+            IBeatmapSetInfo? beatmap = null;
+            Assert.That(beatmap.GetDisplayString(), Is.EqualTo("null"));
+        }
+
+        [Test]
+        public void TestBeatmapSet()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata!.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata!.Title).Returns("title");
+            mock.Setup(m => m.Metadata!.Author.Username).Returns("author");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author)"));
+        }
+
+        [Test]
+        public void TestBeatmapSetWithNoAuthor()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata!.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata!.Title).Returns("title");
+            mock.Setup(m => m.Metadata!.Author.Username).Returns(string.Empty);
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title"));
+        }
+
+        [Test]
+        public void TestBeatmapSetWithNoMetadata()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata).Returns(new BeatmapMetadata());
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("unknown artist - unknown title"));
+        }
+
+        [Test]
+        public void TestBeatmap()
+        {
+            var mock = new Mock<IBeatmapInfo>();
+
+            mock.Setup(m => m.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Metadata.Author.Username).Returns("author");
+            mock.Setup(m => m.DifficultyName).Returns("difficulty");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author) [difficulty]"));
+        }
+
+        [Test]
+        public void TestMetadata()
+        {
+            var mock = new Mock<IBeatmapMetadataInfo>();
+
+            mock.Setup(m => m.Artist).Returns("artist");
+            mock.Setup(m => m.Title).Returns("title");
+            mock.Setup(m => m.Author.Username).Returns("author");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author)"));
+        }
+
+        [Test]
+        public void TestScore()
+        {
+            var mock = new Mock<IScoreInfo>();
+
+            mock.Setup(m => m.User).Returns(new APIUser { Username = "user" }); // TODO: temporary.
+            mock.Setup(m => m.Beatmap.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Beatmap.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Beatmap.Metadata.Author.Username).Returns("author");
+            mock.Setup(m => m.Beatmap.DifficultyName).Returns("difficulty");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("user playing artist - title (author) [difficulty]"));
+        }
+
+        [Test]
+        public void TestRuleset()
+        {
+            var mock = new Mock<IRulesetInfo>();
+
+            mock.Setup(m => m.Name).Returns("ruleset");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("ruleset"));
+        }
+
+        [Test]
+        public void TestUser()
+        {
+            var mock = new Mock<IUser>();
+
+            mock.Setup(m => m.Username).Returns("user");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("user"));
+        }
+
+        [Test]
+        public void TestFallback()
+        {
+            var fallback = new Fallback();
+
+            Assert.That(fallback.GetDisplayString(), Is.EqualTo("fallback"));
+        }
+
+        private class Fallback
+        {
+            public override string ToString() => "fallback";
+        }
+    }
+}

osu.Game.Tests/NonVisual/BeatmapSetInfoEqualityTest.cs

@@ -12,8 +12,8 @@ namespace osu.Game.Tests.NonVisual
         [Test]
         public void TestOnlineWithOnline()
         {
-            var ourInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 123 };
-            var otherInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 123 };
+            var ourInfo = new BeatmapSetInfo { OnlineID = 123 };
+            var otherInfo = new BeatmapSetInfo { OnlineID = 123 };
 
             Assert.AreEqual(ourInfo, otherInfo);
         }
@@ -30,8 +30,8 @@ namespace osu.Game.Tests.NonVisual
         [Test]
         public void TestDatabasedWithOnline()
         {
-            var ourInfo = new BeatmapSetInfo { ID = 123, OnlineBeatmapSetID = 12 };
-            var otherInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 12 };
+            var ourInfo = new BeatmapSetInfo { ID = 123, OnlineID = 12 };
+            var otherInfo = new BeatmapSetInfo { OnlineID = 12 };
 
             Assert.AreEqual(ourInfo, otherInfo);
         }

osu.Game.Tests/NonVisual/Filtering/FilterMatchingTest.cs

@@ -17,7 +17,7 @@ namespace osu.Game.Tests.NonVisual.Filtering
         private BeatmapInfo getExampleBeatmap() => new BeatmapInfo
         {
             Ruleset = new RulesetInfo { ID = 5 },
-            StarDifficulty = 4.0d,
+            StarRating = 4.0d,
             BaseDifficulty = new BeatmapDifficulty
             {
                 ApproachRate = 5.0f,
@@ -34,7 +34,7 @@ namespace osu.Game.Tests.NonVisual.Filtering
                 Source = "unit tests",
                 Tags = "look for tags too",
             },
-            Version = "version as well",
+            DifficultyName = "version as well",
             Length = 2500,
             BPM = 160,
             BeatDivisor = 12,
@@ -207,8 +207,8 @@ namespace osu.Game.Tests.NonVisual.Filtering
         public void TestCriteriaMatchingBeatmapIDs(string query, bool filtered)
         {
             var beatmap = getExampleBeatmap();
-            beatmap.OnlineBeatmapID = 20201010;
-            beatmap.BeatmapSet = new BeatmapSetInfo { OnlineBeatmapSetID = 1535 };
+            beatmap.OnlineID = 20201010;
+            beatmap.BeatmapSet = new BeatmapSetInfo { OnlineID = 1535 };
 
             var criteria = new FilterCriteria { SearchText = query };
             var carouselItem = new CarouselBeatmap(beatmap);

osu.Game.Tests/NonVisual/Ranking/UnstableRateTest.cs

@@ -22,7 +22,8 @@ namespace osu.Game.Tests.NonVisual.Ranking
 
             var unstableRate = new UnstableRate(events);
 
-            Assert.IsTrue(Precision.AlmostEquals(unstableRate.Value, 10 * Math.Sqrt(10)));
+            Assert.IsNotNull(unstableRate.Value);
+            Assert.IsTrue(Precision.AlmostEquals(unstableRate.Value.Value, 10 * Math.Sqrt(10)));
         }
 
         [Test]

osu.Game.Tests/Online/TestSceneBeatmapManager.cs

@@ -5,6 +5,7 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays.Notifications;
 using osu.Game.Tests.Visual;
 
@@ -16,7 +17,30 @@ namespace osu.Game.Tests.Online
         private BeatmapManager beatmaps;
         private ProgressNotification recentNotification;
 
-        private static readonly BeatmapSetInfo test_model = new BeatmapSetInfo { OnlineBeatmapSetID = 1 };
+        private static readonly BeatmapSetInfo test_db_model = new BeatmapSetInfo
+        {
+            OnlineID = 1,
+            Metadata = new BeatmapMetadata
+            {
+                Artist = "test author",
+                Title = "test title",
+                Author = new APIUser
+                {
+                    Username = "mapper"
+                }
+            }
+        };
+
+        private static readonly APIBeatmapSet test_online_model = new APIBeatmapSet
+        {
+            OnlineID = 2,
+            Artist = "test author",
+            Title = "test title",
+            Author = new APIUser
+            {
+                Username = "mapper"
+            }
+        };
 
         [BackgroundDependencyLoader]
         private void load(BeatmapManager beatmaps)
@@ -26,25 +50,41 @@ namespace osu.Game.Tests.Online
             beatmaps.PostNotification = n => recentNotification = n as ProgressNotification;
         }
 
+        private static readonly object[][] notification_test_cases =
+        {
+            new object[] { test_db_model },
+            new object[] { test_online_model }
+        };
+
+        [TestCaseSource(nameof(notification_test_cases))]
+        public void TestNotificationMessage(IBeatmapSetInfo model)
+        {
+            AddStep("clear recent notification", () => recentNotification = null);
+            AddStep("download beatmap", () => beatmaps.Download(model));
+
+            AddUntilStep("wait for notification", () => recentNotification != null);
+            AddUntilStep("notification text correct", () => recentNotification.Text.ToString() == "Downloading test author - test title (mapper)");
+        }
+
         [Test]
         public void TestCancelDownloadFromRequest()
         {
-            AddStep("download beatmap", () => beatmaps.Download(test_model));
+            AddStep("download beatmap", () => beatmaps.Download(test_db_model));
 
-            AddStep("cancel download from request", () => beatmaps.GetExistingDownload(test_model).Cancel());
+            AddStep("cancel download from request", () => beatmaps.GetExistingDownload(test_db_model).Cancel());
 
-            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_model) == null);
+            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_db_model) == null);
             AddAssert("is notification cancelled", () => recentNotification.State == ProgressNotificationState.Cancelled);
         }
 
         [Test]
         public void TestCancelDownloadFromNotification()
         {
-            AddStep("download beatmap", () => beatmaps.Download(test_model));
+            AddStep("download beatmap", () => beatmaps.Download(test_db_model));
 
             AddStep("cancel download from notification", () => recentNotification.Close());
 
-            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_model) == null);
+            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_db_model) == null);
             AddAssert("is notification cancelled", () => recentNotification.State == ProgressNotificationState.Cancelled);
         }
     }

osu.Game.Tests/Online/TestSceneOnlinePlayBeatmapAvailabilityTracker.cs

@@ -58,7 +58,7 @@ namespace osu.Game.Tests.Online
             testBeatmapInfo = getTestBeatmapInfo(testBeatmapFile);
             testBeatmapSet = testBeatmapInfo.BeatmapSet;
 
-            var existing = beatmaps.QueryBeatmapSet(s => s.OnlineBeatmapSetID == testBeatmapSet.OnlineBeatmapSetID);
+            var existing = beatmaps.QueryBeatmapSet(s => s.OnlineID == testBeatmapSet.OnlineID);
             if (existing != null)
                 beatmaps.Delete(existing);
 
@@ -101,10 +101,10 @@ namespace osu.Game.Tests.Online
             AddStep("import beatmap", () => beatmaps.Import(testBeatmapFile).Wait());
             addAvailabilityCheckStep("state locally available", BeatmapAvailability.LocallyAvailable);
 
-            AddStep("delete beatmap", () => beatmaps.Delete(beatmaps.QueryBeatmapSet(b => b.OnlineBeatmapSetID == testBeatmapSet.OnlineBeatmapSetID)));
+            AddStep("delete beatmap", () => beatmaps.Delete(beatmaps.QueryBeatmapSet(b => b.OnlineID == testBeatmapSet.OnlineID)));
             addAvailabilityCheckStep("state not downloaded", BeatmapAvailability.NotDownloaded);
 
-            AddStep("undelete beatmap", () => beatmaps.Undelete(beatmaps.QueryBeatmapSet(b => b.OnlineBeatmapSetID == testBeatmapSet.OnlineBeatmapSetID)));
+            AddStep("undelete beatmap", () => beatmaps.Undelete(beatmaps.QueryBeatmapSet(b => b.OnlineID == testBeatmapSet.OnlineID)));
             addAvailabilityCheckStep("state locally available", BeatmapAvailability.LocallyAvailable);
         }
 

osu.Game.Tests/Visual/Components/TestScenePreviewTrackManager.cs

@@ -13,10 +13,17 @@ namespace osu.Game.Tests.Visual.Components
 {
     public class TestScenePreviewTrackManager : OsuTestScene, IPreviewTrackOwner
     {
-        private readonly TestPreviewTrackManager trackManager = new TestPreviewTrackManager();
+        private readonly IAdjustableAudioComponent gameTrackAudio = new AudioAdjustments();
+
+        private readonly TestPreviewTrackManager trackManager;
 
         private AudioManager audio;
 
+        public TestScenePreviewTrackManager()
+        {
+            trackManager = new TestPreviewTrackManager(gameTrackAudio);
+        }
+
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)
         {
             var dependencies = new DependencyContainer(base.CreateChildDependencies(parent));
@@ -151,19 +158,19 @@ namespace osu.Game.Tests.Visual.Components
                     audio.VolumeTrack.Value = 1;
             });
 
-            AddAssert("game not muted", () => audio.Tracks.AggregateVolume.Value != 0);
+            AddAssert("game not muted", () => gameTrackAudio.AggregateVolume.Value != 0);
 
             AddStep("get track", () => Add(owner = new TestTrackOwner(track = getTrack())));
             AddUntilStep("wait loaded", () => track.IsLoaded);
             AddStep("start track", () => track.Start());
-            AddAssert("game is muted", () => audio.Tracks.AggregateVolume.Value == 0);
+            AddAssert("game is muted", () => gameTrackAudio.AggregateVolume.Value == 0);
 
             if (stopAnyPlaying)
                 AddStep("stop any playing", () => trackManager.StopAnyPlaying(owner));
             else
                 AddStep("stop track", () => track.Stop());
 
-            AddAssert("game not muted", () => audio.Tracks.AggregateVolume.Value != 0);
+            AddAssert("game not muted", () => gameTrackAudio.AggregateVolume.Value != 0);
         }
 
         [Test]
@@ -224,6 +231,11 @@ namespace osu.Game.Tests.Visual.Components
 
             public new PreviewTrack CurrentTrack => base.CurrentTrack;
 
+            public TestPreviewTrackManager(IAdjustableAudioComponent mainTrackAdjustments)
+                : base(mainTrackAdjustments)
+            {
+            }
+
             protected override TrackManagerPreviewTrack CreatePreviewTrack(IBeatmapSetInfo beatmapSetInfo, ITrackStore trackStore) => new TestPreviewTrack(beatmapSetInfo, trackStore);
 
             public override bool UpdateSubTree()

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

@@ -26,6 +26,9 @@ namespace osu.Game.Tests.Visual.Editing
                 }
             });
 
+        [Cached]
+        private EditorClipboard clipboard = new EditorClipboard();
+
         [BackgroundDependencyLoader]
         private void load()
         {

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

@@ -46,7 +46,7 @@ namespace osu.Game.Tests.Visual.Editing
                 editorBeatmap.BeatmapInfo.Metadata.Artist = "artist";
                 editorBeatmap.BeatmapInfo.Metadata.Title = "title";
             });
-            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.Version = "difficulty");
+            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName = "difficulty");
 
             AddStep("Add timing point", () => editorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint()));
 
@@ -85,7 +85,7 @@ namespace osu.Game.Tests.Visual.Editing
             AddAssert("Beatmap contains single hitcircle", () => editorBeatmap.HitObjects.Count == 1);
             AddAssert("Beatmap has correct overall difficulty", () => editorBeatmap.Difficulty.OverallDifficulty == 7);
             AddAssert("Beatmap has correct metadata", () => editorBeatmap.BeatmapInfo.Metadata.Artist == "artist" && editorBeatmap.BeatmapInfo.Metadata.Title == "title");
-            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.Version == "difficulty");
+            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName == "difficulty");
         }
     }
 }

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

@@ -0,0 +1,123 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Screens;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Screens.Edit;
+using osu.Game.Screens.Edit.Components.Timelines.Summary;
+using osu.Game.Tests.Beatmaps.IO;
+using osuTK.Input;
+
+namespace osu.Game.Tests.Visual.Editing
+{
+    public class TestSceneEditorTestGameplay : EditorTestScene
+    {
+        protected override bool IsolateSavingFromDatabase => false;
+
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        [Resolved]
+        private OsuGameBase game { get; set; }
+
+        [Resolved]
+        private BeatmapManager beatmaps { get; set; }
+
+        private BeatmapSetInfo importedBeatmapSet;
+
+        public override void SetUpSteps()
+        {
+            AddStep("import test beatmap", () => importedBeatmapSet = ImportBeatmapTest.LoadOszIntoOsu(game).Result);
+            base.SetUpSteps();
+        }
+
+        protected override void LoadEditor()
+        {
+            Beatmap.Value = beatmaps.GetWorkingBeatmap(importedBeatmapSet.Beatmaps.First(b => b.RulesetID == 0));
+            base.LoadEditor();
+        }
+
+        [Test]
+        public void TestBasicGameplayTest()
+        {
+            AddStep("click test gameplay button", () =>
+            {
+                var button = Editor.ChildrenOfType<TestGameplayButton>().Single();
+
+                InputManager.MoveMouseTo(button);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            EditorPlayer editorPlayer = null;
+            AddUntilStep("player pushed", () => (editorPlayer = Stack.CurrentScreen as EditorPlayer) != null);
+            AddStep("exit player", () => editorPlayer.Exit());
+            AddUntilStep("current screen is editor", () => Stack.CurrentScreen is Editor);
+        }
+
+        [Test]
+        public void TestCancelGameplayTestWithUnsavedChanges()
+        {
+            AddStep("delete all but first object", () => EditorBeatmap.RemoveRange(EditorBeatmap.HitObjects.Skip(1).ToList()));
+
+            AddStep("click test gameplay button", () =>
+            {
+                var button = Editor.ChildrenOfType<TestGameplayButton>().Single();
+
+                InputManager.MoveMouseTo(button);
+                InputManager.Click(MouseButton.Left);
+            });
+            AddUntilStep("save prompt shown", () => DialogOverlay.CurrentDialog is SaveBeforeGameplayTestDialog);
+
+            AddStep("dismiss prompt", () =>
+            {
+                var button = DialogOverlay.CurrentDialog.Buttons.Last();
+                InputManager.MoveMouseTo(button);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddWaitStep("wait some", 3);
+            AddAssert("stayed in editor", () => Stack.CurrentScreen is Editor);
+        }
+
+        [Test]
+        public void TestSaveChangesBeforeGameplayTest()
+        {
+            AddStep("delete all but first object", () => EditorBeatmap.RemoveRange(EditorBeatmap.HitObjects.Skip(1).ToList()));
+            // bit of a hack to ensure this test can be ran multiple times without running into UNIQUE constraint failures
+            AddStep("set unique difficulty name", () => EditorBeatmap.BeatmapInfo.DifficultyName = Guid.NewGuid().ToString());
+
+            AddStep("click test gameplay button", () =>
+            {
+                var button = Editor.ChildrenOfType<TestGameplayButton>().Single();
+
+                InputManager.MoveMouseTo(button);
+                InputManager.Click(MouseButton.Left);
+            });
+            AddUntilStep("save prompt shown", () => DialogOverlay.CurrentDialog is SaveBeforeGameplayTestDialog);
+
+            AddStep("save changes", () => DialogOverlay.CurrentDialog.PerformOkAction());
+
+            EditorPlayer editorPlayer = null;
+            AddUntilStep("player pushed", () => (editorPlayer = Stack.CurrentScreen as EditorPlayer) != null);
+            AddAssert("beatmap has 1 object", () => editorPlayer.Beatmap.Value.Beatmap.HitObjects.Count == 1);
+
+            AddUntilStep("wait for return to editor", () => Stack.CurrentScreen is Editor);
+            AddAssert("track stopped", () => !Beatmap.Value.Track.IsRunning);
+        }
+
+        public override void TearDownSteps()
+        {
+            base.TearDownSteps();
+            AddStep("delete imported", () =>
+            {
+                beatmaps.Delete(importedBeatmapSet);
+            });
+        }
+    }
+}

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

@@ -4,6 +4,7 @@
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Catch;
 using osu.Game.Rulesets.Edit;
@@ -23,6 +24,9 @@ namespace osu.Game.Tests.Visual.Editing
         [Cached(typeof(IBeatSnapProvider))]
         private readonly EditorBeatmap editorBeatmap;
 
+        [Cached]
+        private readonly OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Blue);
+
         public TestSceneSetupScreen()
         {
             editorBeatmap = new EditorBeatmap(new OsuBeatmap());

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

@@ -4,6 +4,7 @@
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Screens.Edit;
@@ -18,6 +19,9 @@ namespace osu.Game.Tests.Visual.Editing
         [Cached(typeof(IBeatSnapProvider))]
         private readonly EditorBeatmap editorBeatmap;
 
+        [Cached]
+        private readonly OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Blue);
+
         protected override bool ScrollUsingMouseWheel => false;
 
         public TestSceneTimingScreen()

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

@@ -1,9 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Diagnostics;
 using NUnit.Framework;
-using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Testing;
 using osu.Game.Rulesets;
@@ -20,16 +21,17 @@ namespace osu.Game.Tests.Visual.Gameplay
 {
     public class TestScenePerformancePointsCounter : OsuTestScene
     {
-        [Cached]
-        private GameplayState gameplayState;
+        private DependencyProvidingContainer dependencyContainer;
 
-        [Cached]
+        private GameplayState gameplayState;
         private ScoreProcessor scoreProcessor;
 
         private int iteration;
+        private Bindable<JudgementResult> lastJudgementResult = new Bindable<JudgementResult>();
         private PerformancePointsCounter counter;
 
-        public TestScenePerformancePointsCounter()
+        [SetUpSteps]
+        public void SetUpSteps() => AddStep("create components", () =>
         {
             var ruleset = CreateRuleset();
 
@@ -38,32 +40,43 @@ namespace osu.Game.Tests.Visual.Gameplay
             var beatmap = CreateWorkingBeatmap(ruleset.RulesetInfo)
                 .GetPlayableBeatmap(ruleset.RulesetInfo);
 
+            lastJudgementResult = new Bindable<JudgementResult>();
+
             gameplayState = new GameplayState(beatmap, ruleset);
+            gameplayState.LastJudgementResult.BindTo(lastJudgementResult);
+
             scoreProcessor = new ScoreProcessor();
-        }
+
+            Child = dependencyContainer = new DependencyProvidingContainer
+            {
+                RelativeSizeAxes = Axes.Both,
+                CachedDependencies = new (Type, object)[]
+                {
+                    (typeof(GameplayState), gameplayState),
+                    (typeof(ScoreProcessor), scoreProcessor)
+                }
+            };
+
+            iteration = 0;
+        });
 
         protected override Ruleset CreateRuleset() => new OsuRuleset();
 
-        [SetUpSteps]
-        public void SetUpSteps()
+        private void createCounter() => AddStep("Create counter", () =>
         {
-            AddStep("Create counter", () =>
+            dependencyContainer.Child = counter = new PerformancePointsCounter
             {
-                iteration = 0;
-
-                Child = counter = new PerformancePointsCounter
-                {
-                    Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
-                    Scale = new Vector2(5),
-                };
-            });
-        }
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Scale = new Vector2(5),
+            };
+        });
 
         [Test]
         public void TestBasicCounting()
         {
             int previousValue = 0;
+            createCounter();
 
             AddAssert("counter displaying zero", () => counter.Current.Value == 0);
 
@@ -86,6 +99,17 @@ namespace osu.Game.Tests.Visual.Gameplay
             AddUntilStep("counter non-zero", () => counter.Current.Value > 0);
         }
 
+        [Test]
+        public void TestCounterUpdatesWithJudgementsBeforeCreation()
+        {
+            AddRepeatStep("Add judgement", applyOneJudgement, 10);
+
+            createCounter();
+
+            AddUntilStep("counter non-zero", () => counter.Current.Value > 0);
+            AddUntilStep("counter opaque", () => counter.Child.Alpha == 1);
+        }
+
         private void applyOneJudgement()
         {
             var scoreInfo = gameplayState.Score.ScoreInfo;
@@ -94,13 +118,14 @@ namespace osu.Game.Tests.Visual.Gameplay
             scoreInfo.Accuracy = 1;
             scoreInfo.Statistics[HitResult.Great] = iteration * 1000;
 
-            scoreProcessor.ApplyResult(new OsuJudgementResult(new HitObject
+            lastJudgementResult.Value = new OsuJudgementResult(new HitObject
             {
                 StartTime = iteration * 10000,
             }, new OsuJudgement())
             {
                 Type = HitResult.Perfect,
-            });
+            };
+            scoreProcessor.ApplyResult(lastJudgementResult.Value);
 
             iteration++;
         }

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

@@ -215,7 +215,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             createPlayerTest(false, r =>
             {
                 var beatmap = createTestBeatmap(r);
-                beatmap.BeatmapInfo.OnlineBeatmapID = null;
+                beatmap.BeatmapInfo.OnlineID = null;
                 return beatmap;
             });
 

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

@@ -175,7 +175,7 @@ namespace osu.Game.Tests.Visual.Gameplay
                     Id = 39828,
                     Username = @"WubWoofWolf",
                 }
-            }.CreateScoreInfo(rulesets);
+            }.CreateScoreInfo(rulesets, CreateBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo);
         }
 
         private class TestReplayDownloadButton : ReplayDownloadButton

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

@@ -61,7 +61,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             AddStep("import beatmap", () =>
             {
                 importedBeatmap = ImportBeatmapTest.LoadOszIntoOsu(game, virtualTrack: true).Result;
-                importedBeatmapId = importedBeatmap.Beatmaps.First(b => b.RulesetID == 0).OnlineBeatmapID ?? -1;
+                importedBeatmapId = importedBeatmap.Beatmaps.First(b => b.RulesetID == 0).OnlineID ?? -1;
             });
         }
 

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

@@ -0,0 +1,108 @@
+// 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.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Testing;
+using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Scoring;
+using osu.Game.Rulesets.Scoring;
+using osu.Game.Screens.Play.HUD;
+using osuTK;
+
+namespace osu.Game.Tests.Visual.Gameplay
+{
+    public class TestSceneUnstableRateCounter : OsuTestScene
+    {
+        [Cached(typeof(ScoreProcessor))]
+        private TestScoreProcessor scoreProcessor = new TestScoreProcessor();
+
+        private readonly OsuHitWindows hitWindows = new OsuHitWindows();
+
+        private UnstableRateCounter counter;
+
+        private double prev;
+
+        [SetUpSteps]
+        public void SetUp()
+        {
+            AddStep("Reset Score Processor", () => scoreProcessor.Reset());
+        }
+
+        [Test]
+        public void TestBasic()
+        {
+            AddStep("Create Display", recreateDisplay);
+
+            // Needs multiples 2 by the nature of UR, and went for 4 to be safe.
+            // Creates a 250 UR by placing a +25ms then a -25ms judgement, which then results in a 250 UR
+            AddRepeatStep("Set UR to 250", () => applyJudgement(25, true), 4);
+
+            AddUntilStep("UR = 250", () => counter.Current.Value == 250.0);
+
+            AddRepeatStep("Revert UR", () =>
+            {
+                scoreProcessor.RevertResult(
+                    new JudgementResult(new HitCircle { HitWindows = hitWindows }, new Judgement())
+                    {
+                        TimeOffset = 25,
+                        Type = HitResult.Perfect,
+                    });
+            }, 4);
+
+            AddUntilStep("UR is 0", () => counter.Current.Value == 0.0);
+            AddUntilStep("Counter is invalid", () => counter.Child.Alpha == 0.3f);
+
+            //Sets a UR of 0 by creating 10 10ms offset judgements. Since average = offset, UR = 0
+            AddRepeatStep("Set UR to 0", () => applyJudgement(10, false), 10);
+            //Applies a UR of 100 by creating 10 -10ms offset judgements. At the 10th judgement, offset should be 100.
+            AddRepeatStep("Bring UR to 100", () => applyJudgement(-10, false), 10);
+        }
+
+        [Test]
+        public void TestCounterReceivesJudgementsBeforeCreation()
+        {
+            AddRepeatStep("Set UR to 250", () => applyJudgement(25, true), 4);
+
+            AddStep("Create Display", recreateDisplay);
+
+            AddUntilStep("UR = 250", () => counter.Current.Value == 250.0);
+        }
+
+        private void recreateDisplay()
+        {
+            Clear();
+
+            Add(counter = new UnstableRateCounter
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Scale = new Vector2(5),
+            });
+        }
+
+        private void applyJudgement(double offsetMs, bool alt)
+        {
+            double placement = offsetMs;
+
+            if (alt)
+            {
+                placement = prev > 0 ? -offsetMs : offsetMs;
+                prev = placement;
+            }
+
+            scoreProcessor.ApplyResult(new JudgementResult(new HitCircle { HitWindows = hitWindows }, new Judgement())
+            {
+                TimeOffset = placement,
+                Type = HitResult.Perfect,
+            });
+        }
+
+        private class TestScoreProcessor : ScoreProcessor
+        {
+            public void Reset() => base.Reset(false);
+        }
+    }
+}

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

@@ -59,7 +59,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5
+                                                StarRating = 2.5
                                             }
                                         }.BeatmapInfo,
                                     }
@@ -82,7 +82,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5,
+                                                StarRating = 2.5,
                                                 Metadata =
                                                 {
                                                     Artist = "very very very very very very very very very long artist",
@@ -111,7 +111,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5
+                                                StarRating = 2.5
                                             }
                                         }.BeatmapInfo,
                                     }
@@ -124,7 +124,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 4.5
+                                                StarRating = 4.5
                                             }
                                         }.BeatmapInfo,
                                     }

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

@@ -48,7 +48,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
         {
             importedSet = ImportBeatmapTest.LoadOszIntoOsu(game, virtualTrack: true).Result;
             importedBeatmap = importedSet.Beatmaps.First(b => b.RulesetID == 0);
-            importedBeatmapId = importedBeatmap.OnlineBeatmapID ?? -1;
+            importedBeatmapId = importedBeatmap.OnlineID ?? -1;
         }
 
         [SetUp]

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

@@ -57,7 +57,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
                 foreach (int user in users)
                 {
-                    SpectatorClient.StartPlay(user, Beatmap.Value.BeatmapInfo.OnlineBeatmapID ?? 0);
+                    SpectatorClient.StartPlay(user, Beatmap.Value.BeatmapInfo.OnlineID ?? 0);
                     multiplayerUsers.Add(OnlinePlayDependencies.Client.AddUser(new APIUser { Id = user }, true));
                 }
 

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

@@ -61,7 +61,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
                 foreach (int user in users)
                 {
-                    SpectatorClient.StartPlay(user, Beatmap.Value.BeatmapInfo.OnlineBeatmapID ?? 0);
+                    SpectatorClient.StartPlay(user, Beatmap.Value.BeatmapInfo.OnlineID ?? 0);
                     var roomUser = OnlinePlayDependencies.Client.AddUser(new APIUser { Id = user }, true);
 
                     roomUser.MatchState = new TeamVersusUserState

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

@@ -57,7 +57,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 beatmaps.Add(new BeatmapInfo
                 {
                     Ruleset = rulesets.GetRuleset(i % 4),
-                    OnlineBeatmapID = beatmapId,
+                    OnlineID = beatmapId,
                     Length = length,
                     BPM = bpm,
                     BaseDifficulty = new BeatmapDifficulty()
@@ -66,7 +66,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             manager.Import(new BeatmapSetInfo
             {
-                OnlineBeatmapSetID = 10,
+                OnlineID = 10,
                 Hash = Guid.NewGuid().ToString().ComputeMD5Hash(),
                 Metadata = new BeatmapMetadata
                 {

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

@@ -54,8 +54,8 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 beatmaps.Add(new BeatmapInfo
                 {
                     Ruleset = new OsuRuleset().RulesetInfo,
-                    OnlineBeatmapID = beatmapId,
-                    Version = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
+                    OnlineID = beatmapId,
+                    DifficultyName = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
                     Length = length,
                     BPM = bpm,
                     BaseDifficulty = new BeatmapDifficulty
@@ -67,7 +67,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             manager.Import(new BeatmapSetInfo
             {
-                OnlineBeatmapSetID = 10,
+                OnlineID = 10,
                 Hash = new MemoryStream(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString())).ComputeMD5Hash(),
                 Metadata = new BeatmapMetadata
                 {

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

@@ -31,8 +31,8 @@ namespace osu.Game.Tests.Visual.Multiplayer
             {
                 SelectedRoom.Value.Playlist.AddRange(new[]
                 {
-                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarDifficulty = min } } },
-                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarDifficulty = max } } },
+                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarRating = min } } },
+                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarRating = max } } },
                 });
             });
         }

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

@@ -10,6 +10,7 @@ using osu.Framework.Platform;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Database;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Online.Multiplayer.MatchTypes.TeamVersus;
 using osu.Game.Online.Rooms;
 using osu.Game.Rulesets;
@@ -97,16 +98,24 @@ namespace osu.Game.Tests.Visual.Multiplayer
             });
 
             AddAssert("user on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
+            AddStep("add another user", () => client.AddUser(new APIUser { Username = "otheruser", Id = 44 }));
 
-            AddStep("press button", () =>
+            AddStep("press own button", () =>
             {
                 InputManager.MoveMouseTo(multiplayerScreenStack.ChildrenOfType<TeamDisplay>().First());
                 InputManager.Click(MouseButton.Left);
             });
             AddAssert("user on team 1", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 1);
 
-            AddStep("press button", () => InputManager.Click(MouseButton.Left));
+            AddStep("press own button again", () => InputManager.Click(MouseButton.Left));
             AddAssert("user on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
+
+            AddStep("press other user's button", () =>
+            {
+                InputManager.MoveMouseTo(multiplayerScreenStack.ChildrenOfType<TeamDisplay>().ElementAt(1));
+                InputManager.Click(MouseButton.Left);
+            });
+            AddAssert("user still on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
         }
 
         [Test]
@@ -127,9 +136,13 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddAssert("room type is head to head", () => client.Room?.Settings.MatchType == MatchType.HeadToHead);
 
+            AddUntilStep("team displays are not displaying teams", () => multiplayerScreenStack.ChildrenOfType<TeamDisplay>().All(d => d.DisplayedTeam == null));
+
             AddStep("change to team vs", () => client.ChangeSettings(matchType: MatchType.TeamVersus));
 
             AddAssert("room type is team vs", () => client.Room?.Settings.MatchType == MatchType.TeamVersus);
+
+            AddUntilStep("team displays are displaying teams", () => multiplayerScreenStack.ChildrenOfType<TeamDisplay>().All(d => d.DisplayedTeam != null));
         }
 
         private void createRoom(Func<Room> room)

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

@@ -174,7 +174,7 @@ namespace osu.Game.Tests.Visual.Navigation
         {
             AddStep("import beatmap", () => ImportBeatmapTest.LoadQuickOszIntoOsu(Game).Wait());
             PushAndConfirm(() => new TestPlaySongSelect());
-            AddUntilStep("beatmap updated", () => Game.Beatmap.Value.BeatmapSetInfo.OnlineBeatmapSetID == 241526);
+            AddUntilStep("beatmap updated", () => Game.Beatmap.Value.BeatmapSetInfo.OnlineID == 241526);
         }
 
         public class DialogBlockingScreen : OsuScreen

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

@@ -107,20 +107,20 @@ namespace osu.Game.Tests.Visual.Navigation
                 imported = Game.BeatmapManager.Import(new BeatmapSetInfo
                 {
                     Hash = Guid.NewGuid().ToString(),
-                    OnlineBeatmapSetID = i,
+                    OnlineID = i,
                     Metadata = metadata,
                     Beatmaps = new List<BeatmapInfo>
                     {
                         new BeatmapInfo
                         {
-                            OnlineBeatmapID = i * 1024,
+                            OnlineID = i * 1024,
                             Metadata = metadata,
                             BaseDifficulty = difficulty,
                             Ruleset = ruleset ?? new OsuRuleset().RulesetInfo
                         },
                         new BeatmapInfo
                         {
-                            OnlineBeatmapID = i * 2048,
+                            OnlineID = i * 2048,
                             Metadata = metadata,
                             BaseDifficulty = difficulty,
                             Ruleset = ruleset ?? new OsuRuleset().RulesetInfo
@@ -145,11 +145,11 @@ namespace osu.Game.Tests.Visual.Navigation
 
         private void presentSecondDifficultyAndConfirm(Func<BeatmapSetInfo> getImport, int importedID)
         {
-            Predicate<BeatmapInfo> pred = b => b.OnlineBeatmapID == importedID * 2048;
+            Predicate<BeatmapInfo> pred = b => b.OnlineID == importedID * 2048;
             AddStep("present difficulty", () => Game.PresentBeatmap(getImport(), pred));
 
             AddUntilStep("wait for song select", () => Game.ScreenStack.CurrentScreen is Screens.Select.SongSelect);
-            AddUntilStep("correct beatmap displayed", () => Game.Beatmap.Value.BeatmapInfo.OnlineBeatmapID == importedID * 2048);
+            AddUntilStep("correct beatmap displayed", () => Game.Beatmap.Value.BeatmapInfo.OnlineID == importedID * 2048);
             AddAssert("correct ruleset selected", () => Game.Ruleset.Value.ID == getImport().Beatmaps.First().Ruleset.ID);
         }
     }

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

@@ -39,20 +39,20 @@ namespace osu.Game.Tests.Visual.Navigation
                 beatmap = Game.BeatmapManager.Import(new BeatmapSetInfo
                 {
                     Hash = Guid.NewGuid().ToString(),
-                    OnlineBeatmapSetID = 1,
+                    OnlineID = 1,
                     Metadata = metadata,
                     Beatmaps = new List<BeatmapInfo>
                     {
                         new BeatmapInfo
                         {
-                            OnlineBeatmapID = 1 * 1024,
+                            OnlineID = 1 * 1024,
                             Metadata = metadata,
                             BaseDifficulty = difficulty,
                             Ruleset = new OsuRuleset().RulesetInfo
                         },
                         new BeatmapInfo
                         {
-                            OnlineBeatmapID = 1 * 2048,
+                            OnlineID = 1 * 2048,
                             Metadata = metadata,
                             BaseDifficulty = difficulty,
                             Ruleset = new OsuRuleset().RulesetInfo

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

@@ -44,7 +44,7 @@ namespace osu.Game.Tests.Visual.Online
             AddAssert("button state not downloaded", () => downloadButton.DownloadState == DownloadState.NotDownloaded);
             AddStep("import soleily", () => beatmaps.Import(TestResources.GetQuickTestBeatmapForImport()));
 
-            AddUntilStep("wait for beatmap import", () => beatmaps.GetAllUsableBeatmapSets().Any(b => b.OnlineBeatmapSetID == 241526));
+            AddUntilStep("wait for beatmap import", () => beatmaps.GetAllUsableBeatmapSets().Any(b => b.OnlineID == 241526));
             AddUntilStep("button state downloaded", () => downloadButton.DownloadState == DownloadState.LocallyAvailable);
 
             createButtonWithBeatmap(createSoleily());
@@ -57,7 +57,7 @@ namespace osu.Game.Tests.Visual.Online
         {
             AddStep("remove soleily", () =>
             {
-                var beatmap = beatmaps.QueryBeatmapSet(b => b.OnlineBeatmapSetID == 241526);
+                var beatmap = beatmaps.QueryBeatmapSet(b => b.OnlineID == 241526);
 
                 if (beatmap != null) beatmaps.Delete(beatmap);
             });

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

@@ -64,7 +64,7 @@ namespace osu.Game.Tests.Visual.Online
 
             AddStep("Set beatmap", () => Beatmap.Value = new DummyWorkingBeatmap(Audio, null)
             {
-                BeatmapInfo = { OnlineBeatmapID = hasOnlineId ? 1234 : (int?)null }
+                BeatmapInfo = { OnlineID = hasOnlineId ? 1234 : (int?)null }
             });
 
             AddStep("Run command", () => Add(new NowPlayingCommand()));

osu.Game.Tests/Visual/Playlists/TestScenePlaylistsRoomCreation.cs

@@ -121,8 +121,8 @@ namespace osu.Game.Tests.Visual.Playlists
                 beatmap.BeatmapInfo.BaseDifficulty.CircleSize = 1;
 
                 // intentionally increment online IDs to clash with import below.
-                beatmap.BeatmapInfo.OnlineBeatmapID++;
-                beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID++;
+                beatmap.BeatmapInfo.OnlineID++;
+                beatmap.BeatmapInfo.BeatmapSet.OnlineID++;
 
                 importedSet = manager.Import(beatmap.BeatmapInfo.BeatmapSet).Result.Value;
             });

osu.Game.Tests/Visual/Ranking/TestSceneResultsScreen.cs

@@ -337,7 +337,7 @@ namespace osu.Game.Tests.Visual.Ranking
             public UnrankedSoloResultsScreen(ScoreInfo score)
                 : base(score, true)
             {
-                Score.BeatmapInfo.OnlineBeatmapID = 0;
+                Score.BeatmapInfo.OnlineID = 0;
                 Score.BeatmapInfo.Status = BeatmapSetOnlineStatus.Pending;
             }
 

osu.Game.Tests/Visual/SongSelect/TestSceneAdvancedStats.cs

@@ -46,7 +46,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                 OverallDifficulty = 5.7f,
                 ApproachRate = 3.5f
             },
-            StarDifficulty = 4.5f
+            StarRating = 4.5f
         };
 
         [Test]
@@ -76,7 +76,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                     OverallDifficulty = 4.5f,
                     ApproachRate = 3.1f
                 },
-                StarDifficulty = 8
+                StarRating = 8
             });
 
             AddAssert("first bar text is Key Count", () => advancedStats.ChildrenOfType<SpriteText>().First().Text == "Key Count");

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapCarousel.cs

@@ -435,8 +435,8 @@ namespace osu.Game.Tests.Visual.SongSelect
             for (int i = 0; i < 3; i++)
             {
                 var set = createTestBeatmapSet(i);
-                set.Beatmaps[0].StarDifficulty = 3 - i;
-                set.Beatmaps[2].StarDifficulty = 6 + i;
+                set.Beatmaps[0].StarRating = 3 - i;
+                set.Beatmaps[2].StarRating = 6 + i;
                 sets.Add(set);
             }
 
@@ -684,9 +684,9 @@ namespace osu.Game.Tests.Visual.SongSelect
                 {
                     set.Beatmaps.Add(new BeatmapInfo
                     {
-                        Version = $"Stars: {i}",
+                        DifficultyName = $"Stars: {i}",
                         Ruleset = new OsuRuleset().RulesetInfo,
-                        StarDifficulty = i,
+                        StarRating = i,
                     });
                 }
 
@@ -838,7 +838,7 @@ namespace osu.Game.Tests.Visual.SongSelect
             return new BeatmapSetInfo
             {
                 ID = id,
-                OnlineBeatmapSetID = id,
+                OnlineID = id,
                 Hash = new MemoryStream(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString())).ComputeMD5Hash(),
                 Metadata = new BeatmapMetadata
                 {
@@ -867,9 +867,9 @@ namespace osu.Game.Tests.Visual.SongSelect
 
                 yield return new BeatmapInfo
                 {
-                    OnlineBeatmapID = id++ * 10,
-                    Version = version,
-                    StarDifficulty = diff,
+                    OnlineID = id++ * 10,
+                    DifficultyName = version,
+                    StarRating = diff,
                     Ruleset = new OsuRuleset().RulesetInfo,
                     BaseDifficulty = new BeatmapDifficulty
                     {
@@ -884,7 +884,7 @@ namespace osu.Game.Tests.Visual.SongSelect
             var toReturn = new BeatmapSetInfo
             {
                 ID = id,
-                OnlineBeatmapSetID = id,
+                OnlineID = id,
                 Hash = new MemoryStream(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString())).ComputeMD5Hash(),
                 Metadata = new BeatmapMetadata
                 {
@@ -900,11 +900,11 @@ namespace osu.Game.Tests.Visual.SongSelect
             {
                 toReturn.Beatmaps.Add(new BeatmapInfo
                 {
-                    OnlineBeatmapID = b * 10,
+                    OnlineID = b * 10,
                     Path = $"extra{b}.osu",
-                    Version = $"Extra {b}",
+                    DifficultyName = $"Extra {b}",
                     Ruleset = rulesets.GetRuleset((b - 1) % 4),
-                    StarDifficulty = 2,
+                    StarRating = 2,
                     BaseDifficulty = new BeatmapDifficulty
                     {
                         OverallDifficulty = 3.5f,

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapInfoWedge.cs

@@ -198,8 +198,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                         Title = $"{ruleset.ShortName}Title"
                     },
                     Ruleset = ruleset,
-                    StarDifficulty = 6,
-                    Version = $"{ruleset.ShortName}Version",
+                    StarRating = 6,
+                    DifficultyName = $"{ruleset.ShortName}Version",
                     BaseDifficulty = new BeatmapDifficulty()
                 },
                 HitObjects = objects
@@ -219,7 +219,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                         Source = "Verrrrry long Source",
                         Title = "Verrrrry long Title"
                     },
-                    Version = "Verrrrrrrrrrrrrrrrrrrrrrrrrrrrry long Version",
+                    DifficultyName = "Verrrrrrrrrrrrrrrrrrrrrrrrrrrrry long Version",
                     Status = BeatmapSetOnlineStatus.Graveyard,
                 },
             };

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs

@@ -388,7 +388,7 @@ namespace osu.Game.Tests.Visual.SongSelect
         {
             leaderboard.BeatmapInfo = new BeatmapInfo
             {
-                OnlineBeatmapID = 1113057,
+                OnlineID = 1113057,
                 Status = status,
             };
         }

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapMetadataDisplay.cs

@@ -45,8 +45,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                     {
                         Title = title,
                     },
-                    Version = version,
-                    StarDifficulty = RNG.NextDouble(0, 10),
+                    DifficultyName = version,
+                    StarRating = RNG.NextDouble(0, 10),
                 }
             }));
         }
@@ -64,8 +64,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                     {
                         Title = "Heavy beatmap",
                     },
-                    Version = "10k objects",
-                    StarDifficulty = 99.99f,
+                    DifficultyName = "10k objects",
+                    StarRating = 99.99f,
                 }
             }));
 

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapRecommendations.cs

@@ -180,16 +180,16 @@ namespace osu.Game.Tests.Visual.SongSelect
             var beatmapSet = new BeatmapSetInfo
             {
                 Hash = Guid.NewGuid().ToString(),
-                OnlineBeatmapSetID = importID,
+                OnlineID = importID,
                 Metadata = metadata,
                 Beatmaps = difficultyRulesets.Select((ruleset, difficultyIndex) => new BeatmapInfo
                 {
-                    OnlineBeatmapID = importID * 1024 + difficultyIndex,
+                    OnlineID = importID * 1024 + difficultyIndex,
                     Metadata = metadata,
                     BaseDifficulty = new BeatmapDifficulty(),
                     Ruleset = ruleset,
-                    StarDifficulty = difficultyIndex + 1,
-                    Version = $"SR{difficultyIndex + 1}"
+                    StarRating = difficultyIndex + 1,
+                    DifficultyName = $"SR{difficultyIndex + 1}"
                 }).ToList()
             };
 
@@ -205,8 +205,8 @@ namespace osu.Game.Tests.Visual.SongSelect
             AddUntilStep("wait for song select", () => Game.ScreenStack.CurrentScreen is Screens.Select.SongSelect);
             AddUntilStep("recommended beatmap displayed", () =>
             {
-                int? expectedID = getImport().Beatmaps[expectedDiff - 1].OnlineBeatmapID;
-                return Game.Beatmap.Value.BeatmapInfo.OnlineBeatmapID == expectedID;
+                int? expectedID = getImport().Beatmaps[expectedDiff - 1].OnlineID;
+                return Game.Beatmap.Value.BeatmapInfo.OnlineID == expectedID;
             });
         }
     }

osu.Game.Tests/Visual/SongSelect/TestScenePlaySongSelect.cs

@@ -507,13 +507,13 @@ namespace osu.Game.Tests.Visual.SongSelect
                     i.IsFiltered || i.Item.BeatmapInfo.Ruleset.ID == targetRuleset || i.Item.BeatmapInfo.Ruleset.ID == 0);
             });
 
-            AddUntilStep("carousel has correct", () => songSelect.Carousel.SelectedBeatmapInfo?.OnlineBeatmapID == target.OnlineBeatmapID);
-            AddUntilStep("game has correct", () => Beatmap.Value.BeatmapInfo.OnlineBeatmapID == target.OnlineBeatmapID);
+            AddUntilStep("carousel has correct", () => songSelect.Carousel.SelectedBeatmapInfo?.OnlineID == target.OnlineID);
+            AddUntilStep("game has correct", () => Beatmap.Value.BeatmapInfo.OnlineID == target.OnlineID);
 
             AddStep("reset filter text", () => songSelect.FilterControl.ChildrenOfType<SearchTextBox>().First().Text = string.Empty);
 
-            AddAssert("game still correct", () => Beatmap.Value?.BeatmapInfo.OnlineBeatmapID == target.OnlineBeatmapID);
-            AddAssert("carousel still correct", () => songSelect.Carousel.SelectedBeatmapInfo.OnlineBeatmapID == target.OnlineBeatmapID);
+            AddAssert("game still correct", () => Beatmap.Value?.BeatmapInfo.OnlineID == target.OnlineID);
+            AddAssert("carousel still correct", () => songSelect.Carousel.SelectedBeatmapInfo.OnlineID == target.OnlineID);
         }
 
         [Test]
@@ -544,8 +544,8 @@ namespace osu.Game.Tests.Visual.SongSelect
 
             AddUntilStep("has selection", () => songSelect.Carousel.SelectedBeatmapInfo != null);
 
-            AddUntilStep("carousel has correct", () => songSelect.Carousel.SelectedBeatmapInfo?.OnlineBeatmapID == target.OnlineBeatmapID);
-            AddUntilStep("game has correct", () => Beatmap.Value.BeatmapInfo.OnlineBeatmapID == target.OnlineBeatmapID);
+            AddUntilStep("carousel has correct", () => songSelect.Carousel.SelectedBeatmapInfo?.OnlineID == target.OnlineID);
+            AddUntilStep("game has correct", () => Beatmap.Value.BeatmapInfo.OnlineID == target.OnlineID);
 
             AddStep("set filter text", () => songSelect.FilterControl.ChildrenOfType<SearchTextBox>().First().Text = "nononoo");
 
@@ -918,8 +918,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                 beatmaps.Add(new BeatmapInfo
                 {
                     Ruleset = getRuleset(),
-                    OnlineBeatmapID = beatmapId,
-                    Version = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
+                    OnlineID = beatmapId,
+                    DifficultyName = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
                     Length = length,
                     BPM = bpm,
                     BaseDifficulty = new BeatmapDifficulty
@@ -931,7 +931,7 @@ namespace osu.Game.Tests.Visual.SongSelect
 
             return new BeatmapSetInfo
             {
-                OnlineBeatmapSetID = setId,
+                OnlineID = setId,
                 Hash = new MemoryStream(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString())).ComputeMD5Hash(),
                 Metadata = new BeatmapMetadata
                 {

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

@@ -69,7 +69,7 @@ namespace osu.Game.Tests.Visual.UserInterface
                                     Username = "TestAuthor"
                                 },
                             },
-                            Version = "Insane"
+                            DifficultyName = "Insane"
                         },
                     }
                 },

osu.Game/Audio/PreviewTrackManager.cs

@@ -1,13 +1,8 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Threading.Tasks;
 using osu.Framework.Allocation;
 using osu.Framework.Audio;
-using osu.Framework.Audio.Mixing;
 using osu.Framework.Audio.Track;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
@@ -19,27 +14,26 @@ namespace osu.Game.Audio
 {
     public class PreviewTrackManager : Component
     {
+        private readonly IAdjustableAudioComponent mainTrackAdjustments;
+
         private readonly BindableDouble muteBindable = new BindableDouble();
 
         [Resolved]
         private AudioManager audio { get; set; }
 
-        private PreviewTrackStore trackStore;
+        private ITrackStore trackStore;
 
         protected TrackManagerPreviewTrack CurrentTrack;
 
-        private readonly BindableNumber<double> globalTrackVolumeAdjust = new BindableNumber<double>(OsuGameBase.GLOBAL_TRACK_VOLUME_ADJUST);
+        public PreviewTrackManager(IAdjustableAudioComponent mainTrackAdjustments)
+        {
+            this.mainTrackAdjustments = mainTrackAdjustments;
+        }
 
         [BackgroundDependencyLoader]
         private void load(AudioManager audioManager)
         {
-            // this is a temporary solution to get around muting ourselves.
-            // todo: update this once we have a BackgroundTrackManager or similar.
-            trackStore = new PreviewTrackStore(audioManager.TrackMixer, new OnlineStore());
-
-            audio.AddItem(trackStore);
-            trackStore.AddAdjustment(AdjustableProperty.Volume, globalTrackVolumeAdjust);
-            trackStore.AddAdjustment(AdjustableProperty.Volume, audio.VolumeTrack);
+            trackStore = audioManager.GetTrackStore(new OnlineStore());
         }
 
         /// <summary>
@@ -55,7 +49,7 @@ namespace osu.Game.Audio
             {
                 CurrentTrack?.Stop();
                 CurrentTrack = track;
-                audio.Tracks.AddAdjustment(AdjustableProperty.Volume, muteBindable);
+                mainTrackAdjustments.AddAdjustment(AdjustableProperty.Volume, muteBindable);
             });
 
             track.Stopped += () => Schedule(() =>
@@ -64,7 +58,7 @@ namespace osu.Game.Audio
                     return;
 
                 CurrentTrack = null;
-                audio.Tracks.RemoveAdjustment(AdjustableProperty.Volume, muteBindable);
+                mainTrackAdjustments.RemoveAdjustment(AdjustableProperty.Volume, muteBindable);
             });
 
             return track;
@@ -116,52 +110,5 @@ namespace osu.Game.Audio
 
             protected override Track GetTrack() => trackManager.Get($"https://b.ppy.sh/preview/{beatmapSetInfo.OnlineID}.mp3");
         }
-
-        private class PreviewTrackStore : AudioCollectionManager<AdjustableAudioComponent>, ITrackStore
-        {
-            private readonly AudioMixer defaultMixer;
-            private readonly IResourceStore<byte[]> store;
-
-            internal PreviewTrackStore(AudioMixer defaultMixer, IResourceStore<byte[]> store)
-            {
-                this.defaultMixer = defaultMixer;
-                this.store = store;
-            }
-
-            public Track GetVirtual(double length = double.PositiveInfinity)
-            {
-                if (IsDisposed) throw new ObjectDisposedException($"Cannot retrieve items for an already disposed {nameof(PreviewTrackStore)}");
-
-                var track = new TrackVirtual(length);
-                AddItem(track);
-                return track;
-            }
-
-            public Track Get(string name)
-            {
-                if (IsDisposed) throw new ObjectDisposedException($"Cannot retrieve items for an already disposed {nameof(PreviewTrackStore)}");
-
-                if (string.IsNullOrEmpty(name)) return null;
-
-                var dataStream = store.GetStream(name);
-
-                if (dataStream == null)
-                    return null;
-
-                // Todo: This is quite unsafe. TrackBass shouldn't be exposed as public.
-                Track track = new TrackBass(dataStream);
-
-                defaultMixer.Add(track);
-                AddItem(track);
-
-                return track;
-            }
-
-            public Task<Track> GetAsync(string name) => Task.Run(() => Get(name));
-
-            public Stream GetStream(string name) => store.GetStream(name);
-
-            public IEnumerable<string> GetAvailableResources() => store.GetAvailableResources();
-        }
     }
 }

osu.Game/Beatmaps/Beatmap.cs

@@ -56,7 +56,7 @@ namespace osu.Game.Beatmaps
                     Title = @"Unknown",
                     AuthorString = @"Unknown Creator",
                 },
-                Version = @"Normal",
+                DifficultyName = @"Normal",
                 BaseDifficulty = Difficulty,
             };
         }

osu.Game/Beatmaps/BeatmapDifficultyCache.cs

@@ -290,7 +290,7 @@ namespace osu.Game.Beatmaps
             catch (BeatmapInvalidForRulesetException e)
             {
                 if (rulesetInfo.Equals(beatmapInfo.Ruleset))
-                    Logger.Error(e, $"Failed to convert {beatmapInfo.OnlineBeatmapID} to the beatmap's default ruleset ({beatmapInfo.Ruleset}).");
+                    Logger.Error(e, $"Failed to convert {beatmapInfo.OnlineID} to the beatmap's default ruleset ({beatmapInfo.Ruleset}).");
 
                 return new StarDifficulty();
             }

osu.Game/Beatmaps/BeatmapInfo.cs

@@ -23,13 +23,14 @@ namespace osu.Game.Beatmaps
 
         public int BeatmapVersion;
 
-        private int? onlineBeatmapID;
+        private int? onlineID;
 
         [JsonProperty("id")]
-        public int? OnlineBeatmapID
+        [Column("OnlineBeatmapID")]
+        public int? OnlineID
         {
-            get => onlineBeatmapID;
-            set => onlineBeatmapID = value > 0 ? value : null;
+            get => onlineID;
+            set => onlineID = value > 0 ? value : null;
         }
 
         [JsonIgnore]
@@ -134,12 +135,12 @@ namespace osu.Game.Beatmaps
         public double TimelineZoom { get; set; }
 
         // Metadata
-        public string Version { get; set; }
-
-        private string versionString => string.IsNullOrEmpty(Version) ? string.Empty : $"[{Version}]";
+        [Column("Version")]
+        public string DifficultyName { get; set; }
 
         [JsonProperty("difficulty_rating")]
-        public double StarDifficulty { get; set; }
+        [Column("StarDifficulty")]
+        public double StarRating { get; set; }
 
         /// <summary>
         /// Currently only populated for beatmap deletion. Use <see cref="ScoreManager"/> to query scores.
@@ -147,7 +148,7 @@ namespace osu.Game.Beatmaps
         public List<ScoreInfo> Scores { get; set; }
 
         [JsonIgnore]
-        public DifficultyRating DifficultyRating => BeatmapDifficultyCache.GetDifficultyRating(StarDifficulty);
+        public DifficultyRating DifficultyRating => BeatmapDifficultyCache.GetDifficultyRating(StarRating);
 
         public override string ToString() => this.GetDisplayTitle();
 
@@ -176,15 +177,12 @@ namespace osu.Game.Beatmaps
 
         #region Implementation of IHasOnlineID
 
-        public int OnlineID => OnlineBeatmapID ?? -1;
+        int IHasOnlineID<int>.OnlineID => OnlineID ?? -1;
 
         #endregion
 
         #region Implementation of IBeatmapInfo
 
-        [JsonIgnore]
-        string IBeatmapInfo.DifficultyName => Version;
-
         [JsonIgnore]
         IBeatmapMetadataInfo IBeatmapInfo.Metadata => Metadata ?? BeatmapSet?.Metadata ?? new BeatmapMetadata();
 
@@ -197,9 +195,6 @@ namespace osu.Game.Beatmaps
         [JsonIgnore]
         IRulesetInfo IBeatmapInfo.Ruleset => Ruleset;
 
-        [JsonIgnore]
-        double IBeatmapInfo.StarRating => StarDifficulty;
-
         #endregion
     }
 }

osu.Game/Beatmaps/BeatmapInfoExtensions.cs

@@ -11,7 +11,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// A user-presentable display title representing this beatmap.
         /// </summary>
-        public static string GetDisplayTitle(this IBeatmapInfo beatmapInfo) => $"{beatmapInfo.Metadata} {getVersionString(beatmapInfo)}".Trim();
+        public static string GetDisplayTitle(this IBeatmapInfo beatmapInfo) => $"{beatmapInfo.Metadata.GetDisplayTitle()} {getVersionString(beatmapInfo)}".Trim();
 
         /// <summary>
         /// A user-presentable display title representing this beatmap, with localisation handling for potentially romanisable fields.

osu.Game/Beatmaps/BeatmapManager.cs

@@ -10,6 +10,8 @@ using System.Threading;
 using System.Threading.Tasks;
 using JetBrains.Annotations;
 using osu.Framework.Audio;
+using osu.Framework.Audio.Mixing;
+using osu.Framework.Audio.Track;
 using osu.Framework.IO.Stores;
 using osu.Framework.Platform;
 using osu.Framework.Testing;
@@ -30,18 +32,23 @@ namespace osu.Game.Beatmaps
     [ExcludeFromDynamicCompile]
     public class BeatmapManager : IModelDownloader<IBeatmapSetInfo>, IModelManager<BeatmapSetInfo>, IModelFileManager<BeatmapSetInfo, BeatmapSetFileInfo>, IModelImporter<BeatmapSetInfo>, IWorkingBeatmapCache, IDisposable
     {
+        public ITrackStore BeatmapTrackStore { get; }
+
         private readonly BeatmapModelManager beatmapModelManager;
         private readonly BeatmapModelDownloader beatmapModelDownloader;
 
         private readonly WorkingBeatmapCache workingBeatmapCache;
         private readonly BeatmapOnlineLookupQueue onlineBeatmapLookupQueue;
 
-        public BeatmapManager(Storage storage, IDatabaseContextFactory contextFactory, RulesetStore rulesets, IAPIProvider api, [NotNull] AudioManager audioManager, IResourceStore<byte[]> resources, GameHost host = null,
-                              WorkingBeatmap defaultBeatmap = null, bool performOnlineLookups = false)
+        public BeatmapManager(Storage storage, IDatabaseContextFactory contextFactory, RulesetStore rulesets, IAPIProvider api, [NotNull] AudioManager audioManager, IResourceStore<byte[]> gameResources, GameHost host = null, WorkingBeatmap defaultBeatmap = null, bool performOnlineLookups = false, AudioMixer mainTrackMixer = null)
         {
+            var userResources = new FileStore(contextFactory, storage).Store;
+
+            BeatmapTrackStore = audioManager.GetTrackStore(userResources);
+
             beatmapModelManager = CreateBeatmapModelManager(storage, contextFactory, rulesets, api, host);
             beatmapModelDownloader = CreateBeatmapModelDownloader(beatmapModelManager, api, host);
-            workingBeatmapCache = CreateWorkingBeatmapCache(audioManager, resources, new FileStore(contextFactory, storage).Store, defaultBeatmap, host);
+            workingBeatmapCache = CreateWorkingBeatmapCache(audioManager, gameResources, userResources, defaultBeatmap, host);
 
             workingBeatmapCache.BeatmapManager = beatmapModelManager;
             beatmapModelManager.WorkingBeatmapCache = workingBeatmapCache;
@@ -58,8 +65,10 @@ namespace osu.Game.Beatmaps
             return new BeatmapModelDownloader(modelManager, api, host);
         }
 
-        protected virtual WorkingBeatmapCache CreateWorkingBeatmapCache(AudioManager audioManager, IResourceStore<byte[]> resources, IResourceStore<byte[]> storage, WorkingBeatmap defaultBeatmap, GameHost host) =>
-            new WorkingBeatmapCache(audioManager, resources, storage, defaultBeatmap, host);
+        protected virtual WorkingBeatmapCache CreateWorkingBeatmapCache(AudioManager audioManager, IResourceStore<byte[]> resources, IResourceStore<byte[]> storage, WorkingBeatmap defaultBeatmap, GameHost host)
+        {
+            return new WorkingBeatmapCache(BeatmapTrackStore, audioManager, resources, storage, defaultBeatmap, host);
+        }
 
         protected virtual BeatmapModelManager CreateBeatmapModelManager(Storage storage, IDatabaseContextFactory contextFactory, RulesetStore rulesets, IAPIProvider api, GameHost host) =>
             new BeatmapModelManager(storage, contextFactory, rulesets, host);

osu.Game/Beatmaps/BeatmapMetadataInfoExtensions.cs

@@ -27,8 +27,12 @@ namespace osu.Game.Beatmaps
         /// </summary>
         public static string GetDisplayTitle(this IBeatmapMetadataInfo metadataInfo)
         {
-            string author = string.IsNullOrEmpty(metadataInfo.Author.Username) ? string.Empty : $"({metadataInfo.Author})";
-            return $"{metadataInfo.Artist} - {metadataInfo.Title} {author}".Trim();
+            string author = string.IsNullOrEmpty(metadataInfo.Author.Username) ? string.Empty : $" ({metadataInfo.Author.Username})";
+
+            string artist = string.IsNullOrEmpty(metadataInfo.Artist) ? "unknown artist" : metadataInfo.Artist;
+            string title = string.IsNullOrEmpty(metadataInfo.Title) ? "unknown title" : metadataInfo.Title;
+
+            return $"{artist} - {title}{author}".Trim();
         }
 
         /// <summary>

osu.Game/Beatmaps/BeatmapModelManager.cs

@@ -94,17 +94,17 @@ namespace osu.Game.Beatmaps
 
             validateOnlineIds(beatmapSet);
 
-            bool hadOnlineBeatmapIDs = beatmapSet.Beatmaps.Any(b => b.OnlineBeatmapID > 0);
+            bool hadOnlineIDs = beatmapSet.Beatmaps.Any(b => b.OnlineID > 0);
 
             if (OnlineLookupQueue != null)
                 await OnlineLookupQueue.UpdateAsync(beatmapSet, cancellationToken).ConfigureAwait(false);
 
             // ensure at least one beatmap was able to retrieve or keep an online ID, else drop the set ID.
-            if (hadOnlineBeatmapIDs && !beatmapSet.Beatmaps.Any(b => b.OnlineBeatmapID > 0))
+            if (hadOnlineIDs && !beatmapSet.Beatmaps.Any(b => b.OnlineID > 0))
             {
-                if (beatmapSet.OnlineBeatmapSetID != null)
+                if (beatmapSet.OnlineID != null)
                 {
-                    beatmapSet.OnlineBeatmapSetID = null;
+                    beatmapSet.OnlineID = null;
                     LogForModel(beatmapSet, "Disassociating beatmap set ID due to loss of all beatmap IDs");
                 }
             }
@@ -116,27 +116,27 @@ namespace osu.Game.Beatmaps
                 throw new InvalidOperationException($"Cannot import {nameof(BeatmapInfo)} with null {nameof(BeatmapInfo.BaseDifficulty)}.");
 
             // check if a set already exists with the same online id, delete if it does.
-            if (beatmapSet.OnlineBeatmapSetID != null)
+            if (beatmapSet.OnlineID != null)
             {
-                var existingSetWithSameOnlineID = beatmaps.ConsumableItems.FirstOrDefault(b => b.OnlineBeatmapSetID == beatmapSet.OnlineBeatmapSetID);
+                var existingSetWithSameOnlineID = beatmaps.ConsumableItems.FirstOrDefault(b => b.OnlineID == beatmapSet.OnlineID);
 
                 if (existingSetWithSameOnlineID != null)
                 {
                     Delete(existingSetWithSameOnlineID);
 
                     // in order to avoid a unique key constraint, immediately remove the online ID from the previous set.
-                    existingSetWithSameOnlineID.OnlineBeatmapSetID = null;
+                    existingSetWithSameOnlineID.OnlineID = null;
                     foreach (var b in existingSetWithSameOnlineID.Beatmaps)
-                        b.OnlineBeatmapID = null;
+                        b.OnlineID = null;
 
-                    LogForModel(beatmapSet, $"Found existing beatmap set with same OnlineBeatmapSetID ({beatmapSet.OnlineBeatmapSetID}). It has been deleted.");
+                    LogForModel(beatmapSet, $"Found existing beatmap set with same OnlineBeatmapSetID ({beatmapSet.OnlineID}). It has been deleted.");
                 }
             }
         }
 
         private void validateOnlineIds(BeatmapSetInfo beatmapSet)
         {
-            var beatmapIds = beatmapSet.Beatmaps.Where(b => b.OnlineBeatmapID.HasValue).Select(b => b.OnlineBeatmapID).ToList();
+            var beatmapIds = beatmapSet.Beatmaps.Where(b => b.OnlineID.HasValue).Select(b => b.OnlineID).ToList();
 
             // ensure all IDs are unique
             if (beatmapIds.GroupBy(b => b).Any(g => g.Count() > 1))
@@ -147,7 +147,7 @@ namespace osu.Game.Beatmaps
             }
 
             // find any existing beatmaps in the database that have matching online ids
-            var existingBeatmaps = QueryBeatmaps(b => beatmapIds.Contains(b.OnlineBeatmapID)).ToList();
+            var existingBeatmaps = QueryBeatmaps(b => beatmapIds.Contains(b.OnlineID)).ToList();
 
             if (existingBeatmaps.Count > 0)
             {
@@ -162,7 +162,7 @@ namespace osu.Game.Beatmaps
                 }
             }
 
-            void resetIds() => beatmapSet.Beatmaps.ForEach(b => b.OnlineBeatmapID = null);
+            void resetIds() => beatmapSet.Beatmaps.ForEach(b => b.OnlineID = null);
         }
 
         /// <summary>
@@ -215,7 +215,7 @@ namespace osu.Game.Beatmaps
                     var fileInfo = setInfo.Files.SingleOrDefault(f => string.Equals(f.Filename, beatmapInfo.Path, StringComparison.OrdinalIgnoreCase)) ?? new BeatmapSetFileInfo();
 
                     // metadata may have changed; update the path with the standard format.
-                    beatmapInfo.Path = GetValidFilename($"{metadata.Artist} - {metadata.Title} ({metadata.Author}) [{beatmapInfo.Version}].osu");
+                    beatmapInfo.Path = GetValidFilename($"{metadata.Artist} - {metadata.Title} ({metadata.Author}) [{beatmapInfo.DifficultyName}].osu");
 
                     beatmapInfo.MD5Hash = stream.ComputeMD5Hash();
 
@@ -242,7 +242,7 @@ namespace osu.Game.Beatmaps
             if (!base.CanSkipImport(existing, import))
                 return false;
 
-            return existing.Beatmaps.Any(b => b.OnlineBeatmapID != null);
+            return existing.Beatmaps.Any(b => b.OnlineID != null);
         }
 
         protected override bool CanReuseExisting(BeatmapSetInfo existing, BeatmapSetInfo import)
@@ -250,11 +250,11 @@ namespace osu.Game.Beatmaps
             if (!base.CanReuseExisting(existing, import))
                 return false;
 
-            var existingIds = existing.Beatmaps.Select(b => b.OnlineBeatmapID).OrderBy(i => i);
-            var importIds = import.Beatmaps.Select(b => b.OnlineBeatmapID).OrderBy(i => i);
+            var existingIds = existing.Beatmaps.Select(b => b.OnlineID).OrderBy(i => i);
+            var importIds = import.Beatmaps.Select(b => b.OnlineID).OrderBy(i => i);
 
             // force re-import if we are not in a sane state.
-            return existing.OnlineBeatmapSetID == import.OnlineBeatmapSetID && existingIds.SequenceEqual(importIds);
+            return existing.OnlineID == import.OnlineID && existingIds.SequenceEqual(importIds);
         }
 
         /// <summary>
@@ -349,7 +349,7 @@ namespace osu.Game.Beatmaps
 
         protected override bool CheckLocalAvailability(BeatmapSetInfo model, IQueryable<BeatmapSetInfo> items)
             => base.CheckLocalAvailability(model, items)
-               || (model.OnlineBeatmapSetID != null && items.Any(b => b.OnlineBeatmapSetID == model.OnlineBeatmapSetID));
+               || (model.OnlineID != null && items.Any(b => b.OnlineID == model.OnlineID));
 
         protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
         {
@@ -368,7 +368,7 @@ namespace osu.Game.Beatmaps
 
             return new BeatmapSetInfo
             {
-                OnlineBeatmapSetID = beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID,
+                OnlineID = beatmap.BeatmapInfo.BeatmapSet?.OnlineID,
                 Beatmaps = new List<BeatmapInfo>(),
                 Metadata = beatmap.Metadata,
                 DateAdded = DateTimeOffset.UtcNow
@@ -407,7 +407,7 @@ namespace osu.Game.Beatmaps
                     beatmap.BeatmapInfo.Ruleset = ruleset;
 
                     // TODO: this should be done in a better place once we actually need to dynamically update it.
-                    beatmap.BeatmapInfo.StarDifficulty = ruleset?.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating ?? 0;
+                    beatmap.BeatmapInfo.StarRating = ruleset?.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating ?? 0;
                     beatmap.BeatmapInfo.Length = calculateLength(beatmap);
                     beatmap.BeatmapInfo.BPM = 60000 / beatmap.GetMostCommonBeatLength();
 

osu.Game/Beatmaps/BeatmapOnlineLookupQueue.cs

@@ -84,8 +84,8 @@ namespace osu.Game.Beatmaps
                 {
                     beatmapInfo.Status = res.Status;
                     beatmapInfo.BeatmapSet.Status = res.BeatmapSet?.Status ?? BeatmapSetOnlineStatus.None;
-                    beatmapInfo.BeatmapSet.OnlineBeatmapSetID = res.OnlineBeatmapSetID;
-                    beatmapInfo.OnlineBeatmapID = res.OnlineID;
+                    beatmapInfo.BeatmapSet.OnlineID = res.OnlineBeatmapSetID;
+                    beatmapInfo.OnlineID = res.OnlineID;
 
                     if (beatmapInfo.Metadata != null)
                         beatmapInfo.Metadata.AuthorID = res.AuthorID;
@@ -103,7 +103,7 @@ namespace osu.Game.Beatmaps
 
             void fail(Exception e)
             {
-                beatmapInfo.OnlineBeatmapID = null;
+                beatmapInfo.OnlineID = null;
                 logForModel(set, $"Online retrieval failed for {beatmapInfo} ({e.Message})");
             }
         }
@@ -161,7 +161,7 @@ namespace osu.Game.Beatmaps
 
             if (string.IsNullOrEmpty(beatmapInfo.MD5Hash)
                 && string.IsNullOrEmpty(beatmapInfo.Path)
-                && beatmapInfo.OnlineBeatmapID == null)
+                && beatmapInfo.OnlineID == null)
                 return false;
 
             try
@@ -172,10 +172,10 @@ namespace osu.Game.Beatmaps
 
                     using (var cmd = db.CreateCommand())
                     {
-                        cmd.CommandText = "SELECT beatmapset_id, beatmap_id, approved, user_id FROM osu_beatmaps WHERE checksum = @MD5Hash OR beatmap_id = @OnlineBeatmapID OR filename = @Path";
+                        cmd.CommandText = "SELECT beatmapset_id, beatmap_id, approved, user_id FROM osu_beatmaps WHERE checksum = @MD5Hash OR beatmap_id = @OnlineID OR filename = @Path";
 
                         cmd.Parameters.Add(new SqliteParameter("@MD5Hash", beatmapInfo.MD5Hash));
-                        cmd.Parameters.Add(new SqliteParameter("@OnlineBeatmapID", beatmapInfo.OnlineBeatmapID ?? (object)DBNull.Value));
+                        cmd.Parameters.Add(new SqliteParameter("@OnlineID", beatmapInfo.OnlineID ?? (object)DBNull.Value));
                         cmd.Parameters.Add(new SqliteParameter("@Path", beatmapInfo.Path));
 
                         using (var reader = cmd.ExecuteReader())
@@ -186,8 +186,8 @@ namespace osu.Game.Beatmaps
 
                                 beatmapInfo.Status = status;
                                 beatmapInfo.BeatmapSet.Status = status;
-                                beatmapInfo.BeatmapSet.OnlineBeatmapSetID = reader.GetInt32(0);
-                                beatmapInfo.OnlineBeatmapID = reader.GetInt32(1);
+                                beatmapInfo.BeatmapSet.OnlineID = reader.GetInt32(0);
+                                beatmapInfo.OnlineID = reader.GetInt32(1);
 
                                 if (beatmapInfo.Metadata != null)
                                     beatmapInfo.Metadata.AuthorID = reader.GetInt32(3);

osu.Game/Beatmaps/BeatmapSetInfo.cs

@@ -16,12 +16,13 @@ namespace osu.Game.Beatmaps
     {
         public int ID { get; set; }
 
-        private int? onlineBeatmapSetID;
+        private int? onlineID;
 
-        public int? OnlineBeatmapSetID
+        [Column("OnlineBeatmapSetID")]
+        public int? OnlineID
         {
-            get => onlineBeatmapSetID;
-            set => onlineBeatmapSetID = value > 0 ? value : null;
+            get => onlineID;
+            set => onlineID = value > 0 ? value : null;
         }
 
         public DateTimeOffset DateAdded { get; set; }
@@ -38,7 +39,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// The maximum star difficulty of all beatmaps in this set.
         /// </summary>
-        public double MaxStarDifficulty => Beatmaps?.Max(b => b.StarDifficulty) ?? 0;
+        public double MaxStarDifficulty => Beatmaps?.Max(b => b.StarRating) ?? 0;
 
         /// <summary>
         /// The maximum playable length in milliseconds of all beatmaps in this set.
@@ -74,8 +75,8 @@ namespace osu.Game.Beatmaps
             if (ID != 0 && other.ID != 0)
                 return ID == other.ID;
 
-            if (OnlineBeatmapSetID.HasValue && other.OnlineBeatmapSetID.HasValue)
-                return OnlineBeatmapSetID == other.OnlineBeatmapSetID;
+            if (OnlineID.HasValue && other.OnlineID.HasValue)
+                return OnlineID == other.OnlineID;
 
             if (!string.IsNullOrEmpty(Hash) && !string.IsNullOrEmpty(other.Hash))
                 return Hash == other.Hash;
@@ -85,7 +86,7 @@ namespace osu.Game.Beatmaps
 
         #region Implementation of IHasOnlineID
 
-        public int OnlineID => OnlineBeatmapSetID ?? -1;
+        int IHasOnlineID<int>.OnlineID => OnlineID ?? -1;
 
         #endregion
 

osu.Game/Beatmaps/DifficultyRecommender.cs

@@ -64,7 +64,7 @@ namespace osu.Game.Beatmaps
 
                 BeatmapInfo beatmapInfo = beatmaps.Where(b => b.Ruleset.Equals(r)).OrderBy(b =>
                 {
-                    double difference = b.StarDifficulty - recommendation;
+                    double difference = b.StarRating - recommendation;
                     return difference >= 0 ? difference * 2 : difference * -1; // prefer easier over harder
                 }).FirstOrDefault();
 

osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

@@ -251,7 +251,7 @@ namespace osu.Game.Beatmaps.Formats
                     break;
 
                 case @"Version":
-                    beatmap.BeatmapInfo.Version = pair.Value;
+                    beatmap.BeatmapInfo.DifficultyName = pair.Value;
                     break;
 
                 case @"Source":
@@ -263,11 +263,11 @@ namespace osu.Game.Beatmaps.Formats
                     break;
 
                 case @"BeatmapID":
-                    beatmap.BeatmapInfo.OnlineBeatmapID = Parsing.ParseInt(pair.Value);
+                    beatmap.BeatmapInfo.OnlineID = Parsing.ParseInt(pair.Value);
                     break;
 
                 case @"BeatmapSetID":
-                    beatmap.BeatmapInfo.BeatmapSet = new BeatmapSetInfo { OnlineBeatmapSetID = Parsing.ParseInt(pair.Value) };
+                    beatmap.BeatmapInfo.BeatmapSet = new BeatmapSetInfo { OnlineID = Parsing.ParseInt(pair.Value) };
                     break;
             }
         }

osu.Game/Beatmaps/Formats/LegacyBeatmapEncoder.cs

@@ -130,11 +130,11 @@ namespace osu.Game.Beatmaps.Formats
             writer.WriteLine(FormattableString.Invariant($"Artist: {beatmap.Metadata.Artist}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.ArtistUnicode)) writer.WriteLine(FormattableString.Invariant($"ArtistUnicode: {beatmap.Metadata.ArtistUnicode}"));
             writer.WriteLine(FormattableString.Invariant($"Creator: {beatmap.Metadata.Author.Username}"));
-            writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.Version}"));
+            writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.DifficultyName}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.Source)) writer.WriteLine(FormattableString.Invariant($"Source: {beatmap.Metadata.Source}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.Tags)) writer.WriteLine(FormattableString.Invariant($"Tags: {beatmap.Metadata.Tags}"));
-            if (beatmap.BeatmapInfo.OnlineBeatmapID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapID: {beatmap.BeatmapInfo.OnlineBeatmapID}"));
-            if (beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapSetID: {beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID}"));
+            if (beatmap.BeatmapInfo.OnlineID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapID: {beatmap.BeatmapInfo.OnlineID}"));
+            if (beatmap.BeatmapInfo.BeatmapSet?.OnlineID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapSetID: {beatmap.BeatmapInfo.BeatmapSet.OnlineID}"));
         }
 
         private void handleDifficulty(TextWriter writer)

osu.Game/Beatmaps/WorkingBeatmapCache.cs

@@ -41,7 +41,7 @@ namespace osu.Game.Beatmaps
         [CanBeNull]
         private readonly GameHost host;
 
-        public WorkingBeatmapCache([NotNull] AudioManager audioManager, IResourceStore<byte[]> resources, IResourceStore<byte[]> files, WorkingBeatmap defaultBeatmap = null, GameHost host = null)
+        public WorkingBeatmapCache(ITrackStore trackStore, AudioManager audioManager, IResourceStore<byte[]> resources, IResourceStore<byte[]> files, WorkingBeatmap defaultBeatmap = null, GameHost host = null)
         {
             DefaultBeatmap = defaultBeatmap;
 
@@ -50,7 +50,7 @@ namespace osu.Game.Beatmaps
             this.host = host;
             this.files = files;
             largeTextureStore = new LargeTextureStore(host?.CreateTextureLoaderStore(files));
-            trackStore = audioManager.GetTrackStore(files);
+            this.trackStore = trackStore;
         }
 
         public void Invalidate(BeatmapSetInfo info)

osu.Game/Database/ArchiveModelManager.cs

@@ -15,6 +15,7 @@ using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Framework.Threading;
+using osu.Game.Extensions;
 using osu.Game.IO;
 using osu.Game.IO.Archives;
 using osu.Game.IPC;
@@ -192,7 +193,7 @@ namespace osu.Game.Database
             else
             {
                 notification.CompletionText = imported.Count == 1
-                    ? $"Imported {imported.First().Value}!"
+                    ? $"Imported {imported.First().Value.GetDisplayString()}!"
                     : $"Imported {imported.Count} {HumanisedModelName}s!";
 
                 if (imported.Count > 0 && PostImport != null)
@@ -263,7 +264,7 @@ namespace osu.Game.Database
                 model = CreateModel(archive);
 
                 if (model == null)
-                    return Task.FromResult<ILive<TModel>>(new EntityFrameworkLive<TModel>(null));
+                    return Task.FromResult<ILive<TModel>>(null);
             }
             catch (TaskCanceledException)
             {

osu.Game/Database/IModelImporter.cs

@@ -7,6 +7,8 @@ using System.Threading.Tasks;
 using osu.Game.IO.Archives;
 using osu.Game.Overlays.Notifications;
 
+#nullable enable
+
 namespace osu.Game.Database
 {
     /// <summary>
@@ -26,7 +28,7 @@ namespace osu.Game.Database
         /// <param name="lowPriority">Whether this is a low priority import.</param>
         /// <param name="cancellationToken">An optional cancellation token.</param>
         /// <returns>The imported model, if successful.</returns>
-        Task<ILive<TModel>> Import(ImportTask task, bool lowPriority = false, CancellationToken cancellationToken = default);
+        Task<ILive<TModel>?> Import(ImportTask task, bool lowPriority = false, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Silently import an item from an <see cref="ArchiveReader"/>.
@@ -34,7 +36,7 @@ namespace osu.Game.Database
         /// <param name="archive">The archive to be imported.</param>
         /// <param name="lowPriority">Whether this is a low priority import.</param>
         /// <param name="cancellationToken">An optional cancellation token.</param>
-        Task<ILive<TModel>> Import(ArchiveReader archive, bool lowPriority = false, CancellationToken cancellationToken = default);
+        Task<ILive<TModel>?> Import(ArchiveReader archive, bool lowPriority = false, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Silently import an item from a <typeparamref name="TModel"/>.
@@ -43,7 +45,7 @@ namespace osu.Game.Database
         /// <param name="archive">An optional archive to use for model population.</param>
         /// <param name="lowPriority">Whether this is a low priority import.</param>
         /// <param name="cancellationToken">An optional cancellation token.</param>
-        Task<ILive<TModel>> Import(TModel item, ArchiveReader archive = null, bool lowPriority = false, CancellationToken cancellationToken = default);
+        Task<ILive<TModel>?> Import(TModel item, ArchiveReader? archive = null, bool lowPriority = false, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// A user displayable name for the model type associated with this manager.

osu.Game/Database/ImportTask.cs

@@ -47,10 +47,30 @@ namespace osu.Game.Database
         /// </summary>
         public ArchiveReader GetReader()
         {
-            if (Stream != null)
-                return new ZipArchiveReader(Stream, Path);
+            return Stream != null
+                ? getReaderFrom(Stream)
+                : getReaderFrom(Path);
+        }
 
-            return getReaderFrom(Path);
+        /// <summary>
+        /// Creates an <see cref="ArchiveReader"/> from a stream.
+        /// </summary>
+        /// <param name="stream">A seekable stream containing the archive content.</param>
+        /// <returns>A reader giving access to the archive's content.</returns>
+        private ArchiveReader getReaderFrom(Stream stream)
+        {
+            if (!(stream is MemoryStream memoryStream))
+            {
+                // This isn't used in any current path. May need to reconsider for performance reasons (ie. if we don't expect the incoming stream to be copied out).
+                byte[] buffer = new byte[stream.Length];
+                stream.Read(buffer, 0, (int)stream.Length);
+                memoryStream = new MemoryStream(buffer);
+            }
+
+            if (ZipUtils.IsZipArchive(memoryStream))
+                return new ZipArchiveReader(memoryStream, Path);
+
+            return new LegacyByteArrayReader(memoryStream.ToArray(), Path);
         }
 
         /// <summary>

osu.Game/Database/ModelDownloader.cs

@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 using Humanizer;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
+using osu.Game.Extensions;
 using osu.Game.Online.API;
 using osu.Game.Overlays.Notifications;
 
@@ -50,7 +51,7 @@ namespace osu.Game.Database
 
             DownloadNotification notification = new DownloadNotification
             {
-                Text = $"Downloading {request.Model}",
+                Text = $"Downloading {request.Model.GetDisplayString()}",
             };
 
             request.DownloadProgressed += progress =>

osu.Game/Database/OsuDbContext.cs

@@ -125,11 +125,11 @@ namespace osu.Game.Database
         {
             base.OnModelCreating(modelBuilder);
 
-            modelBuilder.Entity<BeatmapInfo>().HasIndex(b => b.OnlineBeatmapID).IsUnique();
+            modelBuilder.Entity<BeatmapInfo>().HasIndex(b => b.OnlineID).IsUnique();
             modelBuilder.Entity<BeatmapInfo>().HasIndex(b => b.MD5Hash);
             modelBuilder.Entity<BeatmapInfo>().HasIndex(b => b.Hash);
 
-            modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.OnlineBeatmapSetID).IsUnique();
+            modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.OnlineID).IsUnique();
             modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.DeletePending);
             modelBuilder.Entity<BeatmapSetInfo>().HasIndex(b => b.Hash).IsUnique();
 

osu.Game/Database/RealmContextFactory.cs

@@ -209,7 +209,13 @@ namespace osu.Game.Database
 
                 case 9:
                     // Pretty pointless to do this as beatmaps aren't really loaded via realm yet, but oh well.
-                    var oldMetadata = migration.OldRealm.DynamicApi.All(getMappedOrOriginalName(typeof(RealmBeatmapMetadata)));
+                    string metadataClassName = getMappedOrOriginalName(typeof(RealmBeatmapMetadata));
+
+                    // May be coming from a version before `RealmBeatmapMetadata` existed.
+                    if (!migration.OldRealm.Schema.TryFindObjectSchema(metadataClassName, out _))
+                        return;
+
+                    var oldMetadata = migration.OldRealm.DynamicApi.All(metadataClassName);
                     var newMetadata = migration.NewRealm.All<RealmBeatmapMetadata>();
 
                     int metadataCount = newMetadata.Count();

osu.Game/Extensions/ModelExtensions.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 osu.Game.Beatmaps;
+using osu.Game.Rulesets;
+using osu.Game.Scoring;
+using osu.Game.Users;
+
+namespace osu.Game.Extensions
+{
+    public static class ModelExtensions
+    {
+        /// <summary>
+        /// Returns a user-facing string representing the <paramref name="model"/>.
+        /// </summary>
+        /// <remarks>
+        /// <para>
+        /// Non-interface types without special handling will fall back to <see cref="object.ToString()"/>.
+        /// </para>
+        /// <para>
+        /// Warning: This method is _purposefully_ not called <c>GetDisplayTitle()</c> like the others, because otherwise
+        /// extension method type inference rules cause this method to call itself and cause a stack overflow.
+        /// </para>
+        /// </remarks>
+        public static string GetDisplayString(this object model)
+        {
+            string result = null;
+
+            switch (model)
+            {
+                case IBeatmapSetInfo beatmapSetInfo:
+                    result = beatmapSetInfo.Metadata?.GetDisplayTitle();
+                    break;
+
+                case IBeatmapInfo beatmapInfo:
+                    result = beatmapInfo.GetDisplayTitle();
+                    break;
+
+                case IBeatmapMetadataInfo metadataInfo:
+                    result = metadataInfo.GetDisplayTitle();
+                    break;
+
+                case IScoreInfo scoreInfo:
+                    result = scoreInfo.GetDisplayTitle();
+                    break;
+
+                case IRulesetInfo rulesetInfo:
+                    result = rulesetInfo.Name;
+                    break;
+
+                case IUser user:
+                    result = user.Username;
+                    break;
+            }
+
+            // fallback in case none of the above happens to match.
+            result ??= model?.ToString() ?? @"null";
+            return result;
+        }
+    }
+}

osu.Game/Graphics/OsuColour.cs

@@ -52,15 +52,18 @@ namespace osu.Game.Graphics
 
         public Color4 ForStarDifficulty(double starDifficulty) => ColourUtils.SampleFromLinearGradient(new[]
         {
-            (1.5f, Color4Extensions.FromHex("4fc0ff")),
+            (0.1f, Color4Extensions.FromHex("aaaaaa")),
+            (0.1f, Color4Extensions.FromHex("4290fb")),
+            (1.25f, Color4Extensions.FromHex("4fc0ff")),
             (2.0f, Color4Extensions.FromHex("4fffd5")),
             (2.5f, Color4Extensions.FromHex("7cff4f")),
-            (3.25f, Color4Extensions.FromHex("f6f05c")),
-            (4.5f, Color4Extensions.FromHex("ff8068")),
-            (6.0f, Color4Extensions.FromHex("ff3c71")),
-            (7.0f, Color4Extensions.FromHex("6563de")),
-            (8.0f, Color4Extensions.FromHex("18158e")),
-            (8.0f, Color4.Black),
+            (3.3f, Color4Extensions.FromHex("f6f05c")),
+            (4.2f, Color4Extensions.FromHex("ff8068")),
+            (4.9f, Color4Extensions.FromHex("ff4e6f")),
+            (5.8f, Color4Extensions.FromHex("c645b8")),
+            (6.7f, Color4Extensions.FromHex("6563de")),
+            (7.7f, Color4Extensions.FromHex("18158e")),
+            (9.0f, Color4.Black),
         }, (float)Math.Round(starDifficulty, 2, MidpointRounding.AwayFromZero));
 
         /// <summary>

osu.Game/IO/Archives/LegacyByteArrayReader.cs

@@ -7,7 +7,7 @@ using System.IO;
 namespace osu.Game.IO.Archives
 {
     /// <summary>
-    /// Allows reading a single file from the provided stream.
+    /// Allows reading a single file from the provided byte array.
     /// </summary>
     public class LegacyByteArrayReader : ArchiveReader
     {

osu.Game/Input/Bindings/GlobalActionContainer.cs

@@ -76,6 +76,7 @@ namespace osu.Game.Input.Bindings
             new KeyBinding(new[] { InputKey.J }, GlobalAction.EditorNudgeLeft),
             new KeyBinding(new[] { InputKey.K }, GlobalAction.EditorNudgeRight),
             new KeyBinding(new[] { InputKey.G }, GlobalAction.EditorCycleGridDisplayMode),
+            new KeyBinding(new[] { InputKey.F5 }, GlobalAction.EditorTestGameplay),
         };
 
         public IEnumerable<KeyBinding> InGameKeyBindings => new[]
@@ -288,6 +289,9 @@ namespace osu.Game.Input.Bindings
         ToggleChatFocus,
 
         [LocalisableDescription(typeof(GlobalActionKeyBindingStrings), nameof(GlobalActionKeyBindingStrings.EditorCycleGridDisplayMode))]
-        EditorCycleGridDisplayMode
+        EditorCycleGridDisplayMode,
+
+        [LocalisableDescription(typeof(GlobalActionKeyBindingStrings), nameof(GlobalActionKeyBindingStrings.EditorTestGameplay))]
+        EditorTestGameplay
     }
 }

osu.Game/Localisation/GlobalActionKeyBindingStrings.cs

@@ -169,6 +169,11 @@ namespace osu.Game.Localisation
         /// </summary>
         public static LocalisableString EditorCycleGridDisplayMode => new TranslatableString(getKey(@"editor_cycle_grid_display_mode"), @"Cycle grid display mode");
 
+        /// <summary>
+        /// "Test gameplay"
+        /// </summary>
+        public static LocalisableString EditorTestGameplay => new TranslatableString(getKey(@"editor_test_gameplay"), @"Test gameplay");
+
         /// <summary>
         /// "Hold for HUD"
         /// </summary>

osu.Game/Online/BeatmapDownloadTracker.cs

@@ -29,7 +29,7 @@ namespace osu.Game.Online
                 return;
 
             // Used to interact with manager classes that don't support interface types. Will eventually be replaced.
-            var beatmapSetInfo = new BeatmapSetInfo { OnlineBeatmapSetID = TrackedItem.OnlineID };
+            var beatmapSetInfo = new BeatmapSetInfo { OnlineID = TrackedItem.OnlineID };
 
             if (Manager.IsAvailableLocally(beatmapSetInfo))
                 UpdateState(DownloadState.LocallyAvailable);

osu.Game/Online/Chat/NowPlayingCommand.cs

@@ -57,7 +57,7 @@ namespace osu.Game.Online.Chat
                     break;
             }
 
-            string beatmapString = beatmapInfo.OnlineBeatmapID.HasValue ? $"[{api.WebsiteRootUrl}/b/{beatmapInfo.OnlineBeatmapID} {beatmapInfo}]" : beatmapInfo.ToString();
+            string beatmapString = beatmapInfo.OnlineID.HasValue ? $"[{api.WebsiteRootUrl}/b/{beatmapInfo.OnlineID} {beatmapInfo}]" : beatmapInfo.ToString();
 
             channelManager.PostMessage($"is {verb} {beatmapString}", true, target);
             Expire();

osu.Game/Online/HubClientConnector.cs

@@ -4,6 +4,7 @@
 #nullable enable
 
 using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.SignalR.Client;
@@ -161,9 +162,10 @@ namespace osu.Game.Online
                 builder.AddNewtonsoftJsonProtocol(options =>
                 {
                     options.PayloadSerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
-                    // TODO: This should only be required to be `TypeNameHandling.Auto`.
-                    // See usage in osu-server-spectator for further documentation as to why this is required.
-                    options.PayloadSerializerSettings.TypeNameHandling = TypeNameHandling.All;
+                    options.PayloadSerializerSettings.Converters = new List<JsonConverter>
+                    {
+                        new SignalRDerivedTypeWorkaroundJsonConverter(),
+                    };
                 });
             }
 

osu.Game/Online/Multiplayer/MatchRoomState.cs

@@ -16,7 +16,6 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVersusRoomState))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
-    // TODO: abstract breaks json serialisation. attention will be required for iOS support (unless we get messagepack AOT working instead).
     public abstract class MatchRoomState
     {
     }

osu.Game/Online/Multiplayer/MatchUserState.cs

@@ -16,7 +16,6 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVersusUserState))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
-    // TODO: abstract breaks json serialisation. attention will be required for iOS support (unless we get messagepack AOT working instead).
     public abstract class MatchUserState
     {
     }

osu.Game/Online/Multiplayer/MultiplayerClient.cs

@@ -229,7 +229,7 @@ namespace osu.Game.Online.Multiplayer
                 {
                     Value = new BeatmapInfo
                     {
-                        OnlineBeatmapID = Room.Settings.BeatmapID,
+                        OnlineID = Room.Settings.BeatmapID,
                         MD5Hash = Room.Settings.BeatmapChecksum
                     }
                 },

osu.Game/Online/Rooms/OnlinePlayBeatmapAvailabilityTracker.cs

@@ -113,7 +113,7 @@ namespace osu.Game.Online.Rooms
             int onlineId = SelectedItem.Value.Beatmap.Value.OnlineID;
             string checksum = SelectedItem.Value.Beatmap.Value.MD5Hash;
 
-            return beatmapManager.QueryBeatmap(b => b.OnlineBeatmapID == onlineId && b.MD5Hash == checksum && !b.BeatmapSet.DeletePending) != null;
+            return beatmapManager.QueryBeatmap(b => b.OnlineID == onlineId && b.MD5Hash == checksum && !b.BeatmapSet.DeletePending) != null;
         }
     }
 }