Merge pull request #10826 from smoogipoo/osu-hitobject-pooling-playfield

Change osu! ruleset to use pooled hitobjects

.gitignore

@@ -334,3 +334,5 @@ inspectcode
 
 # BenchmarkDotNet
 /BenchmarkDotNet.Artifacts
+
+*.GeneratedMSBuildEditorConfig.editorconfig

.idea/.idea.osu.Desktop/.idea/modules.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/.idea.osu.Desktop/riderModule.iml" filepath="$PROJECT_DIR$/.idea/.idea.osu.Desktop/riderModule.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/.idea.osu.Desktop/.idea/riderModule.iml" filepath="$PROJECT_DIR$/.idea/.idea.osu.Desktop/.idea/riderModule.iml" />
     </modules>
   </component>
 </project>

.vscode/tasks.json

@@ -11,9 +11,9 @@
                 "build",
                 "--no-restore",
                 "osu.Desktop",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -26,10 +26,10 @@
                 "build",
                 "--no-restore",
                 "osu.Desktop",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -42,9 +42,9 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Tests",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -57,10 +57,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Tests",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -73,9 +73,9 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Tournament.Tests",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -88,10 +88,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Tournament.Tests",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -104,10 +104,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Benchmarks",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"

CodeAnalysis/BannedSymbols.txt

@@ -4,5 +4,6 @@ M:System.ValueType.Equals(System.Object)~System.Boolean;Don't use object.Equals(
 M:System.Nullable`1.Equals(System.Object)~System.Boolean;Use == instead.
 T:System.IComparable;Don't use non-generic IComparable. Use generic version instead.
 M:osu.Framework.Graphics.Sprites.SpriteText.#ctor;Use OsuSpriteText.
+M:osu.Framework.Bindables.IBindableList`1.GetBoundCopy();Fails on iOS. Use manual ctor + BindTo instead. (see https://github.com/mono/mono/issues/19900)
 T:Microsoft.EntityFrameworkCore.Internal.EnumerableExtensions;Don't use internal extension methods.
 T:Microsoft.EntityFrameworkCore.Internal.TypeExtensions;Don't use internal extension methods.

Directory.Build.props

@@ -16,9 +16,9 @@
     <EmbeddedResource Include="Resources\**\*.*" />
   </ItemGroup>
   <ItemGroup Label="Code Analysis">
-    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.1" PrivateAssets="All" />
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)CodeAnalysis\BannedSymbols.txt" />
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.1" PrivateAssets="All" />
   </ItemGroup>
   <PropertyGroup Label="Code Analysis">
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)CodeAnalysis\osu.ruleset</CodeAnalysisRuleSet>

README.md

@@ -34,6 +34,8 @@ If you are looking to install or test osu! without setting up a development envi
 | [Windows (x64)](https://github.com/ppy/osu/releases/latest/download/install.exe)  | [macOS 10.12+](https://github.com/ppy/osu/releases/latest/download/osu.app.zip) | [Linux (x64)](https://github.com/ppy/osu/releases/latest/download/osu.AppImage) | [iOS(iOS 10+)](https://osu.ppy.sh/home/testflight) | [Android (5+)](https://github.com/ppy/osu/releases/latest/download/sh.ppy.osulazer.apk)
 | ------------- | ------------- | ------------- | ------------- | ------------- |
 
+- The iOS testflight link may fill up (Apple has a hard limit of 10,000 users). We reset it occasionally when this happens. Please do not ask about this. Check back regularly for link resets or follow [peppy](https://twitter.com/ppy) on twitter for announcements of link resets.
+
 - When running on Windows 7 or 8.1, **[additional prerequisites](https://docs.microsoft.com/en-us/dotnet/core/install/dependencies?tabs=netcore31&pivots=os-windows)** may be required to correctly run .NET Core applications if your operating system is not up-to-date with the latest service packs.
 
 If your platform is not listed above, there is still a chance you can manually build it by following the instructions below.

global.json

@@ -5,6 +5,6 @@
     "version": "3.1.100"
   },
   "msbuild-sdks": {
-    "Microsoft.Build.Traversal": "2.1.1"
+    "Microsoft.Build.Traversal": "2.2.3"
   }
 }

osu.Android.props

@@ -51,7 +51,7 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2020.904.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2020.1001.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2020.1030.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2020.1113.0" />
   </ItemGroup>
 </Project>

osu.Android/GameplayScreenRotationLocker.cs

@@ -0,0 +1,34 @@
+// 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 Android.Content.PM;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game;
+
+namespace osu.Android
+{
+    public class GameplayScreenRotationLocker : Component
+    {
+        private Bindable<bool> localUserPlaying;
+
+        [Resolved]
+        private OsuGameActivity gameActivity { get; set; }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuGame game)
+        {
+            localUserPlaying = game.LocalUserPlaying.GetBoundCopy();
+            localUserPlaying.BindValueChanged(updateLock, true);
+        }
+
+        private void updateLock(ValueChangedEvent<bool> userPlaying)
+        {
+            gameActivity.RunOnUiThread(() =>
+            {
+                gameActivity.RequestedOrientation = userPlaying.NewValue ? ScreenOrientation.Locked : ScreenOrientation.FullUser;
+            });
+        }
+    }
+}

osu.Android/OsuGameActivity.cs

@@ -9,10 +9,10 @@ using osu.Framework.Android;
 
 namespace osu.Android
 {
-    [Activity(Theme = "@android:style/Theme.NoTitleBar", MainLauncher = true, ScreenOrientation = ScreenOrientation.FullSensor, SupportsPictureInPicture = false, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize, HardwareAccelerated = false)]
+    [Activity(Theme = "@android:style/Theme.NoTitleBar", MainLauncher = true, ScreenOrientation = ScreenOrientation.FullUser, SupportsPictureInPicture = false, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize, HardwareAccelerated = false)]
     public class OsuGameActivity : AndroidGameActivity
     {
-        protected override Framework.Game CreateGame() => new OsuGameAndroid();
+        protected override Framework.Game CreateGame() => new OsuGameAndroid(this);
 
         protected override void OnCreate(Bundle savedInstanceState)
         {

osu.Android/OsuGameAndroid.cs

@@ -4,6 +4,7 @@
 using System;
 using Android.App;
 using Android.OS;
+using osu.Framework.Allocation;
 using osu.Game;
 using osu.Game.Updater;
 
@@ -11,6 +12,15 @@ namespace osu.Android
 {
     public class OsuGameAndroid : OsuGame
     {
+        [Cached]
+        private readonly OsuGameActivity gameActivity;
+
+        public OsuGameAndroid(OsuGameActivity activity)
+            : base(null)
+        {
+            gameActivity = activity;
+        }
+
         public override Version AssemblyVersion
         {
             get
@@ -55,6 +65,12 @@ namespace osu.Android
             }
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            LoadComponentAsync(new GameplayScreenRotationLocker(), Add);
+        }
+
         protected override UpdateManager CreateUpdateManager() => new SimpleUpdateManager();
     }
 }

osu.Android/osu.Android.csproj

@@ -21,6 +21,7 @@
     <AndroidLinkTool>r8</AndroidLinkTool>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="GameplayScreenRotationLocker.cs" />
     <Compile Include="OsuGameActivity.cs" />
     <Compile Include="OsuGameAndroid.cs" />
   </ItemGroup>
@@ -53,4 +54,4 @@
     <AndroidResource Include="Resources\drawable\lazer.png" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
-</Project>
+</Project>

osu.Desktop/DiscordRichPresence.cs

@@ -135,6 +135,9 @@ namespace osu.Desktop
 
                 case UserActivity.Editing edit:
                     return edit.Beatmap.ToString();
+
+                case UserActivity.InLobby lobby:
+                    return lobby.Room.Name.Value;
             }
 
             return string.Empty;

osu.Desktop/OsuGameDesktop.cs

@@ -125,12 +125,14 @@ namespace osu.Desktop
         {
             base.SetHost(host);
 
+            var iconStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(GetType(), "lazer.ico");
+
             switch (host.Window)
             {
                 // Legacy osuTK DesktopGameWindow
-                case DesktopGameWindow desktopGameWindow:
+                case OsuTKDesktopWindow desktopGameWindow:
                     desktopGameWindow.CursorState |= CursorState.Hidden;
-                    desktopGameWindow.SetIconFromStream(Assembly.GetExecutingAssembly().GetManifestResourceStream(GetType(), "lazer.ico"));
+                    desktopGameWindow.SetIconFromStream(iconStream);
                     desktopGameWindow.Title = Name;
                     desktopGameWindow.FileDrop += (_, e) => fileDrop(e.FileNames);
                     break;
@@ -138,6 +140,7 @@ namespace osu.Desktop
                 // SDL2 DesktopWindow
                 case DesktopWindow desktopWindow:
                     desktopWindow.CursorState.Value |= CursorState.Hidden;
+                    desktopWindow.SetIconFromStream(iconStream);
                     desktopWindow.Title = Name;
                     desktopWindow.DragDrop += f => fileDrop(new[] { f });
                     break;

osu.Desktop/Updater/SquirrelUpdateManager.cs

@@ -29,6 +29,11 @@ namespace osu.Desktop.Updater
 
         private static readonly Logger logger = Logger.GetLogger("updater");
 
+        /// <summary>
+        /// Whether an update has been downloaded but not yet applied.
+        /// </summary>
+        private bool updatePending;
+
         [BackgroundDependencyLoader]
         private void load(NotificationOverlay notification)
         {
@@ -37,9 +42,9 @@ namespace osu.Desktop.Updater
             Splat.Locator.CurrentMutable.Register(() => new SquirrelLogger(), typeof(Splat.ILogger));
         }
 
-        protected override async Task PerformUpdateCheck() => await checkForUpdateAsync();
+        protected override async Task<bool> PerformUpdateCheck() => await checkForUpdateAsync();
 
-        private async Task checkForUpdateAsync(bool useDeltaPatching = true, UpdateProgressNotification notification = null)
+        private async Task<bool> checkForUpdateAsync(bool useDeltaPatching = true, UpdateProgressNotification notification = null)
         {
             // should we schedule a retry on completion of this check?
             bool scheduleRecheck = true;
@@ -49,9 +54,19 @@ namespace osu.Desktop.Updater
                 updateManager ??= await UpdateManager.GitHubUpdateManager(@"https://github.com/ppy/osu", @"osulazer", null, null, true);
 
                 var info = await updateManager.CheckForUpdate(!useDeltaPatching);
+
                 if (info.ReleasesToApply.Count == 0)
+                {
+                    if (updatePending)
+                    {
+                        // the user may have dismissed the completion notice, so show it again.
+                        notificationOverlay.Post(new UpdateCompleteNotification(this));
+                        return true;
+                    }
+
                     // no updates available. bail and retry later.
-                    return;
+                    return false;
+                }
 
                 if (notification == null)
                 {
@@ -72,6 +87,7 @@ namespace osu.Desktop.Updater
                     await updateManager.ApplyReleases(info, p => notification.Progress = p / 100f);
 
                     notification.State = ProgressNotificationState.Completed;
+                    updatePending = true;
                 }
                 catch (Exception e)
                 {
@@ -103,6 +119,8 @@ namespace osu.Desktop.Updater
                     Scheduler.AddDelayed(async () => await checkForUpdateAsync(), 60000 * 30);
                 }
             }
+
+            return true;
         }
 
         protected override void Dispose(bool isDisposing)
@@ -111,10 +129,27 @@ namespace osu.Desktop.Updater
             updateManager?.Dispose();
         }
 
+        private class UpdateCompleteNotification : ProgressCompletionNotification
+        {
+            [Resolved]
+            private OsuGame game { get; set; }
+
+            public UpdateCompleteNotification(SquirrelUpdateManager updateManager)
+            {
+                Text = @"Update ready to install. Click to restart!";
+
+                Activated = () =>
+                {
+                    updateManager.PrepareUpdateAsync()
+                                 .ContinueWith(_ => updateManager.Schedule(() => game.GracefullyExit()));
+                    return true;
+                };
+            }
+        }
+
         private class UpdateProgressNotification : ProgressNotification
         {
             private readonly SquirrelUpdateManager updateManager;
-            private OsuGame game;
 
             public UpdateProgressNotification(SquirrelUpdateManager updateManager)
             {
@@ -123,23 +158,12 @@ namespace osu.Desktop.Updater
 
             protected override Notification CreateCompletionNotification()
             {
-                return new ProgressCompletionNotification
-                {
-                    Text = @"Update ready to install. Click to restart!",
-                    Activated = () =>
-                    {
-                        updateManager.PrepareUpdateAsync()
-                                     .ContinueWith(_ => updateManager.Schedule(() => game.GracefullyExit()));
-                        return true;
-                    }
-                };
+                return new UpdateCompleteNotification(updateManager);
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours, OsuGame game)
+            private void load(OsuColour colours)
             {
-                this.game = game;
-
                 IconContent.AddRange(new Drawable[]
                 {
                     new Box

osu.Desktop/Windows/GameplayWinKeyBlocker.cs

@@ -5,24 +5,24 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Platform;
+using osu.Game;
 using osu.Game.Configuration;
 
 namespace osu.Desktop.Windows
 {
     public class GameplayWinKeyBlocker : Component
     {
-        private Bindable<bool> allowScreenSuspension;
         private Bindable<bool> disableWinKey;
+        private Bindable<bool> localUserPlaying;
 
-        private GameHost host;
+        [Resolved]
+        private GameHost host { get; set; }
 
         [BackgroundDependencyLoader]
-        private void load(GameHost host, OsuConfigManager config)
+        private void load(OsuGame game, OsuConfigManager config)
         {
-            this.host = host;
-
-            allowScreenSuspension = host.AllowScreenSuspension.GetBoundCopy();
-            allowScreenSuspension.BindValueChanged(_ => updateBlocking());
+            localUserPlaying = game.LocalUserPlaying.GetBoundCopy();
+            localUserPlaying.BindValueChanged(_ => updateBlocking());
 
             disableWinKey = config.GetBindable<bool>(OsuSetting.GameplayDisableWinKey);
             disableWinKey.BindValueChanged(_ => updateBlocking(), true);
@@ -30,7 +30,7 @@ namespace osu.Desktop.Windows
 
         private void updateBlocking()
         {
-            bool shouldDisable = disableWinKey.Value && !allowScreenSuspension.Value;
+            bool shouldDisable = disableWinKey.Value && localUserPlaying.Value;
 
             if (shouldDisable)
                 host.InputThread.Scheduler.Add(WindowsKey.Disable);

osu.Game.Rulesets.Catch.Tests/.vscode/tasks.json

@@ -11,9 +11,9 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Catch.Tests.csproj",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -26,10 +26,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Catch.Tests.csproj",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"

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

@@ -123,7 +123,10 @@ namespace osu.Game.Rulesets.Catch.Tests
                     Origin = Anchor.Centre,
                     Scale = new Vector2(4f),
                 }, skin);
+            });
 
+            AddStep("get trails container", () =>
+            {
                 trails = catcherArea.OfType<CatcherTrailDisplay>().Single();
                 catcherArea.MovableCatcher.SetHyperDashState(2);
             });

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -141,11 +141,40 @@ namespace osu.Game.Rulesets.Catch
 
         public override Drawable CreateIcon() => new SpriteIcon { Icon = OsuIcon.RulesetCatch };
 
+        protected override IEnumerable<HitResult> GetValidHitResults()
+        {
+            return new[]
+            {
+                HitResult.Great,
+
+                HitResult.LargeTickHit,
+                HitResult.SmallTickHit,
+                HitResult.LargeBonus,
+            };
+        }
+
+        public override string GetDisplayNameForHitResult(HitResult result)
+        {
+            switch (result)
+            {
+                case HitResult.LargeTickHit:
+                    return "large droplet";
+
+                case HitResult.SmallTickHit:
+                    return "small droplet";
+
+                case HitResult.LargeBonus:
+                    return "banana";
+            }
+
+            return base.GetDisplayNameForHitResult(result);
+        }
+
         public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(this, beatmap);
 
         public override ISkin CreateLegacySkinProvider(ISkinSource source, IBeatmap beatmap) => new CatchLegacySkinTransformer(source);
 
-        public override PerformanceCalculator CreatePerformanceCalculator(WorkingBeatmap beatmap, ScoreInfo score) => new CatchPerformanceCalculator(this, beatmap, score);
+        public override PerformanceCalculator CreatePerformanceCalculator(DifficultyAttributes attributes, ScoreInfo score) => new CatchPerformanceCalculator(this, attributes, score);
 
         public int LegacyID => 2;
 

osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceCalculator.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Extensions;
-using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Scoring;
@@ -25,8 +24,8 @@ namespace osu.Game.Rulesets.Catch.Difficulty
         private int tinyTicksMissed;
         private int misses;
 
-        public CatchPerformanceCalculator(Ruleset ruleset, WorkingBeatmap beatmap, ScoreInfo score)
-            : base(ruleset, beatmap, score)
+        public CatchPerformanceCalculator(Ruleset ruleset, DifficultyAttributes attributes, ScoreInfo score)
+            : base(ruleset, attributes, score)
         {
         }
 

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

@@ -17,9 +17,11 @@ namespace osu.Game.Rulesets.Catch.Mods
         private const double fade_out_offset_multiplier = 0.6;
         private const double fade_out_duration_multiplier = 0.44;
 
-        protected override void ApplyHiddenState(DrawableHitObject drawable, ArmedState state)
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state)
         {
-            if (!(drawable is DrawableCatchHitObject catchDrawable))
+            base.ApplyNormalVisibilityState(hitObject, state);
+
+            if (!(hitObject is DrawableCatchHitObject catchDrawable))
                 return;
 
             if (catchDrawable.NestedHitObjects.Any())

osu.Game.Rulesets.Catch/Objects/Drawables/DrawableCatchHitObject.cs

@@ -6,9 +6,8 @@ using System.Collections.Generic;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Game.Rulesets.Objects;
-using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects.Drawables;
 using osuTK;
 using osuTK.Graphics;
 
@@ -62,6 +61,8 @@ namespace osu.Game.Rulesets.Catch.Objects.Drawables
 
     public abstract class DrawableCatchHitObject : DrawableHitObject<CatchHitObject>
     {
+        protected override double InitialLifetimeOffset => HitObject.TimePreempt;
+
         public virtual bool StaysOnPlate => HitObject.CanBePlated;
 
         public float DisplayRadius => DrawSize.X / 2 * Scale.X * HitObject.Scale;
@@ -88,22 +89,17 @@ namespace osu.Game.Rulesets.Catch.Objects.Drawables
                 ApplyResult(r => r.Type = CheckPosition.Invoke(HitObject) ? r.Judgement.MaxResult : r.Judgement.MinResult);
         }
 
-        protected override void UpdateStateTransforms(ArmedState state)
+        protected override void UpdateHitStateTransforms(ArmedState state)
         {
-            var endTime = HitObject.GetEndTime();
-
-            using (BeginAbsoluteSequence(endTime, true))
+            switch (state)
             {
-                switch (state)
-                {
-                    case ArmedState.Miss:
-                        this.FadeOut(250).RotateTo(Rotation * 2, 250, Easing.Out);
-                        break;
+                case ArmedState.Miss:
+                    this.FadeOut(250).RotateTo(Rotation * 2, 250, Easing.Out);
+                    break;
 
-                    case ArmedState.Hit:
-                        this.FadeOut();
-                        break;
-                }
+                case ArmedState.Hit:
+                    this.FadeOut();
+                    break;
             }
         }
     }

osu.Game.Rulesets.Catch/Objects/JuiceStream.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
@@ -56,6 +57,7 @@ namespace osu.Game.Rulesets.Catch.Objects
                 Volume = s.Volume
             }).ToList();
 
+            int nodeIndex = 0;
             SliderEventDescriptor? lastEvent = null;
 
             foreach (var e in SliderEventGenerator.Generate(StartTime, SpanDuration, Velocity, TickDistance, Path.Distance, this.SpanCount(), LegacyLastTickOffset, cancellationToken))
@@ -105,7 +107,7 @@ namespace osu.Game.Rulesets.Catch.Objects
                     case SliderEventType.Repeat:
                         AddNested(new Fruit
                         {
-                            Samples = Samples,
+                            Samples = this.GetNodeSamples(nodeIndex++),
                             StartTime = e.Time,
                             X = X + Path.PositionAt(e.PathProgress).X,
                         });
@@ -119,7 +121,7 @@ namespace osu.Game.Rulesets.Catch.Objects
         public double Duration
         {
             get => this.SpanCount() * Path.Distance / Velocity;
-            set => throw new System.NotSupportedException($"Adjust via {nameof(RepeatCount)} instead"); // can be implemented if/when needed.
+            set => throw new NotSupportedException($"Adjust via {nameof(RepeatCount)} instead"); // can be implemented if/when needed.
         }
 
         public double EndTime => StartTime + Duration;

osu.Game.Rulesets.Catch/Replays/CatchReplayFrame.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Rulesets.Catch.Replays
                 if (Position > lastCatchFrame.Position)
                     lastCatchFrame.Actions.Add(CatchAction.MoveRight);
                 else if (Position < lastCatchFrame.Position)
-                    Actions.Add(CatchAction.MoveLeft);
+                    lastCatchFrame.Actions.Add(CatchAction.MoveLeft);
             }
         }
 

osu.Game.Rulesets.Catch/Skinning/CatchLegacySkinTransformer.cs

@@ -13,6 +13,11 @@ namespace osu.Game.Rulesets.Catch.Skinning
 {
     public class CatchLegacySkinTransformer : LegacySkinTransformer
     {
+        /// <summary>
+        /// For simplicity, let's use legacy combo font texture existence as a way to identify legacy skins from default.
+        /// </summary>
+        private bool providesComboCounter => this.HasFont(GetConfig<LegacySetting, string>(LegacySetting.ComboPrefix)?.Value ?? "score");
+
         public CatchLegacySkinTransformer(ISkinSource source)
             : base(source)
         {
@@ -20,6 +25,16 @@ namespace osu.Game.Rulesets.Catch.Skinning
 
         public override Drawable GetDrawableComponent(ISkinComponent component)
         {
+            if (component is HUDSkinComponent hudComponent)
+            {
+                switch (hudComponent.Component)
+                {
+                    case HUDSkinComponents.ComboCounter:
+                        // catch may provide its own combo counter; hide the default.
+                        return providesComboCounter ? Drawable.Empty() : null;
+                }
+            }
+
             if (!(component is CatchSkinComponent catchSkinComponent))
                 return null;
 
@@ -55,11 +70,9 @@ namespace osu.Game.Rulesets.Catch.Skinning
                            this.GetAnimation("fruit-ryuuta", true, true, true);
 
                 case CatchSkinComponents.CatchComboCounter:
-                    var comboFont = GetConfig<LegacySetting, string>(LegacySetting.ComboPrefix)?.Value ?? "score";
 
-                    // For simplicity, let's use legacy combo font texture existence as a way to identify legacy skins from default.
-                    if (this.HasFont(comboFont))
-                        return new LegacyComboCounter(Source);
+                    if (providesComboCounter)
+                        return new LegacyCatchComboCounter(Source);
 
                     break;
             }

osu.Game.Rulesets.Catch/Skinning/LegacyCatchComboCounter.cs

@@ -14,13 +14,13 @@ namespace osu.Game.Rulesets.Catch.Skinning
     /// <summary>
     /// A combo counter implementation that visually behaves almost similar to stable's osu!catch combo counter.
     /// </summary>
-    public class LegacyComboCounter : CompositeDrawable, ICatchComboCounter
+    public class LegacyCatchComboCounter : CompositeDrawable, ICatchComboCounter
     {
         private readonly LegacyRollingCounter counter;
 
         private readonly LegacyRollingCounter explosion;
 
-        public LegacyComboCounter(ISkin skin)
+        public LegacyCatchComboCounter(ISkin skin)
         {
             var fontName = skin.GetConfig<LegacySetting, string>(LegacySetting.ComboPrefix)?.Value ?? "score";
             var fontOverlap = skin.GetConfig<LegacySetting, float>(LegacySetting.ComboOverlap)?.Value ?? -2f;

osu.Game.Rulesets.Catch/UI/CatchComboDisplay.cs

@@ -36,7 +36,7 @@ namespace osu.Game.Rulesets.Catch.UI
             if (!result.Type.AffectsCombo() || !result.HasResult)
                 return;
 
-            if (result.Type == HitResult.Miss)
+            if (!result.IsHit)
             {
                 updateCombo(0, null);
                 return;

osu.Game.Rulesets.Catch/UI/Catcher.cs

@@ -145,11 +145,19 @@ namespace osu.Game.Rulesets.Catch.UI
                 }
             };
 
-            trailsTarget.Add(trails = new CatcherTrailDisplay(this));
+            trails = new CatcherTrailDisplay(this);
 
             updateCatcher();
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            // don't add in above load as we may potentially modify a parent in an unsafe manner.
+            trailsTarget.Add(trails);
+        }
+
         /// <summary>
         /// Creates proxied content to be displayed beneath hitobjects.
         /// </summary>

osu.Game.Rulesets.Mania.Tests/.vscode/tasks.json

@@ -11,9 +11,9 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Mania.Tests.csproj",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -26,10 +26,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Mania.Tests.csproj",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"

osu.Game.Rulesets.Mania.Tests/ManiaBeatmapConversionTest.cs

@@ -83,11 +83,17 @@ namespace osu.Game.Rulesets.Mania.Tests
             RandomZ = snapshot.RandomZ;
         }
 
+        public override void PostProcess()
+        {
+            base.PostProcess();
+            Objects.Sort();
+        }
+
         public bool Equals(ManiaConvertMapping other) => other != null && RandomW == other.RandomW && RandomX == other.RandomX && RandomY == other.RandomY && RandomZ == other.RandomZ;
         public override bool Equals(ConvertMapping<ConvertValue> other) => base.Equals(other) && Equals(other as ManiaConvertMapping);
     }
 
-    public struct ConvertValue : IEquatable<ConvertValue>
+    public struct ConvertValue : IEquatable<ConvertValue>, IComparable<ConvertValue>
     {
         /// <summary>
         /// A sane value to account for osu!stable using ints everwhere.
@@ -102,5 +108,15 @@ namespace osu.Game.Rulesets.Mania.Tests
             => Precision.AlmostEquals(StartTime, other.StartTime, conversion_lenience)
                && Precision.AlmostEquals(EndTime, other.EndTime, conversion_lenience)
                && Column == other.Column;
+
+        public int CompareTo(ConvertValue other)
+        {
+            var result = StartTime.CompareTo(other.StartTime);
+
+            if (result != 0)
+                return result;
+
+            return Column.CompareTo(other.Column);
+        }
     }
 }

osu.Game.Rulesets.Mania.Tests/ManiaDifficultyCalculatorTest.cs

@@ -13,7 +13,7 @@ namespace osu.Game.Rulesets.Mania.Tests
     {
         protected override string ResourceAssembly => "osu.Game.Rulesets.Mania";
 
-        [TestCase(2.3683365342338796d, "diffcalc-test")]
+        [TestCase(2.3449735700206298d, "diffcalc-test")]
         public void Test(double expected, string name)
             => base.Test(expected, name);
 

osu.Game.Rulesets.Mania.Tests/Skinning/TestSceneHoldNote.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Linq;
+using NUnit.Framework;
 using osu.Framework.Bindables;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
@@ -13,7 +14,8 @@ namespace osu.Game.Rulesets.Mania.Tests.Skinning
 {
     public class TestSceneHoldNote : ManiaHitObjectTestScene
     {
-        public TestSceneHoldNote()
+        [Test]
+        public void TestHoldNote()
         {
             AddToggleStep("toggle hitting", v =>
             {

osu.Game.Rulesets.Mania.Tests/TestSceneNotes.cs

@@ -28,25 +28,33 @@ namespace osu.Game.Rulesets.Mania.Tests
     [TestFixture]
     public class TestSceneNotes : OsuTestScene
     {
-        [BackgroundDependencyLoader]
-        private void load()
+        [Test]
+        public void TestVariousNotes()
         {
-            Child = new FillFlowContainer
+            DrawableNote note1 = null;
+            DrawableNote note2 = null;
+            DrawableHoldNote holdNote1 = null;
+            DrawableHoldNote holdNote2 = null;
+
+            AddStep("create notes", () =>
             {
-                Clock = new FramedClock(new ManualClock()),
-                Anchor = Anchor.Centre,
-                Origin = Anchor.Centre,
-                AutoSizeAxes = Axes.Both,
-                Direction = FillDirection.Horizontal,
-                Spacing = new Vector2(20),
-                Children = new[]
+                Child = new FillFlowContainer
                 {
-                    createNoteDisplay(ScrollingDirection.Down, 1, out var note1),
-                    createNoteDisplay(ScrollingDirection.Up, 2, out var note2),
-                    createHoldNoteDisplay(ScrollingDirection.Down, 1, out var holdNote1),
-                    createHoldNoteDisplay(ScrollingDirection.Up, 2, out var holdNote2),
-                }
-            };
+                    Clock = new FramedClock(new ManualClock()),
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    AutoSizeAxes = Axes.Both,
+                    Direction = FillDirection.Horizontal,
+                    Spacing = new Vector2(20),
+                    Children = new[]
+                    {
+                        createNoteDisplay(ScrollingDirection.Down, 1, out note1),
+                        createNoteDisplay(ScrollingDirection.Up, 2, out note2),
+                        createHoldNoteDisplay(ScrollingDirection.Down, 1, out holdNote1),
+                        createHoldNoteDisplay(ScrollingDirection.Up, 2, out holdNote2),
+                    }
+                };
+            });
 
             AddAssert("note 1 facing downwards", () => verifyAnchors(note1, Anchor.y2));
             AddAssert("note 2 facing upwards", () => verifyAnchors(note2, Anchor.y0));

osu.Game.Rulesets.Mania.Tests/TestSceneOutOfOrderHits.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
@@ -35,6 +36,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
                 objects.Add(new Note { StartTime = time });
 
+                // don't hit the first note
                 if (i > 0)
                 {
                     frames.Add(new ManiaReplayFrame(time + 10, ManiaAction.Key1));
@@ -53,12 +55,77 @@ namespace osu.Game.Rulesets.Mania.Tests
             }
         }
 
+        [Test]
+        public void TestHoldNoteMissAfterNextObjectStartTime()
+        {
+            var objects = new List<ManiaHitObject>
+            {
+                new HoldNote
+                {
+                    StartTime = 1000,
+                    EndTime = 1010,
+                },
+                new HoldNote
+                {
+                    StartTime = 1020,
+                    EndTime = 1030
+                }
+            };
+
+            performTest(objects, new List<ReplayFrame>());
+
+            addJudgementAssert(objects[0], HitResult.IgnoreHit);
+            addJudgementAssert(objects[1], HitResult.IgnoreHit);
+        }
+
+        [Test]
+        public void TestHoldNoteReleasedHitAfterNextObjectStartTime()
+        {
+            var objects = new List<ManiaHitObject>
+            {
+                new HoldNote
+                {
+                    StartTime = 1000,
+                    EndTime = 1010,
+                },
+                new HoldNote
+                {
+                    StartTime = 1020,
+                    EndTime = 1030
+                }
+            };
+
+            var frames = new List<ReplayFrame>
+            {
+                new ManiaReplayFrame(1000, ManiaAction.Key1),
+                new ManiaReplayFrame(1030),
+                new ManiaReplayFrame(1040, ManiaAction.Key1),
+                new ManiaReplayFrame(1050)
+            };
+
+            performTest(objects, frames);
+
+            addJudgementAssert(objects[0], HitResult.IgnoreHit);
+            addJudgementAssert("first head", () => ((HoldNote)objects[0]).Head, HitResult.Perfect);
+            addJudgementAssert("first tail", () => ((HoldNote)objects[0]).Tail, HitResult.Perfect);
+
+            addJudgementAssert(objects[1], HitResult.IgnoreHit);
+            addJudgementAssert("second head", () => ((HoldNote)objects[1]).Head, HitResult.Great);
+            addJudgementAssert("second tail", () => ((HoldNote)objects[1]).Tail, HitResult.Perfect);
+        }
+
         private void addJudgementAssert(ManiaHitObject hitObject, HitResult result)
         {
             AddAssert($"({hitObject.GetType().ReadableName()} @ {hitObject.StartTime}) judgement is {result}",
                 () => judgementResults.Single(r => r.HitObject == hitObject).Type == result);
         }
 
+        private void addJudgementAssert(string name, Func<ManiaHitObject> hitObject, HitResult result)
+        {
+            AddAssert($"{name} judgement is {result}",
+                () => judgementResults.Single(r => r.HitObject == hitObject()).Type == result);
+        }
+
         private void addJudgementOffsetAssert(ManiaHitObject hitObject, double offset)
         {
             AddAssert($"({hitObject.GetType().ReadableName()} @ {hitObject.StartTime}) judged at {offset}",

osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmap.cs

@@ -21,13 +21,20 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// </summary>
         public int TotalColumns => Stages.Sum(g => g.Columns);
 
+        /// <summary>
+        /// The total number of columns that were present in this <see cref="ManiaBeatmap"/> before any user adjustments.
+        /// </summary>
+        public readonly int OriginalTotalColumns;
+
         /// <summary>
         /// Creates a new <see cref="ManiaBeatmap"/>.
         /// </summary>
         /// <param name="defaultStage">The initial stages.</param>
-        public ManiaBeatmap(StageDefinition defaultStage)
+        /// <param name="originalTotalColumns">The total number of columns present before any user adjustments. Defaults to the total columns in <paramref name="defaultStage"/>.</param>
+        public ManiaBeatmap(StageDefinition defaultStage, int? originalTotalColumns = null)
         {
             Stages.Add(defaultStage);
+            OriginalTotalColumns = originalTotalColumns ?? defaultStage.Columns;
         }
 
         public override IEnumerable<BeatmapStatistic> GetStatistics()

osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs

@@ -28,6 +28,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         public bool Dual;
         public readonly bool IsForCurrentRuleset;
 
+        private readonly int originalTargetColumns;
+
         // Internal for testing purposes
         internal FastRandom Random { get; private set; }
 
@@ -65,6 +67,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
                 else
                     TargetColumns = Math.Max(4, Math.Min((int)roundedOverallDifficulty + 1, 7));
             }
+
+            originalTargetColumns = TargetColumns;
         }
 
         public override bool CanConvert() => Beatmap.HitObjects.All(h => h is IHasXPosition);
@@ -81,7 +85,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
 
         protected override Beatmap<ManiaHitObject> CreateBeatmap()
         {
-            beatmap = new ManiaBeatmap(new StageDefinition { Columns = TargetColumns });
+            beatmap = new ManiaBeatmap(new StageDefinition { Columns = TargetColumns }, originalTargetColumns);
 
             if (Dual)
                 beatmap.Stages.Add(new StageDefinition { Columns = TargetColumns });
@@ -116,7 +120,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
                 prevNoteTimes.RemoveAt(0);
             prevNoteTimes.Add(newNoteTime);
 
-            density = (prevNoteTimes[^1] - prevNoteTimes[0]) / prevNoteTimes.Count;
+            if (prevNoteTimes.Count >= 2)
+                density = (prevNoteTimes[^1] - prevNoteTimes[0]) / prevNoteTimes.Count;
         }
 
         private double lastTime;
@@ -180,7 +185,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
 
                 case IHasDuration endTimeData:
                 {
-                    conversion = new EndTimeObjectPatternGenerator(Random, original, beatmap, originalBeatmap);
+                    conversion = new EndTimeObjectPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
 
                     recordNote(endTimeData.EndTime, new Vector2(256, 192));
                     computeDensity(endTimeData.EndTime);

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/DistanceObjectPatternGenerator.cs

@@ -3,8 +3,8 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
-using osu.Framework.Utils;
 using osu.Game.Audio;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mania.MathUtils;
@@ -12,6 +12,7 @@ using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Mania.Objects;
 using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Beatmaps.Formats;
 
 namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 {
@@ -25,8 +26,9 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         private const float osu_base_scoring_distance = 100;
 
-        public readonly double EndTime;
-        public readonly double SegmentDuration;
+        public readonly int StartTime;
+        public readonly int EndTime;
+        public readonly int SegmentDuration;
         public readonly int SpanCount;
 
         private PatternType convertType;
@@ -41,20 +43,26 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
             var distanceData = hitObject as IHasDistance;
             var repeatsData = hitObject as IHasRepeats;
 
-            SpanCount = repeatsData?.SpanCount() ?? 1;
+            Debug.Assert(distanceData != null);
 
             TimingControlPoint timingPoint = beatmap.ControlPointInfo.TimingPointAt(hitObject.StartTime);
             DifficultyControlPoint difficultyPoint = beatmap.ControlPointInfo.DifficultyPointAt(hitObject.StartTime);
 
-            // The true distance, accounting for any repeats
-            double distance = (distanceData?.Distance ?? 0) * SpanCount;
-            // The velocity of the osu! hit object - calculated as the velocity of a slider
-            double osuVelocity = osu_base_scoring_distance * beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier * difficultyPoint.SpeedMultiplier / timingPoint.BeatLength;
-            // The duration of the osu! hit object
-            double osuDuration = distance / osuVelocity;
+            double beatLength;
+#pragma warning disable 618
+            if (difficultyPoint is LegacyBeatmapDecoder.LegacyDifficultyControlPoint legacyDifficultyPoint)
+#pragma warning restore 618
+                beatLength = timingPoint.BeatLength * legacyDifficultyPoint.BpmMultiplier;
+            else
+                beatLength = timingPoint.BeatLength / difficultyPoint.SpeedMultiplier;
 
-            EndTime = hitObject.StartTime + osuDuration;
-            SegmentDuration = (EndTime - HitObject.StartTime) / SpanCount;
+            SpanCount = repeatsData?.SpanCount() ?? 1;
+            StartTime = (int)Math.Round(hitObject.StartTime);
+
+            // This matches stable's calculation.
+            EndTime = (int)Math.Floor(StartTime + distanceData.Distance * beatLength * SpanCount * 0.01 / beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier);
+
+            SegmentDuration = (EndTime - StartTime) / SpanCount;
         }
 
         public override IEnumerable<Pattern> Generate()
@@ -76,7 +84,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
             foreach (var obj in originalPattern.HitObjects)
             {
-                if (!Precision.AlmostEquals(EndTime, obj.GetEndTime()))
+                if (EndTime != (int)Math.Round(obj.GetEndTime()))
                     intermediatePattern.Add(obj);
                 else
                     endTimePattern.Add(obj);
@@ -91,35 +99,35 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
             if (TotalColumns == 1)
             {
                 var pattern = new Pattern();
-                addToPattern(pattern, 0, HitObject.StartTime, EndTime);
+                addToPattern(pattern, 0, StartTime, EndTime);
                 return pattern;
             }
 
             if (SpanCount > 1)
             {
                 if (SegmentDuration <= 90)
-                    return generateRandomHoldNotes(HitObject.StartTime, 1);
+                    return generateRandomHoldNotes(StartTime, 1);
 
                 if (SegmentDuration <= 120)
                 {
                     convertType |= PatternType.ForceNotStack;
-                    return generateRandomNotes(HitObject.StartTime, SpanCount + 1);
+                    return generateRandomNotes(StartTime, SpanCount + 1);
                 }
 
                 if (SegmentDuration <= 160)
-                    return generateStair(HitObject.StartTime);
+                    return generateStair(StartTime);
 
                 if (SegmentDuration <= 200 && ConversionDifficulty > 3)
-                    return generateRandomMultipleNotes(HitObject.StartTime);
+                    return generateRandomMultipleNotes(StartTime);
 
-                double duration = EndTime - HitObject.StartTime;
+                double duration = EndTime - StartTime;
                 if (duration >= 4000)
-                    return generateNRandomNotes(HitObject.StartTime, 0.23, 0, 0);
+                    return generateNRandomNotes(StartTime, 0.23, 0, 0);
 
                 if (SegmentDuration > 400 && SpanCount < TotalColumns - 1 - RandomStart)
-                    return generateTiledHoldNotes(HitObject.StartTime);
+                    return generateTiledHoldNotes(StartTime);
 
-                return generateHoldAndNormalNotes(HitObject.StartTime);
+                return generateHoldAndNormalNotes(StartTime);
             }
 
             if (SegmentDuration <= 110)
@@ -128,37 +136,37 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     convertType |= PatternType.ForceNotStack;
                 else
                     convertType &= ~PatternType.ForceNotStack;
-                return generateRandomNotes(HitObject.StartTime, SegmentDuration < 80 ? 1 : 2);
+                return generateRandomNotes(StartTime, SegmentDuration < 80 ? 1 : 2);
             }
 
             if (ConversionDifficulty > 6.5)
             {
                 if (convertType.HasFlag(PatternType.LowProbability))
-                    return generateNRandomNotes(HitObject.StartTime, 0.78, 0.3, 0);
+                    return generateNRandomNotes(StartTime, 0.78, 0.3, 0);
 
-                return generateNRandomNotes(HitObject.StartTime, 0.85, 0.36, 0.03);
+                return generateNRandomNotes(StartTime, 0.85, 0.36, 0.03);
             }
 
             if (ConversionDifficulty > 4)
             {
                 if (convertType.HasFlag(PatternType.LowProbability))
-                    return generateNRandomNotes(HitObject.StartTime, 0.43, 0.08, 0);
+                    return generateNRandomNotes(StartTime, 0.43, 0.08, 0);
 
-                return generateNRandomNotes(HitObject.StartTime, 0.56, 0.18, 0);
+                return generateNRandomNotes(StartTime, 0.56, 0.18, 0);
             }
 
             if (ConversionDifficulty > 2.5)
             {
                 if (convertType.HasFlag(PatternType.LowProbability))
-                    return generateNRandomNotes(HitObject.StartTime, 0.3, 0, 0);
+                    return generateNRandomNotes(StartTime, 0.3, 0, 0);
 
-                return generateNRandomNotes(HitObject.StartTime, 0.37, 0.08, 0);
+                return generateNRandomNotes(StartTime, 0.37, 0.08, 0);
             }
 
             if (convertType.HasFlag(PatternType.LowProbability))
-                return generateNRandomNotes(HitObject.StartTime, 0.17, 0, 0);
+                return generateNRandomNotes(StartTime, 0.17, 0, 0);
 
-            return generateNRandomNotes(HitObject.StartTime, 0.27, 0, 0);
+            return generateNRandomNotes(StartTime, 0.27, 0, 0);
         }
 
         /// <summary>
@@ -167,7 +175,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// <param name="startTime">Start time of each hold note.</param>
         /// <param name="noteCount">Number of hold notes.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateRandomHoldNotes(double startTime, int noteCount)
+        private Pattern generateRandomHoldNotes(int startTime, int noteCount)
         {
             // - - - -
             // ■ - ■ ■
@@ -202,7 +210,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// <param name="startTime">The start time.</param>
         /// <param name="noteCount">The number of notes.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateRandomNotes(double startTime, int noteCount)
+        private Pattern generateRandomNotes(int startTime, int noteCount)
         {
             // - - - -
             // x - - -
@@ -234,7 +242,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         /// <param name="startTime">The start time.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateStair(double startTime)
+        private Pattern generateStair(int startTime)
         {
             // - - - -
             // x - - -
@@ -286,7 +294,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         /// <param name="startTime">The start time.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateRandomMultipleNotes(double startTime)
+        private Pattern generateRandomMultipleNotes(int startTime)
         {
             // - - - -
             // x - - -
@@ -329,7 +337,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// <param name="p3">The probability required for 3 hold notes to be generated.</param>
         /// <param name="p4">The probability required for 4 hold notes to be generated.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateNRandomNotes(double startTime, double p2, double p3, double p4)
+        private Pattern generateNRandomNotes(int startTime, double p2, double p3, double p4)
         {
             // - - - -
             // ■ - ■ ■
@@ -366,7 +374,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
             static bool isDoubleSample(HitSampleInfo sample) => sample.Name == HitSampleInfo.HIT_CLAP || sample.Name == HitSampleInfo.HIT_FINISH;
 
             bool canGenerateTwoNotes = !convertType.HasFlag(PatternType.LowProbability);
-            canGenerateTwoNotes &= HitObject.Samples.Any(isDoubleSample) || sampleInfoListAt(HitObject.StartTime).Any(isDoubleSample);
+            canGenerateTwoNotes &= HitObject.Samples.Any(isDoubleSample) || sampleInfoListAt(StartTime).Any(isDoubleSample);
 
             if (canGenerateTwoNotes)
                 p2 = 1;
@@ -379,7 +387,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         /// <param name="startTime">The first hold note start time.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateTiledHoldNotes(double startTime)
+        private Pattern generateTiledHoldNotes(int startTime)
         {
             // - - - -
             // ■ ■ ■ ■
@@ -394,6 +402,9 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
             int columnRepeat = Math.Min(SpanCount, TotalColumns);
 
+            // Due to integer rounding, this is not guaranteed to be the same as EndTime (the class-level variable).
+            int endTime = startTime + SegmentDuration * SpanCount;
+
             int nextColumn = GetColumn((HitObject as IHasXPosition)?.X ?? 0, true);
             if (convertType.HasFlag(PatternType.ForceNotStack) && PreviousPattern.ColumnWithObjects < TotalColumns)
                 nextColumn = FindAvailableColumn(nextColumn, PreviousPattern);
@@ -401,7 +412,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
             for (int i = 0; i < columnRepeat; i++)
             {
                 nextColumn = FindAvailableColumn(nextColumn, pattern);
-                addToPattern(pattern, nextColumn, startTime, EndTime);
+                addToPattern(pattern, nextColumn, startTime, endTime);
                 startTime += SegmentDuration;
             }
 
@@ -413,7 +424,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         /// <param name="startTime">The start time of notes.</param>
         /// <returns>The <see cref="Pattern"/> containing the hit objects.</returns>
-        private Pattern generateHoldAndNormalNotes(double startTime)
+        private Pattern generateHoldAndNormalNotes(int startTime)
         {
             // - - - -
             // ■ x x -
@@ -448,7 +459,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
             for (int i = 0; i <= SpanCount; i++)
             {
-                if (!(ignoreHead && startTime == HitObject.StartTime))
+                if (!(ignoreHead && startTime == StartTime))
                 {
                     for (int j = 0; j < noteCount; j++)
                     {
@@ -471,19 +482,18 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         /// <param name="time">The time to retrieve the sample info list from.</param>
         /// <returns></returns>
-        private IList<HitSampleInfo> sampleInfoListAt(double time) => nodeSamplesAt(time)?.First() ?? HitObject.Samples;
+        private IList<HitSampleInfo> sampleInfoListAt(int time) => nodeSamplesAt(time)?.First() ?? HitObject.Samples;
 
         /// <summary>
         /// Retrieves the list of node samples that occur at time greater than or equal to <paramref name="time"/>.
         /// </summary>
         /// <param name="time">The time to retrieve node samples at.</param>
-        private List<IList<HitSampleInfo>> nodeSamplesAt(double time)
+        private List<IList<HitSampleInfo>> nodeSamplesAt(int time)
         {
             if (!(HitObject is IHasPathWithRepeats curveData))
                 return null;
 
-            // mathematically speaking this should be a whole number always, but floating-point arithmetic is not so kind
-            var index = (int)Math.Round(SegmentDuration == 0 ? 0 : (time - HitObject.StartTime) / SegmentDuration, MidpointRounding.AwayFromZero);
+            var index = SegmentDuration == 0 ? 0 : (time - StartTime) / SegmentDuration;
 
             // avoid slicing the list & creating copies, if at all possible.
             return index == 0 ? curveData.NodeSamples : curveData.NodeSamples.Skip(index).ToList();
@@ -496,7 +506,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// <param name="column">The column to add the note to.</param>
         /// <param name="startTime">The start time of the note.</param>
         /// <param name="endTime">The end time of the note (set to <paramref name="startTime"/> for a non-hold note).</param>
-        private void addToPattern(Pattern pattern, int column, double startTime, double endTime)
+        private void addToPattern(Pattern pattern, int column, int startTime, int endTime)
         {
             ManiaHitObject newObject;
 

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs

@@ -14,12 +14,17 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 {
     internal class EndTimeObjectPatternGenerator : PatternGenerator
     {
-        private readonly double endTime;
+        private readonly int endTime;
+        private readonly PatternType convertType;
 
-        public EndTimeObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, IBeatmap originalBeatmap)
-            : base(random, hitObject, beatmap, new Pattern(), originalBeatmap)
+        public EndTimeObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
+            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
         {
-            endTime = (HitObject as IHasDuration)?.EndTime ?? 0;
+            endTime = (int)((HitObject as IHasDuration)?.EndTime ?? 0);
+
+            convertType = PreviousPattern.ColumnWithObjects == TotalColumns
+                ? PatternType.None
+                : PatternType.ForceNotStack;
         }
 
         public override IEnumerable<Pattern> Generate()
@@ -40,18 +45,25 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     break;
 
                 case 8:
-                    addToPattern(pattern, FindAvailableColumn(GetRandomColumn(), PreviousPattern), generateHold);
+                    addToPattern(pattern, getRandomColumn(), generateHold);
                     break;
 
                 default:
-                    if (TotalColumns > 0)
-                        addToPattern(pattern, GetRandomColumn(), generateHold);
+                    addToPattern(pattern, getRandomColumn(0), generateHold);
                     break;
             }
 
             return pattern;
         }
 
+        private int getRandomColumn(int? lowerBound = null)
+        {
+            if ((convertType & PatternType.ForceNotStack) > 0)
+                return FindAvailableColumn(GetRandomColumn(lowerBound), lowerBound, patterns: PreviousPattern);
+
+            return FindAvailableColumn(GetRandomColumn(lowerBound), lowerBound);
+        }
+
         /// <summary>
         /// Constructs and adds a note to a pattern.
         /// </summary>

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs

@@ -397,7 +397,11 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
                 case 4:
                     centreProbability = 0;
-                    p2 = Math.Min(p2 * 2, 0.2);
+
+                    // Stable requires rngValue > x, which is an inverse-probability. Lazer uses true probability (1 - x).
+                    // But multiplying this value by 2 (stable) is not the same operation as dividing it by 2 (lazer),
+                    // so it needs to be converted to from a probability and then back after the multiplication.
+                    p2 = 1 - Math.Max((1 - p2) * 2, 0.8);
                     p3 = 0;
                     break;
 
@@ -408,11 +412,20 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
                 case 6:
                     centreProbability = 0;
-                    p2 = Math.Min(p2 * 2, 0.5);
-                    p3 = Math.Min(p3 * 2, 0.15);
+
+                    // Stable requires rngValue > x, which is an inverse-probability. Lazer uses true probability (1 - x).
+                    // But multiplying this value by 2 (stable) is not the same operation as dividing it by 2 (lazer),
+                    // so it needs to be converted to from a probability and then back after the multiplication.
+                    p2 = 1 - Math.Max((1 - p2) * 2, 0.5);
+                    p3 = 1 - Math.Max((1 - p3) * 2, 0.85);
                     break;
             }
 
+            // The stable values were allowed to exceed 1, which indicate <0% probability.
+            // These values needs to be clamped otherwise GetRandomNoteCount() will throw an exception.
+            p2 = Math.Clamp(p2, 0, 1);
+            p3 = Math.Clamp(p3, 0, 1);
+
             double centreVal = Random.NextDouble();
             int noteCount = GetRandomNoteCount(p2, p3);
 

osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs

@@ -8,5 +8,6 @@ namespace osu.Game.Rulesets.Mania.Difficulty
     public class ManiaDifficultyAttributes : DifficultyAttributes
     {
         public double GreatHitWindow;
+        public double ScoreMultiplier;
     }
 }

osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Game.Beatmaps;
@@ -10,10 +11,12 @@ using osu.Game.Rulesets.Difficulty.Skills;
 using osu.Game.Rulesets.Mania.Beatmaps;
 using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
 using osu.Game.Rulesets.Mania.Difficulty.Skills;
+using osu.Game.Rulesets.Mania.MathUtils;
 using osu.Game.Rulesets.Mania.Mods;
 using osu.Game.Rulesets.Mania.Objects;
 using osu.Game.Rulesets.Mania.Scoring;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Rulesets.Mania.Difficulty
@@ -23,11 +26,13 @@ namespace osu.Game.Rulesets.Mania.Difficulty
         private const double star_scaling_factor = 0.018;
 
         private readonly bool isForCurrentRuleset;
+        private readonly double originalOverallDifficulty;
 
         public ManiaDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
             : base(ruleset, beatmap)
         {
             isForCurrentRuleset = beatmap.BeatmapInfo.Ruleset.Equals(ruleset.RulesetInfo);
+            originalOverallDifficulty = beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty;
         }
 
         protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
@@ -40,64 +45,33 @@ namespace osu.Game.Rulesets.Mania.Difficulty
 
             return new ManiaDifficultyAttributes
             {
-                StarRating = difficultyValue(skills) * star_scaling_factor,
+                StarRating = skills[0].DifficultyValue() * star_scaling_factor,
                 Mods = mods,
                 // Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be removed in the future
-                GreatHitWindow = (int)(hitWindows.WindowFor(HitResult.Great)) / clockRate,
+                GreatHitWindow = (int)Math.Ceiling(getHitWindow300(mods) / clockRate),
+                ScoreMultiplier = getScoreMultiplier(beatmap, mods),
                 MaxCombo = beatmap.HitObjects.Sum(h => h is HoldNote ? 2 : 1),
                 Skills = skills
             };
         }
 
-        private double difficultyValue(Skill[] skills)
-        {
-            // Preprocess the strains to find the maximum overall + individual (aggregate) strain from each section
-            var overall = skills.OfType<Overall>().Single();
-            var aggregatePeaks = new List<double>(Enumerable.Repeat(0.0, overall.StrainPeaks.Count));
-
-            foreach (var individual in skills.OfType<Individual>())
-            {
-                for (int i = 0; i < individual.StrainPeaks.Count; i++)
-                {
-                    double aggregate = individual.StrainPeaks[i] + overall.StrainPeaks[i];
-
-                    if (aggregate > aggregatePeaks[i])
-                        aggregatePeaks[i] = aggregate;
-                }
-            }
-
-            aggregatePeaks.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
-
-            double difficulty = 0;
-            double weight = 1;
-
-            // Difficulty is the weighted sum of the highest strains from every section.
-            foreach (double strain in aggregatePeaks)
-            {
-                difficulty += strain * weight;
-                weight *= 0.9;
-            }
-
-            return difficulty;
-        }
-
         protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
         {
-            for (int i = 1; i < beatmap.HitObjects.Count; i++)
-                yield return new ManiaDifficultyHitObject(beatmap.HitObjects[i], beatmap.HitObjects[i - 1], clockRate);
+            var sortedObjects = beatmap.HitObjects.ToArray();
+
+            LegacySortHelper<HitObject>.Sort(sortedObjects, Comparer<HitObject>.Create((a, b) => (int)Math.Round(a.StartTime) - (int)Math.Round(b.StartTime)));
+
+            for (int i = 1; i < sortedObjects.Length; i++)
+                yield return new ManiaDifficultyHitObject(sortedObjects[i], sortedObjects[i - 1], clockRate);
         }
 
-        protected override Skill[] CreateSkills(IBeatmap beatmap)
+        // Sorting is done in CreateDifficultyHitObjects, since the full list of hitobjects is required.
+        protected override IEnumerable<DifficultyHitObject> SortObjects(IEnumerable<DifficultyHitObject> input) => input;
+
+        protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[]
         {
-            int columnCount = ((ManiaBeatmap)beatmap).TotalColumns;
-
-            var skills = new List<Skill> { new Overall(columnCount) };
-
-            for (int i = 0; i < columnCount; i++)
-                skills.Add(new Individual(i, columnCount));
-
-            return skills.ToArray();
-        }
+            new Strain(((ManiaBeatmap)beatmap).TotalColumns)
+        };
 
         protected override Mod[] DifficultyAdjustmentMods
         {
@@ -122,12 +96,73 @@ namespace osu.Game.Rulesets.Mania.Difficulty
                     new ManiaModKey3(),
                     new ManiaModKey4(),
                     new ManiaModKey5(),
+                    new MultiMod(new ManiaModKey5(), new ManiaModDualStages()),
                     new ManiaModKey6(),
+                    new MultiMod(new ManiaModKey6(), new ManiaModDualStages()),
                     new ManiaModKey7(),
+                    new MultiMod(new ManiaModKey7(), new ManiaModDualStages()),
                     new ManiaModKey8(),
+                    new MultiMod(new ManiaModKey8(), new ManiaModDualStages()),
                     new ManiaModKey9(),
+                    new MultiMod(new ManiaModKey9(), new ManiaModDualStages()),
                 }).ToArray();
             }
         }
+
+        private int getHitWindow300(Mod[] mods)
+        {
+            if (isForCurrentRuleset)
+            {
+                double od = Math.Min(10.0, Math.Max(0, 10.0 - originalOverallDifficulty));
+                return applyModAdjustments(34 + 3 * od, mods);
+            }
+
+            if (Math.Round(originalOverallDifficulty) > 4)
+                return applyModAdjustments(34, mods);
+
+            return applyModAdjustments(47, mods);
+
+            static int applyModAdjustments(double value, Mod[] mods)
+            {
+                if (mods.Any(m => m is ManiaModHardRock))
+                    value /= 1.4;
+                else if (mods.Any(m => m is ManiaModEasy))
+                    value *= 1.4;
+
+                if (mods.Any(m => m is ManiaModDoubleTime))
+                    value *= 1.5;
+                else if (mods.Any(m => m is ManiaModHalfTime))
+                    value *= 0.75;
+
+                return (int)value;
+            }
+        }
+
+        private double getScoreMultiplier(IBeatmap beatmap, Mod[] mods)
+        {
+            double scoreMultiplier = 1;
+
+            foreach (var m in mods)
+            {
+                switch (m)
+                {
+                    case ManiaModNoFail _:
+                    case ManiaModEasy _:
+                    case ManiaModHalfTime _:
+                        scoreMultiplier *= 0.5;
+                        break;
+                }
+            }
+
+            var maniaBeatmap = (ManiaBeatmap)beatmap;
+            int diff = maniaBeatmap.TotalColumns - maniaBeatmap.OriginalTotalColumns;
+
+            if (diff > 0)
+                scoreMultiplier *= 0.9;
+            else if (diff < 0)
+                scoreMultiplier *= 0.9 + 0.04 * diff;
+
+            return scoreMultiplier;
+        }
     }
 }

osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceCalculator.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Extensions;
-using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Scoring;
@@ -29,8 +28,8 @@ namespace osu.Game.Rulesets.Mania.Difficulty
         private int countMeh;
         private int countMiss;
 
-        public ManiaPerformanceCalculator(Ruleset ruleset, WorkingBeatmap beatmap, ScoreInfo score)
-            : base(ruleset, beatmap, score)
+        public ManiaPerformanceCalculator(Ruleset ruleset, DifficultyAttributes attributes, ScoreInfo score)
+            : base(ruleset, attributes, score)
         {
         }
 

osu.Game.Rulesets.Mania/Difficulty/Skills/Individual.cs

@@ -1,47 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System.Linq;
-using osu.Game.Rulesets.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Difficulty.Skills;
-using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Objects;
-
-namespace osu.Game.Rulesets.Mania.Difficulty.Skills
-{
-    public class Individual : Skill
-    {
-        protected override double SkillMultiplier => 1;
-        protected override double StrainDecayBase => 0.125;
-
-        private readonly double[] holdEndTimes;
-
-        private readonly int column;
-
-        public Individual(int column, int columnCount)
-        {
-            this.column = column;
-
-            holdEndTimes = new double[columnCount];
-        }
-
-        protected override double StrainValueOf(DifficultyHitObject current)
-        {
-            var maniaCurrent = (ManiaDifficultyHitObject)current;
-            var endTime = maniaCurrent.BaseObject.GetEndTime();
-
-            try
-            {
-                if (maniaCurrent.BaseObject.Column != column)
-                    return 0;
-
-                // We give a slight bonus if something is held meanwhile
-                return holdEndTimes.Any(t => t > endTime) ? 2.5 : 2;
-            }
-            finally
-            {
-                holdEndTimes[maniaCurrent.BaseObject.Column] = endTime;
-            }
-        }
-    }
-}

osu.Game.Rulesets.Mania/Difficulty/Skills/Overall.cs

@@ -1,56 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using osu.Game.Rulesets.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Difficulty.Skills;
-using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
-using osu.Game.Rulesets.Objects;
-
-namespace osu.Game.Rulesets.Mania.Difficulty.Skills
-{
-    public class Overall : Skill
-    {
-        protected override double SkillMultiplier => 1;
-        protected override double StrainDecayBase => 0.3;
-
-        private readonly double[] holdEndTimes;
-
-        private readonly int columnCount;
-
-        public Overall(int columnCount)
-        {
-            this.columnCount = columnCount;
-
-            holdEndTimes = new double[columnCount];
-        }
-
-        protected override double StrainValueOf(DifficultyHitObject current)
-        {
-            var maniaCurrent = (ManiaDifficultyHitObject)current;
-            var endTime = maniaCurrent.BaseObject.GetEndTime();
-
-            double holdFactor = 1.0; // Factor in case something else is held
-            double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly
-
-            for (int i = 0; i < columnCount; i++)
-            {
-                // If there is at least one other overlapping end or note, then we get an addition, buuuuuut...
-                if (current.BaseObject.StartTime < holdEndTimes[i] && endTime > holdEndTimes[i])
-                    holdAddition = 1.0;
-
-                // ... this addition only is valid if there is _no_ other note with the same ending.
-                // Releasing multiple notes at the same time is just as easy as releasing one
-                if (endTime == holdEndTimes[i])
-                    holdAddition = 0;
-
-                // We give a slight bonus if something is held meanwhile
-                if (holdEndTimes[i] > endTime)
-                    holdFactor = 1.25;
-            }
-
-            holdEndTimes[maniaCurrent.BaseObject.Column] = endTime;
-
-            return (1 + holdAddition) * holdFactor;
-        }
-    }
-}

osu.Game.Rulesets.Mania/Difficulty/Skills/Strain.cs

@@ -0,0 +1,80 @@
+// 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.Utils;
+using osu.Game.Rulesets.Difficulty.Preprocessing;
+using osu.Game.Rulesets.Difficulty.Skills;
+using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Mania.Difficulty.Skills
+{
+    public class Strain : Skill
+    {
+        private const double individual_decay_base = 0.125;
+        private const double overall_decay_base = 0.30;
+
+        protected override double SkillMultiplier => 1;
+        protected override double StrainDecayBase => 1;
+
+        private readonly double[] holdEndTimes;
+        private readonly double[] individualStrains;
+
+        private double individualStrain;
+        private double overallStrain;
+
+        public Strain(int totalColumns)
+        {
+            holdEndTimes = new double[totalColumns];
+            individualStrains = new double[totalColumns];
+            overallStrain = 1;
+        }
+
+        protected override double StrainValueOf(DifficultyHitObject current)
+        {
+            var maniaCurrent = (ManiaDifficultyHitObject)current;
+            var endTime = maniaCurrent.BaseObject.GetEndTime();
+            var column = maniaCurrent.BaseObject.Column;
+
+            double holdFactor = 1.0; // Factor to all additional strains in case something else is held
+            double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly
+
+            // Fill up the holdEndTimes array
+            for (int i = 0; i < holdEndTimes.Length; ++i)
+            {
+                // If there is at least one other overlapping end or note, then we get an addition, buuuuuut...
+                if (Precision.DefinitelyBigger(holdEndTimes[i], maniaCurrent.BaseObject.StartTime, 1) && Precision.DefinitelyBigger(endTime, holdEndTimes[i], 1))
+                    holdAddition = 1.0;
+
+                // ... this addition only is valid if there is _no_ other note with the same ending. Releasing multiple notes at the same time is just as easy as releasing 1
+                if (Precision.AlmostEquals(endTime, holdEndTimes[i], 1))
+                    holdAddition = 0;
+
+                // We give a slight bonus to everything if something is held meanwhile
+                if (Precision.DefinitelyBigger(holdEndTimes[i], endTime, 1))
+                    holdFactor = 1.25;
+
+                // Decay individual strains
+                individualStrains[i] = applyDecay(individualStrains[i], current.DeltaTime, individual_decay_base);
+            }
+
+            holdEndTimes[column] = endTime;
+
+            // Increase individual strain in own column
+            individualStrains[column] += 2.0 * holdFactor;
+            individualStrain = individualStrains[column];
+
+            overallStrain = applyDecay(overallStrain, current.DeltaTime, overall_decay_base) + (1 + holdAddition) * holdFactor;
+
+            return individualStrain + overallStrain - CurrentStrain;
+        }
+
+        protected override double GetPeakStrain(double offset)
+            => applyDecay(individualStrain, offset - Previous[0].BaseObject.StartTime, individual_decay_base)
+               + applyDecay(overallStrain, offset - Previous[0].BaseObject.StartTime, overall_decay_base);
+
+        private double applyDecay(double value, double deltaTime, double decayBase)
+            => value * Math.Pow(decayBase, deltaTime / 1000);
+    }
+}

osu.Game.Rulesets.Mania/Edit/ManiaBeatSnapGrid.cs

@@ -204,10 +204,6 @@ namespace osu.Game.Rulesets.Mania.Edit
             protected override void UpdateInitialTransforms()
             {
                 // don't perform any fading – we are handling that ourselves.
-            }
-
-            protected override void UpdateStateTransforms(ArmedState state)
-            {
                 LifetimeEnd = HitObject.StartTime + visible_range;
             }
         }

osu.Game.Rulesets.Mania/Edit/ManiaBlueprintContainer.cs

@@ -1,7 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System.Collections.Generic;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Mania.Edit.Blueprints;
 using osu.Game.Rulesets.Mania.Objects.Drawables;
@@ -12,8 +11,8 @@ namespace osu.Game.Rulesets.Mania.Edit
 {
     public class ManiaBlueprintContainer : ComposeBlueprintContainer
     {
-        public ManiaBlueprintContainer(IEnumerable<DrawableHitObject> drawableHitObjects)
-            : base(drawableHitObjects)
+        public ManiaBlueprintContainer(HitObjectComposer composer)
+            : base(composer)
         {
         }
 

osu.Game.Rulesets.Mania/Edit/ManiaHitObjectComposer.cs

@@ -13,7 +13,6 @@ using osu.Game.Rulesets.Mania.Objects.Drawables.Pieces;
 using osu.Game.Rulesets.Mania.UI;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
-using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.UI;
 using osu.Game.Rulesets.UI.Scrolling;
 using osu.Game.Screens.Edit.Compose.Components;
@@ -89,8 +88,8 @@ namespace osu.Game.Rulesets.Mania.Edit
             return drawableRuleset;
         }
 
-        protected override ComposeBlueprintContainer CreateBlueprintContainer(IEnumerable<DrawableHitObject> hitObjects)
-            => new ManiaBlueprintContainer(hitObjects);
+        protected override ComposeBlueprintContainer CreateBlueprintContainer()
+            => new ManiaBlueprintContainer(this);
 
         protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new HitObjectCompositionTool[]
         {

osu.Game.Rulesets.Mania/Edit/ManiaSelectionHandler.cs

@@ -45,7 +45,7 @@ namespace osu.Game.Rulesets.Mania.Edit
             int minColumn = int.MaxValue;
             int maxColumn = int.MinValue;
 
-            foreach (var obj in SelectedHitObjects.OfType<ManiaHitObject>())
+            foreach (var obj in EditorBeatmap.SelectedHitObjects.OfType<ManiaHitObject>())
             {
                 if (obj.Column < minColumn)
                     minColumn = obj.Column;
@@ -55,7 +55,7 @@ namespace osu.Game.Rulesets.Mania.Edit
 
             columnDelta = Math.Clamp(columnDelta, -minColumn, maniaPlayfield.TotalColumns - 1 - maxColumn);
 
-            foreach (var obj in SelectedHitObjects.OfType<ManiaHitObject>())
+            foreach (var obj in EditorBeatmap.SelectedHitObjects.OfType<ManiaHitObject>())
                 obj.Column += columnDelta;
         }
     }

osu.Game.Rulesets.Mania/Judgements/ManiaJudgement.cs

@@ -2,10 +2,40 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Rulesets.Mania.Judgements
 {
     public class ManiaJudgement : Judgement
     {
+        protected override double HealthIncreaseFor(HitResult result)
+        {
+            switch (result)
+            {
+                case HitResult.LargeTickHit:
+                    return DEFAULT_MAX_HEALTH_INCREASE * 0.1;
+
+                case HitResult.LargeTickMiss:
+                    return -DEFAULT_MAX_HEALTH_INCREASE * 0.1;
+
+                case HitResult.Meh:
+                    return -DEFAULT_MAX_HEALTH_INCREASE * 0.5;
+
+                case HitResult.Ok:
+                    return -DEFAULT_MAX_HEALTH_INCREASE * 0.3;
+
+                case HitResult.Good:
+                    return DEFAULT_MAX_HEALTH_INCREASE * 0.1;
+
+                case HitResult.Great:
+                    return DEFAULT_MAX_HEALTH_INCREASE * 0.8;
+
+                case HitResult.Perfect:
+                    return DEFAULT_MAX_HEALTH_INCREASE;
+
+                default:
+                    return base.HealthIncreaseFor(result);
+            }
+        }
     }
 }

osu.Game.Rulesets.Mania/ManiaRuleset.cs

@@ -49,7 +49,7 @@ namespace osu.Game.Rulesets.Mania
 
         public override IBeatmapConverter CreateBeatmapConverter(IBeatmap beatmap) => new ManiaBeatmapConverter(beatmap, this);
 
-        public override PerformanceCalculator CreatePerformanceCalculator(WorkingBeatmap beatmap, ScoreInfo score) => new ManiaPerformanceCalculator(this, beatmap, score);
+        public override PerformanceCalculator CreatePerformanceCalculator(DifficultyAttributes attributes, ScoreInfo score) => new ManiaPerformanceCalculator(this, attributes, score);
 
         public const string SHORT_NAME = "mania";
 
@@ -319,6 +319,31 @@ namespace osu.Game.Rulesets.Mania
             return (PlayfieldType)Enum.GetValues(typeof(PlayfieldType)).Cast<int>().OrderByDescending(i => i).First(v => variant >= v);
         }
 
+        protected override IEnumerable<HitResult> GetValidHitResults()
+        {
+            return new[]
+            {
+                HitResult.Perfect,
+                HitResult.Great,
+                HitResult.Good,
+                HitResult.Ok,
+                HitResult.Meh,
+
+                HitResult.LargeTickHit,
+            };
+        }
+
+        public override string GetDisplayNameForHitResult(HitResult result)
+        {
+            switch (result)
+            {
+                case HitResult.LargeTickHit:
+                    return "hold tick";
+            }
+
+            return base.GetDisplayNameForHitResult(result);
+        }
+
         public override StatisticRow[] CreateStatisticsForScore(ScoreInfo score, IBeatmap playableBeatmap) => new[]
         {
             new StatisticRow

osu.Game.Rulesets.Mania/ManiaSettingsSubsection.cs

@@ -29,12 +29,12 @@ namespace osu.Game.Rulesets.Mania
                 new SettingsEnumDropdown<ManiaScrollingDirection>
                 {
                     LabelText = "Scrolling direction",
-                    Bindable = config.GetBindable<ManiaScrollingDirection>(ManiaRulesetSetting.ScrollDirection)
+                    Current = config.GetBindable<ManiaScrollingDirection>(ManiaRulesetSetting.ScrollDirection)
                 },
                 new SettingsSlider<double, TimeSlider>
                 {
                     LabelText = "Scroll speed",
-                    Bindable = config.GetBindable<double>(ManiaRulesetSetting.ScrollTime),
+                    Current = config.GetBindable<double>(ManiaRulesetSetting.ScrollTime),
                     KeyboardStep = 5
                 },
             };

osu.Game.Rulesets.Mania/MathUtils/LegacySortHelper.cs

@@ -0,0 +1,165 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Contracts;
+
+namespace osu.Game.Rulesets.Mania.MathUtils
+{
+    /// <summary>
+    /// Provides access to .NET4.0 unstable sorting methods.
+    /// </summary>
+    /// <remarks>
+    /// Source: https://referencesource.microsoft.com/#mscorlib/system/collections/generic/arraysorthelper.cs
+    /// Copyright (c) Microsoft Corporation.  All rights reserved.
+    /// </remarks>
+    internal static class LegacySortHelper<T>
+    {
+        private const int quick_sort_depth_threshold = 32;
+
+        public static void Sort(T[] keys, IComparer<T> comparer)
+        {
+            if (keys == null)
+                throw new ArgumentNullException(nameof(keys));
+
+            if (keys.Length == 0)
+                return;
+
+            comparer ??= Comparer<T>.Default;
+            depthLimitedQuickSort(keys, 0, keys.Length - 1, comparer, quick_sort_depth_threshold);
+        }
+
+        private static void depthLimitedQuickSort(T[] keys, int left, int right, IComparer<T> comparer, int depthLimit)
+        {
+            do
+            {
+                if (depthLimit == 0)
+                {
+                    heapsort(keys, left, right, comparer);
+                    return;
+                }
+
+                int i = left;
+                int j = right;
+
+                // pre-sort the low, middle (pivot), and high values in place.
+                // this improves performance in the face of already sorted data, or
+                // data that is made up of multiple sorted runs appended together.
+                int middle = i + ((j - i) >> 1);
+                swapIfGreater(keys, comparer, i, middle); // swap the low with the mid point
+                swapIfGreater(keys, comparer, i, j); // swap the low with the high
+                swapIfGreater(keys, comparer, middle, j); // swap the middle with the high
+
+                T x = keys[middle];
+
+                do
+                {
+                    while (comparer.Compare(keys[i], x) < 0) i++;
+                    while (comparer.Compare(x, keys[j]) < 0) j--;
+                    Contract.Assert(i >= left && j <= right, "(i>=left && j<=right)  Sort failed - Is your IComparer bogus?");
+                    if (i > j) break;
+
+                    if (i < j)
+                    {
+                        T key = keys[i];
+                        keys[i] = keys[j];
+                        keys[j] = key;
+                    }
+
+                    i++;
+                    j--;
+                } while (i <= j);
+
+                // The next iteration of the while loop is to "recursively" sort the larger half of the array and the
+                // following calls recrusively sort the smaller half.  So we subtrack one from depthLimit here so
+                // both sorts see the new value.
+                depthLimit--;
+
+                if (j - left <= right - i)
+                {
+                    if (left < j) depthLimitedQuickSort(keys, left, j, comparer, depthLimit);
+                    left = i;
+                }
+                else
+                {
+                    if (i < right) depthLimitedQuickSort(keys, i, right, comparer, depthLimit);
+                    right = j;
+                }
+            } while (left < right);
+        }
+
+        private static void heapsort(T[] keys, int lo, int hi, IComparer<T> comparer)
+        {
+            Contract.Requires(keys != null);
+            Contract.Requires(comparer != null);
+            Contract.Requires(lo >= 0);
+            Contract.Requires(hi > lo);
+            Contract.Requires(hi < keys.Length);
+
+            int n = hi - lo + 1;
+
+            for (int i = n / 2; i >= 1; i = i - 1)
+            {
+                downHeap(keys, i, n, lo, comparer);
+            }
+
+            for (int i = n; i > 1; i = i - 1)
+            {
+                swap(keys, lo, lo + i - 1);
+                downHeap(keys, 1, i - 1, lo, comparer);
+            }
+        }
+
+        private static void downHeap(T[] keys, int i, int n, int lo, IComparer<T> comparer)
+        {
+            Contract.Requires(keys != null);
+            Contract.Requires(comparer != null);
+            Contract.Requires(lo >= 0);
+            Contract.Requires(lo < keys.Length);
+
+            T d = keys[lo + i - 1];
+
+            while (i <= n / 2)
+            {
+                var child = 2 * i;
+
+                if (child < n && comparer.Compare(keys[lo + child - 1], keys[lo + child]) < 0)
+                {
+                    child++;
+                }
+
+                if (!(comparer.Compare(d, keys[lo + child - 1]) < 0))
+                    break;
+
+                keys[lo + i - 1] = keys[lo + child - 1];
+                i = child;
+            }
+
+            keys[lo + i - 1] = d;
+        }
+
+        private static void swap(T[] a, int i, int j)
+        {
+            if (i != j)
+            {
+                T t = a[i];
+                a[i] = a[j];
+                a[j] = t;
+            }
+        }
+
+        private static void swapIfGreater(T[] keys, IComparer<T> comparer, int a, int b)
+        {
+            if (a != b)
+            {
+                if (comparer.Compare(keys[a], keys[b]) > 0)
+                {
+                    T key = keys[a];
+                    keys[a] = keys[b];
+                    keys[b] = key;
+                }
+            }
+        }
+    }
+}

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

@@ -39,6 +39,7 @@ namespace osu.Game.Rulesets.Mania.Mods
             typeof(ManiaModKey7),
             typeof(ManiaModKey8),
             typeof(ManiaModKey9),
+            typeof(ManiaModKey10),
         }.Except(new[] { GetType() }).ToArray();
     }
 }

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableBarLine.cs

@@ -1,10 +1,9 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using osuTK;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
-using osu.Game.Rulesets.Objects.Drawables;
+using osuTK;
 using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Mania.Objects.Drawables
@@ -71,6 +70,6 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
         {
         }
 
-        protected override void UpdateStateTransforms(ArmedState state) => this.FadeOut(150);
+        protected override void UpdateStartTimeStateTransforms() => this.FadeOut(150);
     }
 }

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNote.cs

@@ -229,12 +229,6 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             }
         }
 
-        protected override void UpdateStateTransforms(ArmedState state)
-        {
-            using (BeginDelayedSequence(HitObject.Duration, true))
-                base.UpdateStateTransforms(state);
-        }
-
         protected override void CheckForResult(bool userTriggered, double timeOffset)
         {
             if (Tail.AllJudged)
@@ -243,7 +237,7 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
                 endHold();
             }
 
-            if (Tail.Result.Type == HitResult.Miss)
+            if (Tail.Judged && !Tail.IsHit)
                 HasBroken = true;
         }
 
@@ -255,6 +249,10 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             if (action != Action.Value)
                 return false;
 
+            // do not run any of this logic when rewinding, as it inverts order of presses/releases.
+            if (Time.Elapsed < 0)
+                return false;
+
             if (CheckHittable?.Invoke(this, Time.Current) == false)
                 return false;
 
@@ -287,6 +285,10 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             if (action != Action.Value)
                 return;
 
+            // do not run any of this logic when rewinding, as it inverts order of presses/releases.
+            if (Time.Elapsed < 0)
+                return;
+
             // Make sure a hold was started
             if (HoldStartTime == null)
                 return;

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNoteHead.cs

@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using osu.Game.Rulesets.Objects.Drawables;
-
 namespace osu.Game.Rulesets.Mania.Objects.Drawables
 {
     /// <summary>
@@ -19,8 +17,10 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
 
         public void UpdateResult() => base.UpdateResult(true);
 
-        protected override void UpdateStateTransforms(ArmedState state)
+        protected override void UpdateInitialTransforms()
         {
+            base.UpdateInitialTransforms();
+
             // This hitobject should never expire, so this is just a safe maximum.
             LifetimeEnd = LifetimeStart + 30000;
         }

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNoteTail.cs

@@ -40,7 +40,7 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             if (!userTriggered)
             {
                 if (!HitObject.HitWindows.CanBeHit(timeOffset))
-                    ApplyResult(r => r.Type = HitResult.Miss);
+                    ApplyResult(r => r.Type = r.Judgement.MinResult);
 
                 return;
             }

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableManiaHitObject.cs

@@ -9,7 +9,6 @@ using osu.Framework.Graphics;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.UI.Scrolling;
 using osu.Game.Rulesets.Mania.UI;
-using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Rulesets.Mania.Objects.Drawables
 {
@@ -119,7 +118,7 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             Anchor = Origin = e.NewValue == ScrollingDirection.Up ? Anchor.TopCentre : Anchor.BottomCentre;
         }
 
-        protected override void UpdateStateTransforms(ArmedState state)
+        protected override void UpdateHitStateTransforms(ArmedState state)
         {
             switch (state)
             {
@@ -136,7 +135,7 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
         /// <summary>
         /// Causes this <see cref="DrawableManiaHitObject"/> to get missed, disregarding all conditions in implementations of <see cref="DrawableHitObject.CheckForResult"/>.
         /// </summary>
-        public void MissForcefully() => ApplyResult(r => r.Type = HitResult.Miss);
+        public void MissForcefully() => ApplyResult(r => r.Type = r.Judgement.MinResult);
     }
 
     public abstract class DrawableManiaHitObject<TObject> : DrawableManiaHitObject

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableNote.cs

@@ -48,7 +48,7 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
             if (!userTriggered)
             {
                 if (!HitObject.HitWindows.CanBeHit(timeOffset))
-                    ApplyResult(r => r.Type = HitResult.Miss);
+                    ApplyResult(r => r.Type = r.Judgement.MinResult);
                 return;
             }
 

osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/convert-samples-expected-conversion.json

@@ -6,20 +6,20 @@
       "EndTime": 2750.0,
       "Column": 1,
       "NodeSamples": [
-        ["normal-hitnormal"],
-        ["soft-hitnormal"],
-        ["drum-hitnormal"]
+        ["Gameplay/normal-hitnormal"],
+        ["Gameplay/soft-hitnormal"],
+        ["Gameplay/drum-hitnormal"]
       ],
-      "Samples": ["drum-hitnormal"]
+      "Samples": ["Gameplay/-hitnormal"]
     }, {
       "StartTime": 1875.0,
       "EndTime": 2750.0,
       "Column": 0,
       "NodeSamples": [
-        ["soft-hitnormal"],
-        ["drum-hitnormal"]
+        ["Gameplay/soft-hitnormal"],
+        ["Gameplay/drum-hitnormal"]
       ],
-      "Samples": ["drum-hitnormal"]
+      "Samples": ["Gameplay/-hitnormal"]
     }]
   }, {
     "StartTime": 3750.0,
@@ -27,7 +27,7 @@
       "StartTime": 3750.0,
       "EndTime": 3750.0,
       "Column": 3,
-      "Samples": ["normal-hitnormal"]
+      "Samples": ["Gameplay/normal-hitnormal"]
     }]
   }]
 }

osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/mania-samples-expected-conversion.json

@@ -6,10 +6,10 @@
       "EndTime": 1500.0,
       "Column": 0,
       "NodeSamples": [
-        ["normal-hitnormal"],
+        ["Gameplay/normal-hitnormal"],
         []
       ],
-      "Samples": ["normal-hitnormal"]
+      "Samples": ["Gameplay/normal-hitnormal"]
     }]
   }, {
     "StartTime": 2000.0,
@@ -18,10 +18,10 @@
       "EndTime": 3000.0,
       "Column": 2,
       "NodeSamples": [
-        ["drum-hitnormal"],
+        ["Gameplay/drum-hitnormal"],
         []
       ],
-      "Samples": ["drum-hitnormal"]
+      "Samples": ["Gameplay/drum-hitnormal"]
     }]
   }]
 }

osu.Game.Rulesets.Mania/Resources/Testing/Beatmaps/slider-convert-samples-expected-conversion.json

@@ -5,17 +5,17 @@
       "StartTime": 8470.0,
       "EndTime": 8470.0,
       "Column": 0,
-      "Samples": ["normal-hitnormal", "normal-hitclap"]
+      "Samples": ["Gameplay/normal-hitnormal", "Gameplay/normal-hitclap"]
     }, {
       "StartTime": 8626.470587768974,
       "EndTime": 8626.470587768974,
       "Column": 1,
-      "Samples": ["normal-hitnormal"]
+      "Samples": ["Gameplay/normal-hitnormal"]
     }, {
       "StartTime": 8782.941175537948,
       "EndTime": 8782.941175537948,
       "Column": 2,
-      "Samples": ["normal-hitnormal", "normal-hitclap"]
+      "Samples": ["Gameplay/normal-hitnormal", "Gameplay/normal-hitclap"]
     }]
   }]
 }

osu.Game.Rulesets.Mania/UI/OrderedHitPolicy.cs

@@ -1,7 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using System.Collections.Generic;
 using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Game.Rulesets.Mania.Objects.Drawables;
@@ -44,9 +43,6 @@ namespace osu.Game.Rulesets.Mania.UI
         /// <param name="hitObject">The <see cref="HitObject"/> that was hit.</param>
         public void HandleHit(DrawableHitObject hitObject)
         {
-            if (!IsHittable(hitObject, hitObject.HitObject.StartTime + hitObject.Result.TimeOffset))
-                throw new InvalidOperationException($"A {hitObject} was hit before it became hittable!");
-
             foreach (var obj in enumerateHitObjectsUpTo(hitObject.HitObject.StartTime))
             {
                 if (obj.Judged)

osu.Game.Rulesets.Osu.Tests/.vscode/tasks.json

@@ -11,9 +11,9 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Osu.Tests.csproj",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"
@@ -26,10 +26,10 @@
                 "build",
                 "--no-restore",
                 "osu.Game.Rulesets.Osu.Tests.csproj",
-                "/p:Configuration=Release",
-                "/p:GenerateFullPaths=true",
-                "/m",
-                "/verbosity:m"
+                "-p:Configuration=Release",
+                "-p:GenerateFullPaths=true",
+                "-m",
+                "-verbosity:m"
             ],
             "group": "build",
             "problemMatcher": "$msCompile"

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

@@ -280,8 +280,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Editor
 
         private void addClickStep(MouseButton button)
         {
-            AddStep($"press {button}", () => InputManager.PressButton(button));
-            AddStep($"release {button}", () => InputManager.ReleaseButton(button));
+            AddStep($"click {button}", () => InputManager.Click(button));
         }
 
         private void assertPlaced(bool expected) => AddAssert($"slider {(expected ? "placed" : "not placed")}", () => (getSlider() != null) == expected);
@@ -295,7 +294,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Editor
         private void assertControlPointPosition(int index, Vector2 position) =>
             AddAssert($"control point {index} at {position}", () => Precision.AlmostEquals(position, getSlider().Path.ControlPoints[index].Position.Value, 1));
 
-        private Slider getSlider() => HitObjectContainer.Count > 0 ? (Slider)((DrawableSlider)HitObjectContainer[0]).HitObject : null;
+        private Slider getSlider() => HitObjectContainer.Count > 0 ? ((DrawableSlider)HitObjectContainer[0]).HitObject : null;
 
         protected override DrawableHitObject CreateHitObject(HitObject hitObject) => new DrawableSlider((Slider)hitObject);
         protected override PlacementBlueprint CreateBlueprint() => new SliderPlacementBlueprint();

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

@@ -28,7 +28,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Mods
             Mod = new OsuModSpunOut(),
             Autoplay = false,
             Beatmap = singleSpinnerBeatmap,
-            PassCondition = () => Player.ChildrenOfType<DrawableSpinner>().Single().Progress >= 1
+            PassCondition = () => Player.ChildrenOfType<DrawableSpinner>().SingleOrDefault()?.Progress >= 1
         });
 
         [TestCase(null)]
@@ -45,7 +45,11 @@ namespace osu.Game.Rulesets.Osu.Tests.Mods
                 Mods = mods,
                 Autoplay = false,
                 Beatmap = singleSpinnerBeatmap,
-                PassCondition = () => Precision.AlmostEquals(Player.ChildrenOfType<SpinnerSpmCounter>().Single().SpinsPerMinute, 286, 1)
+                PassCondition = () =>
+                {
+                    var counter = Player.ChildrenOfType<SpinnerSpmCounter>().SingleOrDefault();
+                    return counter != null && Precision.AlmostEquals(counter.SpinsPerMinute, 286, 1);
+                }
             });
         }
 

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

@@ -0,0 +1,41 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.UI;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public class TestPlayfieldBorder : OsuTestScene
+    {
+        public TestPlayfieldBorder()
+        {
+            Bindable<PlayfieldBorderStyle> playfieldBorderStyle = new Bindable<PlayfieldBorderStyle>();
+
+            AddStep("add drawables", () =>
+            {
+                Child = new Container
+                {
+                    Size = new Vector2(400, 300),
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Children = new Drawable[]
+                    {
+                        new PlayfieldBorder
+                        {
+                            PlayfieldBorderStyle = { BindTarget = playfieldBorderStyle }
+                        }
+                    }
+                };
+            });
+
+            AddStep("Set none", () => playfieldBorderStyle.Value = PlayfieldBorderStyle.None);
+            AddStep("Set corners", () => playfieldBorderStyle.Value = PlayfieldBorderStyle.Corners);
+            AddStep("Set full", () => playfieldBorderStyle.Value = PlayfieldBorderStyle.Full);
+        }
+    }
+}

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

@@ -171,7 +171,7 @@ namespace osu.Game.Rulesets.Osu.Tests
                     }
 
                     hitObjectContainer.Add(drawableObject);
-                    followPointRenderer.AddFollowPoints(drawableObject);
+                    followPointRenderer.AddFollowPoints(objects[i]);
                 }
             });
         }
@@ -180,10 +180,10 @@ namespace osu.Game.Rulesets.Osu.Tests
         {
             AddStep("remove hitobject", () =>
             {
-                var drawableObject = getFunc?.Invoke();
+                var drawableObject = getFunc.Invoke();
 
                 hitObjectContainer.Remove(drawableObject);
-                followPointRenderer.RemoveFollowPoints(drawableObject);
+                followPointRenderer.RemoveFollowPoints(drawableObject.HitObject);
             });
         }
 
@@ -215,10 +215,10 @@ namespace osu.Game.Rulesets.Osu.Tests
                     DrawableOsuHitObject expectedStart = getObject(i);
                     DrawableOsuHitObject expectedEnd = i < hitObjectContainer.Count - 1 ? getObject(i + 1) : null;
 
-                    if (getGroup(i).Start != expectedStart)
+                    if (getGroup(i).Start != expectedStart.HitObject)
                         throw new AssertionException($"Object {i} expected to be the start of group {i}.");
 
-                    if (getGroup(i).End != expectedEnd)
+                    if (getGroup(i).End != expectedEnd?.HitObject)
                         throw new AssertionException($"Object {(expectedEnd == null ? "null" : i.ToString())} expected to be the end of group {i}.");
                 }
 

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

@@ -20,7 +20,8 @@ namespace osu.Game.Rulesets.Osu.Tests
     {
         private int depthIndex;
 
-        public TestSceneHitCircle()
+        [Test]
+        public void TestVariousHitCircles()
         {
             AddStep("Miss Big Single", () => SetContents(() => testSingle(2)));
             AddStep("Miss Medium Single", () => SetContents(() => testSingle(5)));

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

@@ -0,0 +1,44 @@
+// 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.Timing;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public class TestSceneHitCircleApplication : OsuTestScene
+    {
+        [Test]
+        public void TestApplyNewCircle()
+        {
+            DrawableHitCircle dho = null;
+
+            AddStep("create circle", () => Child = dho = new DrawableHitCircle(prepareObject(new HitCircle
+            {
+                Position = new Vector2(256, 192),
+                IndexInCurrentCombo = 0
+            }))
+            {
+                Clock = new FramedClock(new StopwatchClock())
+            });
+
+            AddStep("apply new circle", () => dho.Apply(prepareObject(new HitCircle
+            {
+                Position = new Vector2(128, 128),
+                ComboIndex = 1,
+            }), null));
+        }
+
+        private HitCircle prepareObject(HitCircle circle)
+        {
+            circle.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+            return circle;
+        }
+    }
+}

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

@@ -40,7 +40,7 @@ namespace osu.Game.Rulesets.Osu.Tests
                 {
                     HitObjects = { new HitCircle { Position = new Vector2(256, 192) } }
                 },
-                PassCondition = () => Player.Results.Count > 0 && Player.Results[0].TimeOffset < -hitWindows.WindowFor(HitResult.Meh) && Player.Results[0].Type == HitResult.Miss
+                PassCondition = () => Player.Results.Count > 0 && Player.Results[0].TimeOffset < -hitWindows.WindowFor(HitResult.Meh) && !Player.Results[0].IsHit
             });
         }
 
@@ -59,7 +59,7 @@ namespace osu.Game.Rulesets.Osu.Tests
             {
                 Autoplay = false,
                 Beatmap = beatmap,
-                PassCondition = () => Player.Results.Count > 0 && Player.Results[0].TimeOffset >= hitWindows.WindowFor(HitResult.Meh) && Player.Results[0].Type == HitResult.Miss
+                PassCondition = () => Player.Results.Count > 0 && Player.Results[0].TimeOffset >= hitWindows.WindowFor(HitResult.Meh) && !Player.Results[0].IsHit
             });
         }
 

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

@@ -125,6 +125,9 @@ namespace osu.Game.Rulesets.Osu.Tests
             {
                 if (!enabled) return null;
 
+                if (component is OsuSkinComponent osuComponent && osuComponent.Component == OsuSkinComponents.SliderBody)
+                    return null;
+
                 return new OsuSpriteText
                 {
                     Text = identifier,

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

@@ -27,7 +27,8 @@ namespace osu.Game.Rulesets.Osu.Tests
     {
         private int depthIndex;
 
-        public TestSceneSlider()
+        [Test]
+        public void TestVariousSliders()
         {
             AddStep("Big Single", () => SetContents(() => testSimpleBig()));
             AddStep("Medium Single", () => SetContents(() => testSimpleMedium()));
@@ -111,10 +112,10 @@ namespace osu.Game.Rulesets.Osu.Tests
                 new HitSampleInfo { Name = HitSampleInfo.HIT_WHISTLE },
             });
 
-            AddAssert("head samples updated", () => assertSamples(((Slider)slider.HitObject).HeadCircle));
-            AddAssert("tick samples not updated", () => ((Slider)slider.HitObject).NestedHitObjects.OfType<SliderTick>().All(assertTickSamples));
-            AddAssert("repeat samples updated", () => ((Slider)slider.HitObject).NestedHitObjects.OfType<SliderRepeat>().All(assertSamples));
-            AddAssert("tail has no samples", () => ((Slider)slider.HitObject).TailCircle.Samples.Count == 0);
+            AddAssert("head samples updated", () => assertSamples(slider.HitObject.HeadCircle));
+            AddAssert("tick samples not updated", () => slider.HitObject.NestedHitObjects.OfType<SliderTick>().All(assertTickSamples));
+            AddAssert("repeat samples updated", () => slider.HitObject.NestedHitObjects.OfType<SliderRepeat>().All(assertSamples));
+            AddAssert("tail has no samples", () => slider.HitObject.TailCircle.Samples.Count == 0);
 
             static bool assertTickSamples(SliderTick tick) => tick.Samples.Single().Name == "slidertick";
 
@@ -135,7 +136,7 @@ namespace osu.Game.Rulesets.Osu.Tests
                 slider = (DrawableSlider)createSlider(repeats: 1);
 
                 for (int i = 0; i < 2; i++)
-                    ((Slider)slider.HitObject).NodeSamples.Add(new List<HitSampleInfo> { new HitSampleInfo { Name = HitSampleInfo.HIT_FINISH } });
+                    slider.HitObject.NodeSamples.Add(new List<HitSampleInfo> { new HitSampleInfo { Name = HitSampleInfo.HIT_FINISH } });
 
                 Add(slider);
             });
@@ -146,10 +147,10 @@ namespace osu.Game.Rulesets.Osu.Tests
                 new HitSampleInfo { Name = HitSampleInfo.HIT_WHISTLE },
             });
 
-            AddAssert("head samples not updated", () => assertSamples(((Slider)slider.HitObject).HeadCircle));
-            AddAssert("tick samples not updated", () => ((Slider)slider.HitObject).NestedHitObjects.OfType<SliderTick>().All(assertTickSamples));
-            AddAssert("repeat samples not updated", () => ((Slider)slider.HitObject).NestedHitObjects.OfType<SliderRepeat>().All(assertSamples));
-            AddAssert("tail has no samples", () => ((Slider)slider.HitObject).TailCircle.Samples.Count == 0);
+            AddAssert("head samples not updated", () => assertSamples(slider.HitObject.HeadCircle));
+            AddAssert("tick samples not updated", () => slider.HitObject.NestedHitObjects.OfType<SliderTick>().All(assertTickSamples));
+            AddAssert("repeat samples not updated", () => slider.HitObject.NestedHitObjects.OfType<SliderRepeat>().All(assertSamples));
+            AddAssert("tail has no samples", () => slider.HitObject.TailCircle.Samples.Count == 0);
 
             static bool assertTickSamples(SliderTick tick) => tick.Samples.Single().Name == "slidertick";
 

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

@@ -0,0 +1,59 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public class TestSceneSliderApplication : OsuTestScene
+    {
+        [Test]
+        public void TestApplyNewSlider()
+        {
+            DrawableSlider dho = null;
+
+            AddStep("create slider", () => Child = dho = new DrawableSlider(prepareObject(new Slider
+            {
+                Position = new Vector2(256, 192),
+                IndexInCurrentCombo = 0,
+                StartTime = Time.Current,
+                Path = new SliderPath(PathType.Linear, new[]
+                {
+                    Vector2.Zero,
+                    new Vector2(150, 100),
+                    new Vector2(300, 0),
+                })
+            })));
+
+            AddWaitStep("wait for progression", 1);
+
+            AddStep("apply new slider", () => dho.Apply(prepareObject(new Slider
+            {
+                Position = new Vector2(256, 192),
+                ComboIndex = 1,
+                StartTime = dho.HitObject.StartTime,
+                Path = new SliderPath(PathType.Bezier, new[]
+                {
+                    Vector2.Zero,
+                    new Vector2(150, 100),
+                    new Vector2(300, 0),
+                }),
+                RepeatCount = 1
+            }), null));
+        }
+
+        private Slider prepareObject(Slider slider)
+        {
+            slider.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+            return slider;
+        }
+    }
+}

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

@@ -314,11 +314,11 @@ namespace osu.Game.Rulesets.Osu.Tests
 
         private bool assertMaxJudge() => judgementResults.Any() && judgementResults.All(t => t.Type == t.Judgement.MaxResult);
 
-        private bool assertHeadMissTailTracked() => judgementResults[^2].Type == HitResult.IgnoreHit && judgementResults.First().Type == HitResult.Miss;
+        private bool assertHeadMissTailTracked() => judgementResults[^2].Type == HitResult.SmallTickHit && !judgementResults.First().IsHit;
 
-        private bool assertMidSliderJudgements() => judgementResults[^2].Type == HitResult.IgnoreHit;
+        private bool assertMidSliderJudgements() => judgementResults[^2].Type == HitResult.SmallTickHit;
 
-        private bool assertMidSliderJudgementFail() => judgementResults[^2].Type == HitResult.IgnoreMiss;
+        private bool assertMidSliderJudgementFail() => judgementResults[^2].Type == HitResult.SmallTickMiss;
 
         private ScoreAccessibleReplayPlayer currentPlayer;
 

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

@@ -51,7 +51,7 @@ namespace osu.Game.Rulesets.Osu.Tests
             config.BindWith(OsuRulesetSetting.SnakingOutSliders, snakingOut);
         }
 
-        private DrawableSlider slider;
+        private DrawableSlider drawableSlider;
 
         [SetUpSteps]
         public override void SetUpSteps()
@@ -68,7 +68,8 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddUntilStep("wait for track to start running", () => Beatmap.Value.Track.IsRunning);
 
             double startTime = hitObjects[sliderIndex].StartTime;
-            retrieveDrawableSlider(sliderIndex);
+            addSeekStep(startTime);
+            retrieveDrawableSlider((Slider)hitObjects[sliderIndex]);
             setSnaking(true);
 
             ensureSnakingIn(startTime + fade_in_modifier);
@@ -93,7 +94,8 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddUntilStep("wait for track to start running", () => Beatmap.Value.Track.IsRunning);
 
             double startTime = hitObjects[sliderIndex].StartTime;
-            retrieveDrawableSlider(sliderIndex);
+            addSeekStep(startTime);
+            retrieveDrawableSlider((Slider)hitObjects[sliderIndex]);
             setSnaking(false);
 
             ensureNoSnakingIn(startTime + fade_in_modifier);
@@ -127,9 +129,8 @@ namespace osu.Game.Rulesets.Osu.Tests
             checkPositionChange(16600, sliderRepeat, positionDecreased);
         }
 
-        private void retrieveDrawableSlider(int index) =>
-            AddStep($"retrieve {(index + 1).ToOrdinalWords()} slider", () =>
-                slider = (DrawableSlider)Player.DrawableRuleset.Playfield.AllHitObjects.ElementAt(index));
+        private void retrieveDrawableSlider(Slider slider) => AddUntilStep($"retrieve slider @ {slider.StartTime}", () =>
+            (drawableSlider = (DrawableSlider)Player.DrawableRuleset.Playfield.AllHitObjects.SingleOrDefault(d => d.HitObject == slider)) != null);
 
         private void ensureSnakingIn(double startTime) => checkPositionChange(startTime, sliderEnd, positionIncreased);
         private void ensureNoSnakingIn(double startTime) => checkPositionChange(startTime, sliderEnd, positionRemainsSame);
@@ -150,13 +151,13 @@ namespace osu.Game.Rulesets.Osu.Tests
         private double timeAtRepeat(double startTime, int repeatIndex) => startTime + 100 + duration_of_span * repeatIndex;
         private Func<Vector2> positionAtRepeat(int repeatIndex) => repeatIndex % 2 == 0 ? (Func<Vector2>)sliderStart : sliderEnd;
 
-        private List<Vector2> sliderCurve => ((PlaySliderBody)slider.Body.Drawable).CurrentCurve;
+        private List<Vector2> sliderCurve => ((PlaySliderBody)drawableSlider.Body.Drawable).CurrentCurve;
         private Vector2 sliderStart() => sliderCurve.First();
         private Vector2 sliderEnd() => sliderCurve.Last();
 
         private Vector2 sliderRepeat()
         {
-            var drawable = Player.DrawableRuleset.Playfield.AllHitObjects.ElementAt(1);
+            var drawable = Player.DrawableRuleset.Playfield.AllHitObjects.SingleOrDefault(d => d.HitObject == hitObjects[1]);
             var repeat = drawable.ChildrenOfType<Container<DrawableSliderRepeat>>().First().Children.First();
             return repeat.Position;
         }

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

@@ -20,8 +20,8 @@ namespace osu.Game.Rulesets.Osu.Tests
 
         private TestDrawableSpinner drawableSpinner;
 
-        [TestCase(false)]
         [TestCase(true)]
+        [TestCase(false)]
         public void TestVariousSpinners(bool autoplay)
         {
             string term = autoplay ? "Hit" : "Miss";

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

@@ -0,0 +1,46 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Framework.Timing;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public class TestSceneSpinnerApplication : OsuTestScene
+    {
+        [Test]
+        public void TestApplyNewCircle()
+        {
+            DrawableSpinner dho = null;
+
+            AddStep("create spinner", () => Child = dho = new DrawableSpinner(prepareObject(new Spinner
+            {
+                Position = new Vector2(256, 192),
+                IndexInCurrentCombo = 0,
+                Duration = 0,
+            }))
+            {
+                Clock = new FramedClock(new StopwatchClock())
+            });
+
+            AddStep("apply new spinner", () => dho.Apply(prepareObject(new Spinner
+            {
+                Position = new Vector2(256, 192),
+                ComboIndex = 1,
+                Duration = 1000,
+            }), null));
+        }
+
+        private Spinner prepareObject(Spinner circle)
+        {
+            circle.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+            return circle;
+        }
+    }
+}

osu.Game.Rulesets.Osu/Configuration/OsuRulesetConfigManager.cs

@@ -3,6 +3,7 @@
 
 using osu.Game.Configuration;
 using osu.Game.Rulesets.Configuration;
+using osu.Game.Rulesets.UI;
 
 namespace osu.Game.Rulesets.Osu.Configuration
 {
@@ -19,6 +20,7 @@ namespace osu.Game.Rulesets.Osu.Configuration
             Set(OsuRulesetSetting.SnakingInSliders, true);
             Set(OsuRulesetSetting.SnakingOutSliders, true);
             Set(OsuRulesetSetting.ShowCursorTrail, true);
+            Set(OsuRulesetSetting.PlayfieldBorderStyle, PlayfieldBorderStyle.None);
         }
     }
 
@@ -26,6 +28,7 @@ namespace osu.Game.Rulesets.Osu.Configuration
     {
         SnakingInSliders,
         SnakingOutSliders,
-        ShowCursorTrail
+        ShowCursorTrail,
+        PlayfieldBorderStyle,
     }
 }

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

@@ -11,5 +11,6 @@ namespace osu.Game.Rulesets.Osu.Difficulty
         public double SpeedStrain;
         public double ApproachRate;
         public double OverallDifficulty;
+        public int HitCircleCount;
     }
 }

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

@@ -47,6 +47,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             // Add the ticks + tail of the slider. 1 is subtracted because the head circle would be counted twice (once for the slider itself in the line above)
             maxCombo += beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
 
+            int hitCirclesCount = beatmap.HitObjects.Count(h => h is HitCircle);
+
             return new OsuDifficultyAttributes
             {
                 StarRating = starRating,
@@ -56,6 +58,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
                 ApproachRate = preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5,
                 OverallDifficulty = (80 - hitWindowGreat) / 6,
                 MaxCombo = maxCombo,
+                HitCircleCount = hitCirclesCount,
                 Skills = skills
             };
         }

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

@@ -5,11 +5,9 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Extensions;
-using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Difficulty;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Mods;
-using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Scoring;
 
@@ -19,9 +17,6 @@ namespace osu.Game.Rulesets.Osu.Difficulty
     {
         public new OsuDifficultyAttributes Attributes => (OsuDifficultyAttributes)base.Attributes;
 
-        private readonly int countHitCircles;
-        private readonly int beatmapMaxCombo;
-
         private Mod[] mods;
 
         private double accuracy;
@@ -31,14 +26,9 @@ namespace osu.Game.Rulesets.Osu.Difficulty
         private int countMeh;
         private int countMiss;
 
-        public OsuPerformanceCalculator(Ruleset ruleset, WorkingBeatmap beatmap, ScoreInfo score)
-            : base(ruleset, beatmap, score)
+        public OsuPerformanceCalculator(Ruleset ruleset, DifficultyAttributes attributes, ScoreInfo score)
+            : base(ruleset, attributes, score)
         {
-            countHitCircles = Beatmap.HitObjects.Count(h => h is HitCircle);
-
-            beatmapMaxCombo = Beatmap.HitObjects.Count;
-            // Add the ticks + tail of the slider. 1 is subtracted because the "headcircle" would be counted twice (once for the slider itself in the line above)
-            beatmapMaxCombo += Beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
         }
 
         public override double Calculate(Dictionary<string, double> categoryRatings = null)
@@ -81,7 +71,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
                 categoryRatings.Add("Accuracy", accuracyValue);
                 categoryRatings.Add("OD", Attributes.OverallDifficulty);
                 categoryRatings.Add("AR", Attributes.ApproachRate);
-                categoryRatings.Add("Max Combo", beatmapMaxCombo);
+                categoryRatings.Add("Max Combo", Attributes.MaxCombo);
             }
 
             return totalValue;
@@ -106,8 +96,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             aimValue *= Math.Pow(0.97, countMiss);
 
             // Combo scaling
-            if (beatmapMaxCombo > 0)
-                aimValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(beatmapMaxCombo, 0.8), 1.0);
+            if (Attributes.MaxCombo > 0)
+                aimValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(Attributes.MaxCombo, 0.8), 1.0);
 
             double approachRateFactor = 1.0;
 
@@ -154,8 +144,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty
             speedValue *= Math.Pow(0.97, countMiss);
 
             // Combo scaling
-            if (beatmapMaxCombo > 0)
-                speedValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(beatmapMaxCombo, 0.8), 1.0);
+            if (Attributes.MaxCombo > 0)
+                speedValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(Attributes.MaxCombo, 0.8), 1.0);
 
             double approachRateFactor = 1.0;
             if (Attributes.ApproachRate > 10.33)
@@ -178,7 +168,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty
         {
             // This percentage only considers HitCircles of any value - in this part of the calculation we focus on hitting the timing hit window
             double betterAccuracyPercentage;
-            int amountHitObjectsWithAccuracy = countHitCircles;
+            int amountHitObjectsWithAccuracy = Attributes.HitCircleCount;
 
             if (amountHitObjectsWithAccuracy > 0)
                 betterAccuracyPercentage = ((countGreat - (totalHits - amountHitObjectsWithAccuracy)) * 6 + countOk * 2 + countMeh) / (double)(amountHitObjectsWithAccuracy * 6);

osu.Game.Rulesets.Osu/Edit/Blueprints/HitCircles/HitCirclePlacementBlueprint.cs

@@ -21,6 +21,12 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles
             InternalChild = circlePiece = new HitCirclePiece();
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            BeginPlacement();
+        }
+
         protected override void Update()
         {
             base.Update();

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

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
 using Humanizer;
+using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -18,6 +19,7 @@ using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Screens.Edit;
 using osuTK.Input;
 
 namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
@@ -105,7 +107,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             switch (action.ActionMethod)
             {
                 case PlatformActionMethod.Delete:
-                    return deleteSelected();
+                    return DeleteSelected();
             }
 
             return false;
@@ -126,7 +128,10 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             }
         }
 
-        private bool deleteSelected()
+        [Resolved(CanBeNull = true)]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        public bool DeleteSelected()
         {
             List<PathControlPoint> toRemove = Pieces.Where(p => p.IsSelected.Value).Select(p => p.ControlPoint).ToList();
 
@@ -134,7 +139,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             if (toRemove.Count == 0)
                 return false;
 
+            changeHandler?.BeginChange();
             RemoveControlPointsRequested?.Invoke(toRemove);
+            changeHandler?.EndChange();
 
             // Since pieces are re-used, they will not point to the deleted control points while remaining selected
             foreach (var piece in Pieces)
@@ -169,7 +176,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 
                 return new MenuItem[]
                 {
-                    new OsuMenuItem($"Delete {"control point".ToQuantity(count, count > 1 ? ShowQuantityAs.Numeric : ShowQuantityAs.None)}", MenuItemType.Destructive, () => deleteSelected()),
+                    new OsuMenuItem($"Delete {"control point".ToQuantity(count, count > 1 ? ShowQuantityAs.Numeric : ShowQuantityAs.None)}", MenuItemType.Destructive, () => DeleteSelected()),
                     new OsuMenuItem("Curve type")
                     {
                         Items = items

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

@@ -49,6 +49,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             OriginPosition = body.PathOffset;
         }
 
+        public void RecyclePath() => body.RecyclePath();
+
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => body.ReceivePositionalInputAt(screenSpacePos);
     }
 }

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

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
@@ -24,10 +25,12 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 {
     public class SliderSelectionBlueprint : OsuSelectionBlueprint<Slider>
     {
-        protected readonly SliderBodyPiece BodyPiece;
-        protected readonly SliderCircleSelectionBlueprint HeadBlueprint;
-        protected readonly SliderCircleSelectionBlueprint TailBlueprint;
-        protected readonly PathControlPointVisualiser ControlPointVisualiser;
+        protected SliderBodyPiece BodyPiece { get; private set; }
+        protected SliderCircleSelectionBlueprint HeadBlueprint { get; private set; }
+        protected SliderCircleSelectionBlueprint TailBlueprint { get; private set; }
+        protected PathControlPointVisualiser ControlPointVisualiser { get; private set; }
+
+        private readonly DrawableSlider slider;
 
         [Resolved(CanBeNull = true)]
         private HitObjectComposer composer { get; set; }
@@ -44,17 +47,17 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
         public SliderSelectionBlueprint(DrawableSlider slider)
             : base(slider)
         {
-            var sliderObject = (Slider)slider.HitObject;
+            this.slider = slider;
+        }
 
+        [BackgroundDependencyLoader]
+        private void load()
+        {
             InternalChildren = new Drawable[]
             {
                 BodyPiece = new SliderBodyPiece(),
                 HeadBlueprint = CreateCircleSelectionBlueprint(slider, SliderPosition.Start),
                 TailBlueprint = CreateCircleSelectionBlueprint(slider, SliderPosition.End),
-                ControlPointVisualiser = new PathControlPointVisualiser(sliderObject, true)
-                {
-                    RemoveControlPointsRequested = removeControlPoints
-                }
             };
         }
 
@@ -66,13 +69,47 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
             pathVersion = HitObject.Path.Version.GetBoundCopy();
             pathVersion.BindValueChanged(_ => updatePath());
+
+            BodyPiece.UpdateFrom(HitObject);
+        }
+
+        public override bool HandleQuickDeletion()
+        {
+            var hoveredControlPoint = ControlPointVisualiser?.Pieces.FirstOrDefault(p => p.IsHovered);
+
+            if (hoveredControlPoint == null)
+                return false;
+
+            hoveredControlPoint.IsSelected.Value = true;
+            ControlPointVisualiser.DeleteSelected();
+            return true;
         }
 
         protected override void Update()
         {
             base.Update();
 
-            BodyPiece.UpdateFrom(HitObject);
+            if (IsSelected)
+                BodyPiece.UpdateFrom(HitObject);
+        }
+
+        protected override void OnSelected()
+        {
+            AddInternal(ControlPointVisualiser = new PathControlPointVisualiser(slider.HitObject, true)
+            {
+                RemoveControlPointsRequested = removeControlPoints
+            });
+
+            base.OnSelected();
+        }
+
+        protected override void OnDeselected()
+        {
+            base.OnDeselected();
+
+            // throw away frame buffers on deselection.
+            ControlPointVisualiser?.Expire();
+            BodyPiece.RecyclePath();
         }
 
         private Vector2 rightClickPosition;
@@ -85,9 +122,14 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
                     rightClickPosition = e.MouseDownPosition;
                     return false; // Allow right click to be handled by context menu
 
-                case MouseButton.Left when e.ControlPressed && IsSelected:
-                    placementControlPointIndex = addControlPoint(e.MousePosition);
-                    return true; // Stop input from being handled and modifying the selection
+                case MouseButton.Left:
+                    if (e.ControlPressed && IsSelected)
+                    {
+                        placementControlPointIndex = addControlPoint(e.MousePosition);
+                        return true; // Stop input from being handled and modifying the selection
+                    }
+
+                    break;
             }
 
             return false;
@@ -182,7 +224,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
         private void updatePath()
         {
             HitObject.Path.ExpectedDistance.Value = composer?.GetSnappedDistanceFromDistance(HitObject.StartTime, (float)HitObject.Path.CalculatedDistance) ?? (float)HitObject.Path.CalculatedDistance;
-            editorBeatmap?.UpdateHitObject(HitObject);
+            editorBeatmap?.Update(HitObject);
         }
 
         public override MenuItem[] ContextMenuItems => new MenuItem[]
@@ -192,7 +234,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
         public override Vector2 ScreenSpaceSelectionPoint => BodyPiece.ToScreenSpace(BodyPiece.PathStartLocation);
 
-        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => BodyPiece.ReceivePositionalInputAt(screenSpacePos);
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
+            BodyPiece.ReceivePositionalInputAt(screenSpacePos) || ControlPointVisualiser?.Pieces.Any(p => p.ReceivePositionalInputAt(screenSpacePos)) == true;
 
         protected virtual SliderCircleSelectionBlueprint CreateCircleSelectionBlueprint(DrawableSlider slider, SliderPosition position) => new SliderCircleSelectionBlueprint(slider, position);
     }

osu.Game.Rulesets.Osu/Edit/DrawableOsuEditPool.cs

@@ -0,0 +1,63 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using osu.Framework.Graphics;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+
+namespace osu.Game.Rulesets.Osu.Edit
+{
+    public class DrawableOsuEditPool<T> : DrawableOsuPool<T>
+        where T : DrawableHitObject, new()
+    {
+        /// <summary>
+        /// Hit objects are intentionally made to fade out at a constant slower rate than in gameplay.
+        /// This allows a mapper to gain better historical context and use recent hitobjects as reference / snap points.
+        /// </summary>
+        private const double editor_hit_object_fade_out_extension = 700;
+
+        public DrawableOsuEditPool(Func<DrawableHitObject, double, bool> checkHittable, Action<Drawable> onLoaded, int initialSize, int? maximumSize = null)
+            : base(checkHittable, onLoaded, initialSize, maximumSize)
+        {
+        }
+
+        protected override T CreateNewDrawable() => base.CreateNewDrawable().With(d => d.ApplyCustomUpdateState += updateState);
+
+        private void updateState(DrawableHitObject hitObject, ArmedState state)
+        {
+            if (state == ArmedState.Idle)
+                return;
+
+            // adjust the visuals of certain object types to make them stay on screen for longer than usual.
+            switch (hitObject)
+            {
+                default:
+                    // there are quite a few drawable hit types we don't want to extend (spinners, ticks etc.)
+                    return;
+
+                case DrawableSlider _:
+                    // no specifics to sliders but let them fade slower below.
+                    break;
+
+                case DrawableHitCircle circle: // also handles slider heads
+                    circle.ApproachCircle
+                          .FadeOutFromOne(editor_hit_object_fade_out_extension)
+                          .Expire();
+                    break;
+            }
+
+            // Get the existing fade out transform
+            var existing = hitObject.Transforms.LastOrDefault(t => t.TargetMember == nameof(Alpha));
+
+            if (existing == null)
+                return;
+
+            hitObject.RemoveTransform(existing);
+
+            using (hitObject.BeginAbsoluteSequence(existing.StartTime))
+                hitObject.FadeOut(editor_hit_object_fade_out_extension).Expire();
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/DrawableOsuEditRuleset.cs

@@ -2,13 +2,9 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Linq;
-using osu.Framework.Graphics;
+using osu.Framework.Graphics.Pooling;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mods;
-using osu.Game.Rulesets.Objects.Drawables;
-using osu.Game.Rulesets.Osu.Objects;
-using osu.Game.Rulesets.Osu.Objects.Drawables;
 using osu.Game.Rulesets.Osu.UI;
 using osu.Game.Rulesets.UI;
 using osuTK;
@@ -17,62 +13,21 @@ namespace osu.Game.Rulesets.Osu.Edit
 {
     public class DrawableOsuEditRuleset : DrawableOsuRuleset
     {
-        /// <summary>
-        /// Hit objects are intentionally made to fade out at a constant slower rate than in gameplay.
-        /// This allows a mapper to gain better historical context and use recent hitobjects as reference / snap points.
-        /// </summary>
-        private const double editor_hit_object_fade_out_extension = 700;
-
         public DrawableOsuEditRuleset(Ruleset ruleset, IBeatmap beatmap, IReadOnlyList<Mod> mods)
             : base(ruleset, beatmap, mods)
         {
         }
 
-        public override DrawableHitObject<OsuHitObject> CreateDrawableRepresentation(OsuHitObject h)
-            => base.CreateDrawableRepresentation(h)?.With(d => d.ApplyCustomUpdateState += updateState);
-
-        private void updateState(DrawableHitObject hitObject, ArmedState state)
-        {
-            if (state == ArmedState.Idle)
-                return;
-
-            // adjust the visuals of certain object types to make them stay on screen for longer than usual.
-            switch (hitObject)
-            {
-                default:
-                    // there are quite a few drawable hit types we don't want to extent (spinners, ticks etc.)
-                    return;
-
-                case DrawableSlider _:
-                    // no specifics to sliders but let them fade slower below.
-                    break;
-
-                case DrawableHitCircle circle: // also handles slider heads
-                    circle.ApproachCircle
-                          .FadeOutFromOne(editor_hit_object_fade_out_extension)
-                          .Expire();
-                    break;
-            }
-
-            // Get the existing fade out transform
-            var existing = hitObject.Transforms.LastOrDefault(t => t.TargetMember == nameof(Alpha));
-
-            if (existing == null)
-                return;
-
-            hitObject.RemoveTransform(existing);
-
-            using (hitObject.BeginAbsoluteSequence(existing.StartTime))
-                hitObject.FadeOut(editor_hit_object_fade_out_extension).Expire();
-        }
-
-        protected override Playfield CreatePlayfield() => new OsuPlayfieldNoCursor();
+        protected override Playfield CreatePlayfield() => new OsuEditPlayfield();
 
         public override PlayfieldAdjustmentContainer CreatePlayfieldAdjustmentContainer() => new OsuPlayfieldAdjustmentContainer { Size = Vector2.One };
 
-        private class OsuPlayfieldNoCursor : OsuPlayfield
+        private class OsuEditPlayfield : OsuPlayfield
         {
             protected override GameplayCursorContainer CreateCursor() => null;
+
+            protected override DrawablePool<TDrawable> CreatePool<TDrawable>(int initialSize, int? maximumSize = null)
+                => new DrawableOsuEditPool<TDrawable>(CheckHittable, OnHitObjectLoaded, initialSize, maximumSize);
         }
     }
 }

osu.Game.Rulesets.Osu/Edit/OsuBlueprintContainer.cs

@@ -1,7 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System.Collections.Generic;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles;
@@ -14,8 +13,8 @@ namespace osu.Game.Rulesets.Osu.Edit
 {
     public class OsuBlueprintContainer : ComposeBlueprintContainer
     {
-        public OsuBlueprintContainer(IEnumerable<DrawableHitObject> drawableHitObjects)
-            : base(drawableHitObjects)
+        public OsuBlueprintContainer(HitObjectComposer composer)
+            : base(composer)
         {
         }
 

osu.Game.Rulesets.Osu/Edit/OsuHitObjectComposer.cs

@@ -16,7 +16,6 @@ using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
-using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.UI;
 using osu.Game.Screens.Edit.Components.TernaryButtons;
@@ -56,7 +55,18 @@ namespace osu.Game.Rulesets.Osu.Edit
         [BackgroundDependencyLoader]
         private void load()
         {
-            LayerBelowRuleset.Add(distanceSnapGridContainer = new Container { RelativeSizeAxes = Axes.Both });
+            LayerBelowRuleset.AddRange(new Drawable[]
+            {
+                new PlayfieldBorder
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    PlayfieldBorderStyle = { Value = PlayfieldBorderStyle.Corners }
+                },
+                distanceSnapGridContainer = new Container
+                {
+                    RelativeSizeAxes = Axes.Both
+                }
+            });
 
             selectedHitObjects = EditorBeatmap.SelectedHitObjects.GetBoundCopy();
             selectedHitObjects.CollectionChanged += (_, __) => updateDistanceSnapGrid();
@@ -69,8 +79,8 @@ namespace osu.Game.Rulesets.Osu.Edit
             updateDistanceSnapGrid();
         }
 
-        protected override ComposeBlueprintContainer CreateBlueprintContainer(IEnumerable<DrawableHitObject> hitObjects)
-            => new OsuBlueprintContainer(hitObjects);
+        protected override ComposeBlueprintContainer CreateBlueprintContainer()
+            => new OsuBlueprintContainer(this);
 
         private DistanceSnapGrid distanceSnapGrid;
         private Container distanceSnapGridContainer;

osu.Game.Rulesets.Osu/Edit/OsuSelectionHandler.cs

@@ -1,7 +1,14 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
+using System.Collections.Generic;
 using System.Linq;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Primitives;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Screens.Edit.Compose.Components;
 using osuTK;
@@ -10,40 +17,268 @@ namespace osu.Game.Rulesets.Osu.Edit
 {
     public class OsuSelectionHandler : SelectionHandler
     {
-        public override bool HandleMovement(MoveSelectionEvent moveEvent)
+        protected override void OnSelectionChanged()
         {
-            Vector2 minPosition = new Vector2(float.MaxValue, float.MaxValue);
-            Vector2 maxPosition = new Vector2(float.MinValue, float.MinValue);
+            base.OnSelectionChanged();
 
-            // Go through all hitobjects to make sure they would remain in the bounds of the editor after movement, before any movement is attempted
-            foreach (var h in SelectedHitObjects.OfType<OsuHitObject>())
+            Quad quad = selectedMovableObjects.Length > 0 ? getSurroundingQuad(selectedMovableObjects) : new Quad();
+
+            SelectionBox.CanRotate = quad.Width > 0 || quad.Height > 0;
+            SelectionBox.CanScaleX = quad.Width > 0;
+            SelectionBox.CanScaleY = quad.Height > 0;
+            SelectionBox.CanReverse = EditorBeatmap.SelectedHitObjects.Count > 1 || EditorBeatmap.SelectedHitObjects.Any(s => s is Slider);
+        }
+
+        protected override void OnOperationEnded()
+        {
+            base.OnOperationEnded();
+            referenceOrigin = null;
+        }
+
+        public override bool HandleMovement(MoveSelectionEvent moveEvent) =>
+            moveSelection(moveEvent.InstantDelta);
+
+        /// <summary>
+        /// During a transform, the initial origin is stored so it can be used throughout the operation.
+        /// </summary>
+        private Vector2? referenceOrigin;
+
+        public override bool HandleReverse()
+        {
+            var hitObjects = EditorBeatmap.SelectedHitObjects;
+
+            double endTime = hitObjects.Max(h => h.GetEndTime());
+            double startTime = hitObjects.Min(h => h.StartTime);
+
+            bool moreThanOneObject = hitObjects.Count > 1;
+
+            foreach (var h in hitObjects)
             {
-                if (h is Spinner)
+                if (moreThanOneObject)
+                    h.StartTime = endTime - (h.GetEndTime() - startTime);
+
+                if (h is Slider slider)
                 {
-                    // Spinners don't support position adjustments
-                    continue;
+                    var points = slider.Path.ControlPoints.ToArray();
+                    Vector2 endPos = points.Last().Position.Value;
+
+                    slider.Path.ControlPoints.Clear();
+
+                    slider.Position += endPos;
+
+                    PathType? lastType = null;
+
+                    for (var i = 0; i < points.Length; i++)
+                    {
+                        var p = points[i];
+                        p.Position.Value -= endPos;
+
+                        // propagate types forwards to last null type
+                        if (i == points.Length - 1)
+                            p.Type.Value = lastType;
+                        else if (p.Type.Value != null)
+                        {
+                            var newType = p.Type.Value;
+                            p.Type.Value = lastType;
+                            lastType = newType;
+                        }
+
+                        slider.Path.ControlPoints.Insert(0, p);
+                    }
                 }
-
-                // Stacking is not considered
-                minPosition = Vector2.ComponentMin(minPosition, Vector2.ComponentMin(h.EndPosition + moveEvent.InstantDelta, h.Position + moveEvent.InstantDelta));
-                maxPosition = Vector2.ComponentMax(maxPosition, Vector2.ComponentMax(h.EndPosition + moveEvent.InstantDelta, h.Position + moveEvent.InstantDelta));
-            }
-
-            if (minPosition.X < 0 || minPosition.Y < 0 || maxPosition.X > DrawWidth || maxPosition.Y > DrawHeight)
-                return false;
-
-            foreach (var h in SelectedHitObjects.OfType<OsuHitObject>())
-            {
-                if (h is Spinner)
-                {
-                    // Spinners don't support position adjustments
-                    continue;
-                }
-
-                h.Position += moveEvent.InstantDelta;
             }
 
             return true;
         }
+
+        public override bool HandleFlip(Direction direction)
+        {
+            var hitObjects = selectedMovableObjects;
+
+            var selectedObjectsQuad = getSurroundingQuad(hitObjects);
+            var centre = selectedObjectsQuad.Centre;
+
+            foreach (var h in hitObjects)
+            {
+                var pos = h.Position;
+
+                switch (direction)
+                {
+                    case Direction.Horizontal:
+                        pos.X = centre.X - (pos.X - centre.X);
+                        break;
+
+                    case Direction.Vertical:
+                        pos.Y = centre.Y - (pos.Y - centre.Y);
+                        break;
+                }
+
+                h.Position = pos;
+
+                if (h is Slider slider)
+                {
+                    foreach (var point in slider.Path.ControlPoints)
+                    {
+                        point.Position.Value = new Vector2(
+                            (direction == Direction.Horizontal ? -1 : 1) * point.Position.Value.X,
+                            (direction == Direction.Vertical ? -1 : 1) * point.Position.Value.Y
+                        );
+                    }
+                }
+            }
+
+            return true;
+        }
+
+        public override bool HandleScale(Vector2 scale, Anchor reference)
+        {
+            adjustScaleFromAnchor(ref scale, reference);
+
+            var hitObjects = selectedMovableObjects;
+
+            // for the time being, allow resizing of slider paths only if the slider is
+            // the only hit object selected. with a group selection, it's likely the user
+            // is not looking to change the duration of the slider but expand the whole pattern.
+            if (hitObjects.Length == 1 && hitObjects.First() is Slider slider)
+            {
+                Quad quad = getSurroundingQuad(slider.Path.ControlPoints.Select(p => p.Position.Value));
+                Vector2 pathRelativeDeltaScale = new Vector2(1 + scale.X / quad.Width, 1 + scale.Y / quad.Height);
+
+                foreach (var point in slider.Path.ControlPoints)
+                    point.Position.Value *= pathRelativeDeltaScale;
+            }
+            else
+            {
+                // move the selection before scaling if dragging from top or left anchors.
+                if ((reference & Anchor.x0) > 0 && !moveSelection(new Vector2(-scale.X, 0))) return false;
+                if ((reference & Anchor.y0) > 0 && !moveSelection(new Vector2(0, -scale.Y))) return false;
+
+                Quad quad = getSurroundingQuad(hitObjects);
+
+                foreach (var h in hitObjects)
+                {
+                    h.Position = new Vector2(
+                        quad.TopLeft.X + (h.X - quad.TopLeft.X) / quad.Width * (quad.Width + scale.X),
+                        quad.TopLeft.Y + (h.Y - quad.TopLeft.Y) / quad.Height * (quad.Height + scale.Y)
+                    );
+                }
+            }
+
+            return true;
+        }
+
+        private static void adjustScaleFromAnchor(ref Vector2 scale, Anchor reference)
+        {
+            // cancel out scale in axes we don't care about (based on which drag handle was used).
+            if ((reference & Anchor.x1) > 0) scale.X = 0;
+            if ((reference & Anchor.y1) > 0) scale.Y = 0;
+
+            // reverse the scale direction if dragging from top or left.
+            if ((reference & Anchor.x0) > 0) scale.X = -scale.X;
+            if ((reference & Anchor.y0) > 0) scale.Y = -scale.Y;
+        }
+
+        public override bool HandleRotation(float delta)
+        {
+            var hitObjects = selectedMovableObjects;
+
+            Quad quad = getSurroundingQuad(hitObjects);
+
+            referenceOrigin ??= quad.Centre;
+
+            foreach (var h in hitObjects)
+            {
+                h.Position = rotatePointAroundOrigin(h.Position, referenceOrigin.Value, delta);
+
+                if (h is IHasPath path)
+                {
+                    foreach (var point in path.Path.ControlPoints)
+                        point.Position.Value = rotatePointAroundOrigin(point.Position.Value, Vector2.Zero, delta);
+                }
+            }
+
+            // this isn't always the case but let's be lenient for now.
+            return true;
+        }
+
+        private bool moveSelection(Vector2 delta)
+        {
+            var hitObjects = selectedMovableObjects;
+
+            Quad quad = getSurroundingQuad(hitObjects);
+
+            if (quad.TopLeft.X + delta.X < 0 ||
+                quad.TopLeft.Y + delta.Y < 0 ||
+                quad.BottomRight.X + delta.X > DrawWidth ||
+                quad.BottomRight.Y + delta.Y > DrawHeight)
+                return false;
+
+            foreach (var h in hitObjects)
+                h.Position += delta;
+
+            return true;
+        }
+
+        /// <summary>
+        /// Returns a gamefield-space quad surrounding the provided hit objects.
+        /// </summary>
+        /// <param name="hitObjects">The hit objects to calculate a quad for.</param>
+        private Quad getSurroundingQuad(OsuHitObject[] hitObjects) =>
+            getSurroundingQuad(hitObjects.SelectMany(h => new[] { h.Position, h.EndPosition }));
+
+        /// <summary>
+        /// Returns a gamefield-space quad surrounding the provided points.
+        /// </summary>
+        /// <param name="points">The points to calculate a quad for.</param>
+        private Quad getSurroundingQuad(IEnumerable<Vector2> points)
+        {
+            if (!EditorBeatmap.SelectedHitObjects.Any())
+                return new Quad();
+
+            Vector2 minPosition = new Vector2(float.MaxValue, float.MaxValue);
+            Vector2 maxPosition = new Vector2(float.MinValue, float.MinValue);
+
+            // Go through all hitobjects to make sure they would remain in the bounds of the editor after movement, before any movement is attempted
+            foreach (var p in points)
+            {
+                minPosition = Vector2.ComponentMin(minPosition, p);
+                maxPosition = Vector2.ComponentMax(maxPosition, p);
+            }
+
+            Vector2 size = maxPosition - minPosition;
+
+            return new Quad(minPosition.X, minPosition.Y, size.X, size.Y);
+        }
+
+        /// <summary>
+        /// All osu! hitobjects which can be moved/rotated/scaled.
+        /// </summary>
+        private OsuHitObject[] selectedMovableObjects => EditorBeatmap.SelectedHitObjects
+                                                                      .OfType<OsuHitObject>()
+                                                                      .Where(h => !(h is Spinner))
+                                                                      .ToArray();
+
+        /// <summary>
+        /// Rotate a point around an arbitrary origin.
+        /// </summary>
+        /// <param name="point">The point.</param>
+        /// <param name="origin">The centre origin to rotate around.</param>
+        /// <param name="angle">The angle to rotate (in degrees).</param>
+        private static Vector2 rotatePointAroundOrigin(Vector2 point, Vector2 origin, float angle)
+        {
+            angle = -angle;
+
+            point.X -= origin.X;
+            point.Y -= origin.Y;
+
+            Vector2 ret;
+            ret.X = point.X * MathF.Cos(MathUtils.DegreesToRadians(angle)) + point.Y * MathF.Sin(MathUtils.DegreesToRadians(angle));
+            ret.Y = point.X * -MathF.Sin(MathUtils.DegreesToRadians(angle)) + point.Y * MathF.Cos(MathUtils.DegreesToRadians(angle));
+
+            ret.X += origin.X;
+            ret.Y += origin.Y;
+
+            return ret;
+        }
     }
 }

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

@@ -11,7 +11,6 @@ using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Replays;
 using osu.Game.Rulesets.UI;
-using osu.Game.Screens.Play;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
@@ -31,7 +30,7 @@ namespace osu.Game.Rulesets.Osu.Mods
 
         private OsuInputManager inputManager;
 
-        private GameplayClock gameplayClock;
+        private IFrameStableClock gameplayClock;
 
         private List<OsuReplayFrame> replayFrames;
 

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

@@ -64,8 +64,8 @@ namespace osu.Game.Rulesets.Osu.Mods
             /// </summary>
             private const float target_clamp = 1;
 
-            private readonly float targetBreakMultiplier = 0;
-            private readonly float easing = 1;
+            private readonly float targetBreakMultiplier;
+            private readonly float easing;
 
             private readonly CompositeDrawable restrictTo;
 
@@ -86,6 +86,9 @@ namespace osu.Game.Rulesets.Osu.Mods
             {
                 this.restrictTo = restrictTo;
                 this.beatmap = beatmap;
+
+                targetBreakMultiplier = 0;
+                easing = 1;
             }
 
             [BackgroundDependencyLoader]

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

@@ -23,23 +23,40 @@ namespace osu.Game.Rulesets.Osu.Mods
         private const double fade_in_duration_multiplier = 0.4;
         private const double fade_out_duration_multiplier = 0.3;
 
-        protected override bool IsFirstHideableObject(DrawableHitObject hitObject) => !(hitObject is DrawableSpinner);
+        protected override bool IsFirstAdjustableObject(HitObject hitObject) => !(hitObject is Spinner);
 
         public override void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
         {
-            static void adjustFadeIn(OsuHitObject h) => h.TimeFadeIn = h.TimePreempt * fade_in_duration_multiplier;
-
-            foreach (var d in drawables.OfType<DrawableOsuHitObject>())
-            {
-                adjustFadeIn(d.HitObject);
-                foreach (var h in d.HitObject.NestedHitObjects.OfType<OsuHitObject>())
-                    adjustFadeIn(h);
-            }
+            foreach (var d in drawables)
+                d.HitObjectApplied += applyFadeInAdjustment;
 
             base.ApplyToDrawableHitObjects(drawables);
         }
 
-        protected override void ApplyHiddenState(DrawableHitObject drawable, ArmedState state)
+        private void applyFadeInAdjustment(DrawableHitObject hitObject)
+        {
+            if (!(hitObject is DrawableOsuHitObject d))
+                return;
+
+            d.HitObject.TimeFadeIn = d.HitObject.TimePreempt * fade_in_duration_multiplier;
+
+            foreach (var nested in d.NestedHitObjects)
+                applyFadeInAdjustment(nested);
+        }
+
+        protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
+        {
+            base.ApplyIncreasedVisibilityState(hitObject, state);
+            applyState(hitObject, true);
+        }
+
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state)
+        {
+            base.ApplyNormalVisibilityState(hitObject, state);
+            applyState(hitObject, false);
+        }
+
+        private void applyState(DrawableHitObject drawable, bool increaseVisibility)
         {
             if (!(drawable is DrawableOsuHitObject d))
                 return;
@@ -54,18 +71,48 @@ namespace osu.Game.Rulesets.Osu.Mods
 
             switch (drawable)
             {
-                case DrawableHitCircle circle:
-                    // we don't want to see the approach circle
-                    using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
-                        circle.ApproachCircle.Hide();
+                case DrawableSliderTail sliderTail:
+                    // use stored values from head circle to achieve same fade sequence.
+                    var tailFadeOutParameters = getFadeOutParametersFromSliderHead(h);
 
-                    // fade out immediately after fade in.
-                    using (drawable.BeginAbsoluteSequence(fadeOutStartTime, true))
-                        circle.FadeOut(fadeOutDuration);
+                    using (drawable.BeginAbsoluteSequence(tailFadeOutParameters.startTime, true))
+                        sliderTail.FadeOut(tailFadeOutParameters.duration);
 
                     break;
 
+                case DrawableSliderRepeat sliderRepeat:
+                    // use stored values from head circle to achieve same fade sequence.
+                    var repeatFadeOutParameters = getFadeOutParametersFromSliderHead(h);
+
+                    using (drawable.BeginAbsoluteSequence(repeatFadeOutParameters.startTime, true))
+                        // only apply to circle piece – reverse arrow is not affected by hidden.
+                        sliderRepeat.CirclePiece.FadeOut(repeatFadeOutParameters.duration);
+
+                    break;
+
+                case DrawableHitCircle circle:
+                    Drawable fadeTarget = circle;
+
+                    if (increaseVisibility)
+                    {
+                        // only fade the circle piece (not the approach circle) for the increased visibility object.
+                        fadeTarget = circle.CirclePiece;
+                    }
+                    else
+                    {
+                        // we don't want to see the approach circle
+                        using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
+                            circle.ApproachCircle.Hide();
+                    }
+
+                    // fade out immediately after fade in.
+                    using (drawable.BeginAbsoluteSequence(fadeOutStartTime, true))
+                        fadeTarget.FadeOut(fadeOutDuration);
+                    break;
+
                 case DrawableSlider slider:
+                    associateNestedSliderCirclesWithHead(slider.HitObject);
+
                     using (slider.BeginAbsoluteSequence(fadeOutStartTime, true))
                         slider.Body.FadeOut(longFadeDuration, Easing.Out);
 
@@ -90,5 +137,24 @@ namespace osu.Game.Rulesets.Osu.Mods
                     break;
             }
         }
+
+        private readonly Dictionary<HitObject, SliderHeadCircle> correspondingSliderHeadForObject = new Dictionary<HitObject, SliderHeadCircle>();
+
+        private void associateNestedSliderCirclesWithHead(Slider slider)
+        {
+            var sliderHead = slider.NestedHitObjects.Single(obj => obj is SliderHeadCircle);
+
+            foreach (var nested in slider.NestedHitObjects)
+            {
+                if ((nested is SliderRepeat || nested is SliderEndCircle) && !correspondingSliderHeadForObject.ContainsKey(nested))
+                    correspondingSliderHeadForObject[nested] = (SliderHeadCircle)sliderHead;
+            }
+        }
+
+        private (double startTime, double duration) getFadeOutParametersFromSliderHead(OsuHitObject h)
+        {
+            var sliderHead = correspondingSliderHeadForObject[h];
+            return (sliderHead.StartTime - sliderHead.TimePreempt + sliderHead.TimeFadeIn, sliderHead.TimePreempt * fade_out_duration_multiplier);
+        }
     }
 }

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

@@ -2,11 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
-using osu.Game.Configuration;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects;
@@ -17,7 +14,7 @@ namespace osu.Game.Rulesets.Osu.Mods
     /// <summary>
     /// Adjusts the size of hit objects during their fade in animation.
     /// </summary>
-    public abstract class OsuModObjectScaleTween : Mod, IReadFromConfig, IApplicableToDrawableHitObjects
+    public abstract class OsuModObjectScaleTween : ModWithVisibilityAdjustment
     {
         public override ModType Type => ModType.Fun;
 
@@ -27,33 +24,19 @@ namespace osu.Game.Rulesets.Osu.Mods
 
         protected virtual float EndScale => 1;
 
-        private Bindable<bool> increaseFirstObjectVisibility = new Bindable<bool>();
-
         public override Type[] IncompatibleMods => new[] { typeof(OsuModSpinIn), typeof(OsuModTraceable) };
 
-        public void ReadFromConfig(OsuConfigManager config)
+        protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
         {
-            increaseFirstObjectVisibility = config.GetBindable<bool>(OsuSetting.IncreaseFirstObjectVisibility);
         }
 
-        public void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
-        {
-            foreach (var drawable in drawables.Skip(increaseFirstObjectVisibility.Value ? 1 : 0))
-            {
-                switch (drawable)
-                {
-                    case DrawableSpinner _:
-                        continue;
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state) => applyCustomState(hitObject, state);
 
-                    default:
-                        drawable.ApplyCustomUpdateState += ApplyCustomState;
-                        break;
-                }
-            }
-        }
-
-        protected virtual void ApplyCustomState(DrawableHitObject drawable, ArmedState state)
+        private void applyCustomState(DrawableHitObject drawable, ArmedState state)
         {
+            if (drawable is DrawableSpinner)
+                return;
+
             var h = (OsuHitObject)drawable.HitObject;
 
             // apply grow effect

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

@@ -2,12 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
-using osu.Game.Configuration;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects;
@@ -16,7 +12,7 @@ using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
-    public class OsuModSpinIn : Mod, IApplicableToDrawableHitObjects, IReadFromConfig
+    public class OsuModSpinIn : ModWithVisibilityAdjustment
     {
         public override string Name => "Spin In";
         public override string Acronym => "SI";
@@ -31,31 +27,17 @@ namespace osu.Game.Rulesets.Osu.Mods
         private const int rotate_offset = 360;
         private const float rotate_starting_width = 2;
 
-        private Bindable<bool> increaseFirstObjectVisibility = new Bindable<bool>();
-
-        public void ReadFromConfig(OsuConfigManager config)
+        protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
         {
-            increaseFirstObjectVisibility = config.GetBindable<bool>(OsuSetting.IncreaseFirstObjectVisibility);
         }
 
-        public void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
-        {
-            foreach (var drawable in drawables.Skip(increaseFirstObjectVisibility.Value ? 1 : 0))
-            {
-                switch (drawable)
-                {
-                    case DrawableSpinner _:
-                        continue;
-
-                    default:
-                        drawable.ApplyCustomUpdateState += applyZoomState;
-                        break;
-                }
-            }
-        }
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state) => applyZoomState(hitObject, state);
 
         private void applyZoomState(DrawableHitObject drawable, ArmedState state)
         {
+            if (drawable is DrawableSpinner)
+                return;
+
             var h = (OsuHitObject)drawable.HitObject;
 
             switch (drawable)

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

@@ -2,11 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.Linq;
-using osu.Framework.Bindables;
-using System.Collections.Generic;
 using osu.Framework.Extensions.Color4Extensions;
-using osu.Game.Configuration;
+using osu.Framework.Graphics;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
@@ -14,7 +11,7 @@ using osu.Game.Rulesets.Osu.Objects.Drawables.Pieces;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
-    internal class OsuModTraceable : Mod, IReadFromConfig, IApplicableToDrawableHitObjects
+    internal class OsuModTraceable : ModWithVisibilityAdjustment
     {
         public override string Name => "Traceable";
         public override string Acronym => "TC";
@@ -23,35 +20,34 @@ namespace osu.Game.Rulesets.Osu.Mods
         public override double ScoreMultiplier => 1;
 
         public override Type[] IncompatibleMods => new[] { typeof(OsuModHidden), typeof(OsuModSpinIn), typeof(OsuModObjectScaleTween) };
-        private Bindable<bool> increaseFirstObjectVisibility = new Bindable<bool>();
 
-        public void ReadFromConfig(OsuConfigManager config)
+        protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
         {
-            increaseFirstObjectVisibility = config.GetBindable<bool>(OsuSetting.IncreaseFirstObjectVisibility);
         }
 
-        public void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
-        {
-            foreach (var drawable in drawables.Skip(increaseFirstObjectVisibility.Value ? 1 : 0))
-                drawable.ApplyCustomUpdateState += ApplyTraceableState;
-        }
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state) => applyTraceableState(hitObject, state);
 
-        protected void ApplyTraceableState(DrawableHitObject drawable, ArmedState state)
+        private void applyTraceableState(DrawableHitObject drawable, ArmedState state)
         {
-            if (!(drawable is DrawableOsuHitObject drawableOsu))
+            if (!(drawable is DrawableOsuHitObject))
                 return;
 
-            var h = drawableOsu.HitObject;
-
             //todo: expose and hide spinner background somehow
 
             switch (drawable)
             {
                 case DrawableHitCircle circle:
                     // we only want to see the approach circle
-                    using (circle.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
-                        circle.CirclePiece.Hide();
+                    applyCirclePieceState(circle, circle.CirclePiece);
+                    break;
 
+                case DrawableSliderTail sliderTail:
+                    applyCirclePieceState(sliderTail);
+                    break;
+
+                case DrawableSliderRepeat sliderRepeat:
+                    // show only the repeat arrow
+                    applyCirclePieceState(sliderRepeat, sliderRepeat.CirclePiece);
                     break;
 
                 case DrawableSlider slider:
@@ -61,6 +57,13 @@ namespace osu.Game.Rulesets.Osu.Mods
             }
         }
 
+        private void applyCirclePieceState(DrawableOsuHitObject hitObject, IDrawable hitCircle = null)
+        {
+            var h = hitObject.HitObject;
+            using (hitObject.BeginAbsoluteSequence(h.StartTime - h.TimePreempt, true))
+                (hitCircle ?? hitObject).Hide();
+        }
+
         private void applySliderState(DrawableSlider slider)
         {
             ((PlaySliderBody)slider.Body.Drawable).AccentColour = slider.AccentColour.Value.Opacity(0);