Change editor grid slider adjustments to be relative to centre (#37737 )

As requested in https://github.com/ppy/osu/discussions/37734. Quick one, seems beneficial. --------- Co-authored-by: Bartłomiej Dach <dach.bartlomiej@gmail.com>
Update framework
2026-05-14 18:22:54 +08:00 · 2026-05-13 14:52:23 +02:00 · 2026-05-13 12:49:55 +09:00 · 2026-05-13 03:03:41 +09:00 · 2026-05-13 02:57:20 +09:00 · 2026-05-13 02:52:27 +09:00
405 changed files with 11432 additions and 2607 deletions
@@ -10,7 +10,7 @@
      "rollForward": false
    },
    "codefilesanity": {
-      "version": "0.0.37",
+      "version": "0.0.41",
      "commands": [
        "CodeFileSanity"
      ],
@@ -24,4 +24,4 @@
      "rollForward": false
    }
  }
-}
+}
@@ -50,7 +50,7 @@ jobs:
          exit $exit_code

      - name: InspectCode
-        uses: JetBrains/ReSharper-InspectCode@v0.11
+        uses: JetBrains/ReSharper-InspectCode@v0.12
        with:
          # this is WTF tier but if you don't specify *both* of these the defaults assume `build: true`
          build: false
@@ -101,14 +101,42 @@ jobs:
          NUnit.ConsoleOut=0

      # Attempt to upload results even if test fails.
-      # https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#always
+      # https://docs.github.com/en/actions/reference/workflows-and-actions/expressions#cancelled
      - name: Upload Test Results
        uses: actions/upload-artifact@v7
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
        with:
          name: osu-test-results-${{matrix.os.prettyname}}-${{matrix.threadingMode}}
          path: ${{github.workspace}}/TestResults/TestResults-${{matrix.os.prettyname}}-${{matrix.threadingMode}}.trx

+  test-results:
+    name: Test results
+    runs-on: ubuntu-latest
+    # we want to wait for the `test` job to complete, but run regardless of whether it succeeds or fails
+    # https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#example-not-requiring-successful-dependent-jobs
+    if: ${{ !cancelled() }}
+    needs: test
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Download results
+        uses: actions/download-artifact@v8
+        with:
+          pattern: osu-test-results-*
+          merge-multiple: true
+
+      - name: Add test results summary to workflow run
+        uses: dorny/test-reporter@v3.0.0
+        with:
+          name: Results
+          path: "*.trx"
+          reporter: dotnet-trx
+          list-suites: 'failed'
+          list-tests: 'failed'
+          use-actions-summary: 'true'
+
  build-only-android:
    name: Build only (Android)
    runs-on: windows-latest
@@ -1,45 +0,0 @@
-# This is a workaround to allow PRs to report their coverage. This will run inside the base repository.
-# See:
-#   * https://github.com/dorny/test-reporter#recommended-setup-for-public-repositories
-#   * https://docs.github.com/en/actions/reference/authentication-in-a-workflow#permissions-for-the-github_token
-name: Annotate CI run with test results
-on:
-  workflow_run:
-    workflows: [ "Continuous Integration" ]
-    types:
-      - completed
-
-permissions:
-  contents: read
-  actions: read
-  checks: write
-
-jobs:
-  annotate:
-    name: Annotate CI run with test results
-    runs-on: ubuntu-latest
-    if: ${{ github.event.workflow_run.conclusion != 'cancelled' }}
-    timeout-minutes: 5
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          repository: ${{ github.event.workflow_run.repository.full_name }}
-          ref: ${{ github.event.workflow_run.head_sha }}
-
-      - name: Download results
-        uses: actions/download-artifact@v8
-        with:
-          pattern: osu-test-results-*
-          merge-multiple: true
-          run-id: ${{ github.event.workflow_run.id }}
-          github-token: ${{ github.token }}
-
-      - name: Annotate CI run with test results
-        uses: dorny/test-reporter@v2.6.0
-        with:
-          name: Results
-          path: "*.trx"
-          reporter: dotnet-trx
-          list-suites: 'failed'
-          list-tests: 'failed'
@@ -13,6 +13,19 @@
            "preLaunchTask": "Build osu! (Debug)",
            "console": "internalConsole"
        },
+        {
+            "name": "osu! (Debug, Second Client)",
+            "type": "coreclr",
+            "request": "launch",
+            "program": "dotnet",
+            "args": [
+                "${workspaceRoot}/osu.Desktop/bin/Debug/net8.0/osu!.dll",
+                "--debug-client-id=1"
+            ],
+            "cwd": "${workspaceRoot}",
+            "preLaunchTask": "Build osu! (Debug)",
+            "console": "internalConsole"
+        },
        {
            "name": "osu! (Release)",
            "type": "coreclr",
@@ -2,6 +2,10 @@

 Thank you for showing interest in the development of osu!. We aim to provide a good collaborating environment for everyone involved, and as such have decided to list some of the most important things to keep in mind in the process. The guidelines below have been chosen based on past experience.

+## Foreword on AI usage
+
+Our team believes in **human contributions**. Any contribution – be it an issue report or a pull request – which is created by, documented by, or aided by AI/LLM usage will typically be **closed and locked without further discussion**.
+
 ## Table of contents

 1. [Reporting bugs](#reporting-bugs)
@@ -138,6 +138,8 @@ If you wish to help with localisation efforts, head over to [crowdin](https://cr

 We love to reward quality contributions. If you have made a large contribution, or are a regular contributor, you are welcome to [submit an expense via opencollective](https://opencollective.com/ppy/expenses/new). If you have any questions, feel free to [reach out to peppy](mailto:pe@ppy.sh) before doing so.

+Our team believes in **human contributions**. Any contribution – be it an issue report or a pull request – which is created by, documented by, or aided by AI/LLM usage will typically be **closed and locked without further discussion**.
+
 ## Licence

 *osu!*'s code and framework are licensed under the [MIT licence](https://opensource.org/licenses/MIT). Please see [the licence file](LICENCE) for more information. [tl;dr](https://tldrlegal.com/license/mit-license) you can do whatever you want as long as you include the original copyright and license notice in any copy of the software/source.
@@ -10,7 +10,7 @@
    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
  </PropertyGroup>
  <ItemGroup>
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2026.318.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2026.513.0" />
  </ItemGroup>
  <PropertyGroup>
    <!-- Fody does not handle Android build well, and warns when unchanged.
@@ -20,13 +20,24 @@ using Uri = Android.Net.Uri;
 namespace osu.Android
 {
    [Activity(ConfigurationChanges = DEFAULT_CONFIG_CHANGES, Exported = true, LaunchMode = DEFAULT_LAUNCH_MODE, MainLauncher = true)]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osz", DataHost = "*", DataMimeType = "*/*")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osk", DataHost = "*", DataMimeType = "*/*")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataPathPattern = ".*\\\\.osr", DataHost = "*", DataMimeType = "*/*")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-beatmap-archive")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-skin-archive")]
-    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, DataScheme = "content", DataMimeType = "application/x-osu-replay")]
-    [IntentFilter(new[] { Intent.ActionSend, Intent.ActionSendMultiple }, Categories = new[] { Intent.CategoryDefault }, DataMimeTypes = new[]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import beatmap", DataScheme = "content", DataPathPattern = ".*\\\\.osz", DataHost = "*",
+        DataMimeType = "*/*")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import skin", DataScheme = "content", DataPathPattern = ".*\\\\.osk", DataHost = "*",
+        DataMimeType = "*/*")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import replay", DataScheme = "content", DataPathPattern = ".*\\\\.osr", DataHost = "*",
+        DataMimeType = "*/*")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import beatmap", DataScheme = "content", DataMimeType = "application/x-osu-beatmap-archive")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import skin", DataScheme = "content", DataMimeType = "application/x-osu-skin-archive")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import replay", DataScheme = "content", DataMimeType = "application/x-osu-replay")]
+    [IntentFilter(new[] { Intent.ActionView }, Categories = new[] { Intent.CategoryDefault }, Label = "Import file", DataScheme = "content", DataMimeTypes = new[]
+    {
+        "application/zip",
+        "application/octet-stream",
+        "application/download",
+        "application/x-zip",
+        "application/x-zip-compressed",
+    })]
+    [IntentFilter(new[] { Intent.ActionSend, Intent.ActionSendMultiple }, Categories = new[] { Intent.CategoryDefault }, Label = "Import", DataMimeTypes = new[]
    {
        "application/zip",
        "application/octet-stream",
@@ -190,7 +190,7 @@ namespace osu.Desktop
            }

            // user party
-            if (!hideIdentifiableInformation && multiplayerClient.Room != null && multiplayerClient.Room.Settings.MatchType != MatchType.Matchmaking)
+            if (!hideIdentifiableInformation && multiplayerClient.Room != null && !multiplayerClient.Room.Settings.MatchType.IsMatchmakingType())
            {
                MultiplayerRoom room = multiplayerClient.Room;

@@ -0,0 +1,13 @@
+// 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 Newtonsoft.Json;
+
+namespace osu.Desktop.IPC.Messages
+{
+    public class HitCountMessage : OsuWebSocketMessage
+    {
+        [JsonProperty("new_hits")]
+        public long NewHits { get; init; }
+    }
+}
@@ -0,0 +1,19 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using Newtonsoft.Json;
+using osu.Framework.Extensions.TypeExtensions;
+
+namespace osu.Desktop.IPC.Messages
+{
+    public abstract class OsuWebSocketMessage
+    {
+        [JsonProperty("type")]
+        public string Type { get; }
+
+        protected OsuWebSocketMessage()
+        {
+            Type = GetType().ReadableName();
+        }
+    }
+}
@@ -0,0 +1,75 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using System.Threading;
+using osu.Desktop.IPC.Messages;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Logging;
+using osu.Game.Configuration;
+using osu.Game.IPC;
+using osu.Game.Online.Multiplayer;
+using osu.Game.Rulesets.Scoring;
+using osu.Game.Scoring;
+using JsonConvert = Newtonsoft.Json.JsonConvert;
+
+namespace osu.Desktop.IPC
+{
+    public partial class OsuWebSocketProvider : Component
+    {
+        private WebSocketServer? server;
+        private readonly Bindable<ScoreInfo> lastLocalScore = new Bindable<ScoreInfo>();
+
+        [BackgroundDependencyLoader]
+        private void load(SessionStatics sessionStatics)
+        {
+            server = new WebSocketServer(49727);
+            server.StartAsync().FireAndForget(onError: ex => Logger.Error(ex, "Failed to start websocket"));
+
+            sessionStatics.BindWith(Static.LastLocalUserScore, lastLocalScore);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            lastLocalScore.BindValueChanged(val =>
+            {
+                if (val.NewValue == null)
+                    return;
+
+                if (server?.IsRunning != true)
+                    return;
+
+                var msg = new HitCountMessage { NewHits = val.NewValue.Statistics.Where(kv => kv.Key.IsBasic() && kv.Key.IsHit()).Sum(kv => kv.Value) };
+                broadcast(msg);
+            });
+        }
+
+        private void broadcast(OsuWebSocketMessage message)
+        {
+            if (server?.IsRunning != true)
+                return;
+
+            string messageString = JsonConvert.SerializeObject(message);
+            server.BroadcastAsync(messageString).FireAndForget();
+        }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+
+            if (server?.IsRunning == true)
+            {
+                var cts = new CancellationTokenSource();
+                cts.CancelAfter(TimeSpan.FromSeconds(10));
+                server.StopAsync(cts.Token).WaitSafely();
+                server = null;
+            }
+        }
+    }
+}
@@ -6,6 +6,7 @@ using System.IO;
 using System.Reflection;
 using System.Runtime.Versioning;
 using Microsoft.Win32;
+using osu.Desktop.IPC;
 using osu.Desktop.Performance;
 using osu.Desktop.Security;
 using osu.Framework.Platform;
@@ -35,6 +36,8 @@ namespace osu.Desktop

        public bool IsFirstRun { get; init; }

+        public bool EnableWebSocketServer { get; init; }
+
        public OsuGameDesktop(string[]? args = null)
            : base(args)
        {
@@ -148,6 +151,9 @@ namespace osu.Desktop

            osuSchemeLinkIPCChannel = new OsuSchemeLinkIPCChannel(Host, this);
            archiveImportIPCChannel = new ArchiveImportIPCChannel(Host, this);
+
+            if (EnableWebSocketServer)
+                Add(new OsuWebSocketProvider());
        }

        public override void SetHost(GameHost host)
@@ -140,7 +140,8 @@ namespace osu.Desktop
                {
                    host.Run(new OsuGameDesktop(args)
                    {
-                        IsFirstRun = isFirstRun
+                        IsFirstRun = isFirstRun,
+                        EnableWebSocketServer = Environment.GetEnvironmentVariable("OSU_WEBSOCKET_SERVER") == "1",
                    });
                }
            }
@@ -25,7 +25,8 @@
  </ItemGroup>
  <ItemGroup Label="Package References">
    <PackageReference Include="System.IO.Packaging" Version="10.0.5" />
-    <PackageReference Include="DiscordRichPresence" Version="1.6.1.70" />
+    <!-- Held back due to invite bug in newer versions. See https://github.com/Lachee/discord-rpc-csharp/issues/286-->
+    <PackageReference Include="DiscordRichPresence" Version="1.5.0.51" />
    <PackageReference Include="Velopack" Version="0.0.1298" />
  </ItemGroup>
  <ItemGroup Label="Resources">
@@ -155,6 +155,7 @@ namespace osu.Game.Rulesets.Catch
                        new CatchModMuted(),
                        new CatchModNoScope(),
                        new CatchModMovingFast(),
+                        new CatchModSynesthesia(),
                    };

                case ModType.System:
@@ -18,6 +18,7 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
        private readonly Path drawablePath;

        private readonly List<(double Time, float X)> vertices = new List<(double, float)>();
+        private readonly List<Vector2> sliderVertices = new List<Vector2>();

        public ScrollingPath()
        {
@@ -47,9 +48,8 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
        private void computeTimeXs(JuiceStream hitObject)
        {
            vertices.Clear();
-
-            var sliderVertices = new List<Vector2>();
-            hitObject.Path.GetPathToProgress(sliderVertices, 0, 1);
+            sliderVertices.Clear();
+            sliderVertices.AddRange(hitObject.Path.CalculatedPath);

            if (sliderVertices.Count == 0)
                return;
@@ -14,6 +14,9 @@ namespace osu.Game.Rulesets.Catch.Edit
    {
        private readonly List<ICheck> checks = new List<ICheck>
        {
+            // Audio
+            new CheckCatchFewHitsounds(),
+
            // Compose
            new CheckBananaShowerGap(),
            new CheckConcurrentObjects(),
@@ -0,0 +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 osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Catch.Objects;
+
+namespace osu.Game.Rulesets.Catch.Edit.Checks
+{
+    public class CheckCatchFewHitsounds : CheckFewHitsounds
+    {
+        protected override bool IsExcludedFromHitsounding(HitObject hitObject) => hitObject is BananaShower;
+    }
+}
@@ -117,6 +117,15 @@ namespace osu.Game.Rulesets.Catch.Edit.Setup
            Beatmap.Difficulty.CircleSize = circleSizeSlider.Current.Value;
            Beatmap.Difficulty.DrainRate = healthDrainSlider.Current.Value;
            Beatmap.Difficulty.ApproachRate = approachRateSlider.Current.Value;
+            // in lazer catch, Overall Difficulty does *nothing* - as it should be in a sane world.
+            // in stable, it does *one extremely specific thing* which is influence the infamous `difficultyPeppyStars`
+            // which in turn affects score V1 (see `LegacyRulesetExtensions.CalculateDifficultyPeppyStars()`).
+            // there is a Ranking Criteria rule saying that Overall Difficulty and Approach Rate should match:
+            // https://osu.ppy.sh/wiki/en/Ranking_criteria/osu!catch
+            // the one case wherein that breaks stable is on some marathon maps;
+            // on those setting Overall Difficulty too high can lead to score V1 exceeding 32 bits ("score overflow").
+            // that case can be manually handled by mappers.
+            Beatmap.Difficulty.OverallDifficulty = approachRateSlider.Current.Value;
            Beatmap.Difficulty.SliderMultiplier = baseVelocitySlider.Current.Value;
            Beatmap.Difficulty.SliderTickRate = tickRateSlider.Current.Value;

@@ -0,0 +1,60 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Beatmaps;
+using osu.Game.Graphics;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Screens.Edit;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    /// <summary>
+    /// Mod that colours <see cref="HitObject"/>s based on the musical division they are on
+    /// </summary>
+    public class CatchModSynesthesia : ModSynesthesia, IApplicableToBeatmap, IApplicableToDrawableHitObject
+    {
+        private readonly OsuColour colours = new OsuColour();
+
+        private IBeatmap? currentBeatmap { get; set; }
+
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            //Store a reference to the current beatmap to look up the beat divisor when notes are drawn
+            if (currentBeatmap != beatmap)
+                currentBeatmap = beatmap;
+        }
+
+        public void ApplyToDrawableHitObject(DrawableHitObject d)
+        {
+            if (currentBeatmap == null) return;
+
+            Color4? timingBasedColour = null;
+
+            d.HitObjectApplied += _ =>
+            {
+                // Block bananas from getting coloured.
+                if (d.HitObject is not Banana)
+                {
+                    timingBasedColour = BindableBeatDivisor.GetColourFor(currentBeatmap.ControlPointInfo.GetClosestBeatDivisor(d.HitObject.StartTime), colours);
+                }
+
+                // Colour droplets into a solid colour, as droplets aren't generated snapped to timeline ticks.
+                if (d.HitObject is Droplet)
+                {
+                    timingBasedColour = Color4.LightGreen;
+                }
+            };
+
+            // Need to set this every update to ensure it doesn't get overwritten by DrawableHitObject.OnApply() -> UpdateComboColour().
+            d.OnUpdate += _ =>
+            {
+                if (timingBasedColour != null)
+                    d.AccentColour.Value = timingBasedColour.Value;
+            };
+        }
+    }
+}
@@ -175,8 +175,7 @@ namespace osu.Game.Rulesets.Catch.Objects
        /// </remarks>
        public void ConvertFromSliderPath(SliderPath sliderPath, double velocity)
        {
-            var sliderPathVertices = new List<Vector2>();
-            sliderPath.GetPathToProgress(sliderPathVertices, 0, 1);
+            var sliderPathVertices = sliderPath.CalculatedPath;

            double time = 0;

@@ -19,6 +19,7 @@
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\osu.Game.Rulesets.Mania\osu.Game.Rulesets.Mania.csproj" />
+    <ProjectReference Include="..\osu.Game.Tests\osu.Game.Tests.csproj" />
    <ProjectReference Include="..\osu.Game\osu.Game.csproj" />
  </ItemGroup>
 </Project>
@@ -13,6 +13,7 @@
    </Compile>
  </ItemGroup>
  <ItemGroup Label="Project References">
+    <ProjectReference Include="..\osu.Game.Tests\osu.Game.Tests.csproj" />
    <ProjectReference Include="..\osu.Game\osu.Game.csproj" />
    <ProjectReference Include="..\osu.Game.Rulesets.Mania\osu.Game.Rulesets.Mania.csproj" />
  </ItemGroup>
@@ -20,10 +20,10 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
        [Test]
        public void TestKeyCountChange()
        {
-            FormSliderBar<float> keyCount = null!;
+            FormSliderBar<int> keyCount = null!;

            AddStep("go to setup screen", () => InputManager.Key(Key.F4));
-            AddUntilStep("retrieve key count slider", () => keyCount = Editor.ChildrenOfType<SetupScreen>().Single().ChildrenOfType<FormSliderBar<float>>().First(), () => Is.Not.Null);
+            AddUntilStep("retrieve key count slider", () => keyCount = Editor.ChildrenOfType<SetupScreen>().Single().ChildrenOfType<FormSliderBar<int>>().First(), () => Is.Not.Null);
            AddAssert("key count is 5", () => keyCount.Current.Value, () => Is.EqualTo(5));
            AddStep("change key count to 8", () =>
            {
@@ -31,7 +31,7 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
            });
            AddUntilStep("dialog visible", () => Game.ChildrenOfType<IDialogOverlay>().SingleOrDefault()?.CurrentDialog, Is.InstanceOf<SaveAndReloadEditorDialog>);
            AddStep("refuse", () => InputManager.Key(Key.Number2));
-            AddAssert("key count is 5", () => keyCount.Current.Value, () => Is.EqualTo(5));
+            AddUntilStep("key count is 5", () => keyCount.Current.Value, () => Is.EqualTo(5));

            AddStep("change key count to 8 again", () =>
            {
@@ -41,5 +41,32 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
            AddStep("acquiesce", () => InputManager.Key(Key.Number1));
            AddUntilStep("beatmap became 8K", () => Game.Beatmap.Value.BeatmapInfo.Difficulty.CircleSize, () => Is.EqualTo(8));
        }
+
+        [Test]
+        public void TestDualStagesChange()
+        {
+            FormCheckBox dualStages = null!;
+            FormSliderBar<int> keyCount = null!;
+
+            AddStep("go to setup screen", () => InputManager.Key(Key.F4));
+            AddUntilStep("retrieve dual stages checkbox", () => dualStages = Editor.ChildrenOfType<SetupScreen>().Single().ChildrenOfType<FormCheckBox>().First(), () => Is.Not.Null);
+            AddUntilStep("retrieve key count slider", () => keyCount = Editor.ChildrenOfType<SetupScreen>().Single().ChildrenOfType<FormSliderBar<int>>().First(), () => Is.Not.Null);
+            AddAssert("key count is 5", () => keyCount.Current.Value, () => Is.EqualTo(5));
+            AddStep("set dual stages", () =>
+            {
+                dualStages.Current.Value = true;
+            });
+            AddUntilStep("dialog visible", () => Game.ChildrenOfType<IDialogOverlay>().SingleOrDefault()?.CurrentDialog, Is.InstanceOf<SaveAndReloadEditorDialog>);
+            AddStep("refuse", () => InputManager.Key(Key.Number2));
+            AddUntilStep("key count is 5", () => keyCount.Current.Value, () => Is.EqualTo(5));
+
+            AddStep("set dual stages again", () =>
+            {
+                dualStages.Current.Value = true;
+            });
+            AddUntilStep("dialog visible", () => Game.ChildrenOfType<IDialogOverlay>().Single().CurrentDialog, Is.InstanceOf<SaveAndReloadEditorDialog>);
+            AddStep("acquiesce", () => InputManager.Key(Key.Number1));
+            AddUntilStep("beatmap became 12K", () => Game.Beatmap.Value.BeatmapInfo.Difficulty.CircleSize, () => Is.EqualTo(12));
+        }
    }
 }
@@ -57,6 +57,28 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
            AddAssert("time is unchanged", () => EditorClock.CurrentTime, () => Is.EqualTo(initialTime));
        }

+        [Test]
+        public void TestNoTwoObjectsAtSameTimeAndColumn()
+        {
+            AddStep("change seek setting to false", () => config.SetValue(OsuSetting.EditorAutoSeekOnPlacement, false));
+            AddStep("clear beatmap", () => EditorBeatmap.Clear());
+
+            AddStep("select note placement tool", () => InputManager.Key(Key.Number2));
+            AddStep("move mouse to centre of last column", () => InputManager.MoveMouseTo(this.ChildrenOfType<Column>().Last().ScreenSpaceDrawQuad.Centre));
+            AddStep("place note", () => InputManager.Click(MouseButton.Left));
+            AddAssert("beatmap has 1 object", () => EditorBeatmap.HitObjects, () => Has.Count.EqualTo(1));
+
+            AddStep("select note placement tool", () => InputManager.Key(Key.Number2));
+            AddStep("move mouse to centre of first column", () => InputManager.MoveMouseTo(this.ChildrenOfType<Column>().First().ScreenSpaceDrawQuad.Centre));
+            AddStep("place note", () => InputManager.Click(MouseButton.Left));
+            AddAssert("beatmap has 2 objects", () => EditorBeatmap.HitObjects, () => Has.Count.EqualTo(2));
+
+            AddStep("select note placement tool", () => InputManager.Key(Key.Number2));
+            AddStep("move mouse to centre of last column", () => InputManager.MoveMouseTo(this.ChildrenOfType<Column>().Last().ScreenSpaceDrawQuad.Centre));
+            AddStep("place note", () => InputManager.Click(MouseButton.Left));
+            AddAssert("beatmap has 2 objects", () => EditorBeatmap.HitObjects, () => Has.Count.EqualTo(2));
+        }
+
        private void placeObject()
        {
            AddStep("select note placement tool", () => InputManager.Key(Key.Number2));
@@ -27,6 +27,24 @@ namespace osu.Game.Rulesets.Mania.Tests
        [TestCase("100374")]
        [TestCase("1450162")]
        [TestCase("4869637")]
+        [TestCase("1K")]
+        [TestCase("2K")]
+        [TestCase("3K")]
+        [TestCase("4K")]
+        [TestCase("5K")]
+        [TestCase("6K")]
+        [TestCase("7K")]
+        [TestCase("8K")]
+        [TestCase("9K")]
+        [TestCase("10K")]
+        // [TestCase("11K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("12K")]
+        // [TestCase("13K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("14K")]
+        // [TestCase("15K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("16K")]
+        // [TestCase("17K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("18K")]
        public void Test(string name) => base.Test(name);

        protected override IEnumerable<ConvertValue> CreateConvertValue(HitObject hitObject)
@@ -0,0 +1,45 @@
+// 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.IO.Stores;
+using static osu.Game.Tests.Beatmaps.Formats.LegacyBeatmapEncoderTest;
+
+namespace osu.Game.Rulesets.Mania.Tests
+{
+    [TestFixture]
+    public class ManiaLegacyBeatmapEncoderTest
+    {
+        private static readonly DllResourceStore beatmaps_resource_store = new DllResourceStore(typeof(ManiaLegacyBeatmapEncoderTest).Assembly);
+
+        [TestCase("1K")]
+        [TestCase("2K")]
+        [TestCase("3K")]
+        [TestCase("4K")]
+        [TestCase("5K")]
+        [TestCase("6K")]
+        [TestCase("7K")]
+        [TestCase("8K")]
+        [TestCase("9K")]
+        [TestCase("10K")]
+        // [TestCase("11K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("12K")]
+        // [TestCase("13K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("14K")]
+        // [TestCase("15K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("16K")]
+        // [TestCase("17K")] <- See comment in `ManiaBeatmapConverter` ctor for disable reason.
+        [TestCase("18K")]
+        [TestCase("7K+1")]
+        public void TestEncodeDecodeStability(string name)
+        {
+            var decoded = DecodeFromLegacy(beatmaps_resource_store.GetStream($"Resources/Testing/Beatmaps/{name}.osu"), beatmaps_resource_store, name);
+            var decodedAfterEncode = DecodeFromLegacy(EncodeToLegacy(decoded), beatmaps_resource_store, name);
+
+            Sort(decoded.beatmap);
+            Sort(decodedAfterEncode.beatmap);
+
+            CompareBeatmaps(decoded, decodedAfterEncode);
+        }
+    }
+}
@@ -25,6 +25,8 @@ namespace osu.Game.Rulesets.Mania.Tests.Mods
 {
    public partial class TestSceneManiaModNoRelease : RateAdjustedBeatmapTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        private const double time_before_head = 250;
        private const double time_head = 1500;
        private const double time_during_hold_1 = 2500;
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]}]}
@@ -0,0 +1,46 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:10K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:10
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+25,192,0,1,0,0:0:0:0:
+76,192,125,1,0,0:0:0:0:
+128,192,250,1,0,0:0:0:0:
+179,192,375,1,0,0:0:0:0:
+230,192,500,1,0,0:0:0:0:
+281,192,625,1,0,0:0:0:0:
+332,192,750,1,0,0:0:0:0:
+384,192,875,1,0,0:0:0:0:
+435,192,1000,1,0,0:0:0:0:
+486,192,1125,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]},{"RandomW":273326509,"RandomX":531,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1250.0,"Objects":[{"StartTime":1250.0,"EndTime":1250.0,"Column":10}]}]}
@@ -0,0 +1,47 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:11K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:11
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+23,192,0,1,0,0:0:0:0:
+69,192,125,1,0,0:0:0:0:
+116,192,250,1,0,0:0:0:0:
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+349,192,875,1,0,0:0:0:0:
+395,192,1000,1,0,0:0:0:0:
+442,192,1125,1,0,0:0:0:0:
+488,192,1250,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1250.0,"Objects":[{"StartTime":1250.0,"EndTime":1250.0,"Column":10}]},{"RandomW":273326509,"RandomX":551,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1375.0,"Objects":[{"StartTime":1375.0,"EndTime":1375.0,"Column":11}]}]}
@@ -0,0 +1,48 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:12K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:12
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+21,192,0,1,0,0:0:0:0:
+64,192,125,1,0,0:0:0:0:
+106,192,250,1,0,0:0:0:0:
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+448,192,1250,1,0,0:0:0:0:
+490,192,1375,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1250.0,"Objects":[{"StartTime":1250.0,"EndTime":1250.0,"Column":10}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1375.0,"Objects":[{"StartTime":1375.0,"EndTime":1375.0,"Column":11}]},{"RandomW":273326509,"RandomX":571,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1500.0,"Objects":[{"StartTime":1500.0,"EndTime":1500.0,"Column":12}]}]}
@@ -0,0 +1,49 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:13K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:13
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+19,192,0,1,0,0:0:0:0:
+59,192,125,1,0,0:0:0:0:
+98,192,250,1,0,0:0:0:0:
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+452,192,1375,1,0,0:0:0:0:
+492,192,1500,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1250.0,"Objects":[{"StartTime":1250.0,"EndTime":1250.0,"Column":10}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1375.0,"Objects":[{"StartTime":1375.0,"EndTime":1375.0,"Column":11}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1500.0,"Objects":[{"StartTime":1500.0,"EndTime":1500.0,"Column":12}]},{"RandomW":273326509,"RandomX":591,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1625.0,"Objects":[{"StartTime":1625.0,"EndTime":1625.0,"Column":13}]}]}
@@ -0,0 +1,50 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:14K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:14
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+18,192,0,1,0,0:0:0:0:
+54,192,125,1,0,0:0:0:0:
+91,192,250,1,0,0:0:0:0:
+128,192,375,1,0,0:0:0:0:
+164,192,500,1,0,0:0:0:0:
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+{"Mappings":[{"RandomW":273326509,"RandomX":391,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":391,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":391,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":391,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]}]}
@@ -0,0 +1,40 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:4K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:4
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+64,192,0,1,0,0:0:0:0:
+192,192,125,1,0,0:0:0:0:
+320,192,250,1,0,0:0:0:0:
+448,192,375,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":411,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":411,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":411,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":411,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":411,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]}]}
@@ -0,0 +1,41 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:5K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:5
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+51,192,0,1,0,0:0:0:0:
+153,192,125,1,0,0:0:0:0:
+256,192,250,1,0,0:0:0:0:
+358,192,375,1,0,0:0:0:0:
+460,192,500,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":431,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]}]}
@@ -0,0 +1,42 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:6K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:6
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+42,192,0,1,0,0:0:0:0:
+128,192,125,1,0,0:0:0:0:
+213,192,250,1,0,0:0:0:0:
+298,192,375,1,0,0:0:0:0:
+384,192,500,1,0,0:0:0:0:
+469,192,625,1,0,0:0:0:0:
@@ -0,0 +1,45 @@
+osu file format v14
+
+[General]
+Mode: 3
+SpecialStyle:1
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:8K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:8
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+32,192,0,1,0,0:0:0:0:
+96,192,125,1,0,0:0:0:0:
+160,192,250,1,0,0:0:0:0:
+224,192,375,1,0,0:0:0:0:
+288,192,500,1,0,0:0:0:0:
+352,192,625,1,0,0:0:0:0:
+416,192,750,1,0,0:0:0:0:
+480,192,875,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":451,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]}]}
@@ -0,0 +1,43 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:7K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:7
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+36,192,0,1,0,0:0:0:0:
+109,192,125,1,0,0:0:0:0:
+182,192,250,1,0,0:0:0:0:
+256,192,375,1,0,0:0:0:0:
+329,192,500,1,0,0:0:0:0:
+402,192,625,1,0,0:0:0:0:
+475,192,750,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":471,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]}]}
@@ -0,0 +1,44 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:8K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:8
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+32,192,0,1,0,0:0:0:0:
+96,192,125,1,0,0:0:0:0:
+160,192,250,1,0,0:0:0:0:
+224,192,375,1,0,0:0:0:0:
+288,192,500,1,0,0:0:0:0:
+352,192,625,1,0,0:0:0:0:
+416,192,750,1,0,0:0:0:0:
+480,192,875,1,0,0:0:0:0:
@@ -0,0 +1 @@
+{"Mappings":[{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":491,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]}]}
@@ -0,0 +1,45 @@
+osu file format v14
+
+[General]
+Mode: 3
+
+[Metadata]
+Title:keycount test
+TitleUnicode:keycount test
+Artist:mania
+ArtistUnicode:mania
+Creator:spaceman_atlas
+Version:9K
+
+[Difficulty]
+HPDrainRate:5
+CircleSize:9
+OverallDifficulty:5
+ApproachRate:5
+SliderMultiplier:1.4
+SliderTickRate:1
+
+[Events]
+//Background and Video events
+//Break Periods
+//Storyboard Layer 0 (Background)
+//Storyboard Layer 1 (Fail)
+//Storyboard Layer 2 (Pass)
+//Storyboard Layer 3 (Foreground)
+//Storyboard Layer 4 (Overlay)
+//Storyboard Sound Samples
+
+[TimingPoints]
+0,500,4,2,0,100,1,0
+
+
+[HitObjects]
+28,192,0,1,0,0:0:0:0:
+85,192,125,1,0,0:0:0:0:
+142,192,250,1,0,0:0:0:0:
+199,192,375,1,0,0:0:0:0:
+256,192,500,1,0,0:0:0:0:
+312,192,625,1,0,0:0:0:0:
+369,192,750,1,0,0:0:0:0:
+426,192,875,1,0,0:0:0:0:
+483,192,1000,1,0,0:0:0:0:
@@ -33,6 +33,8 @@ namespace osu.Game.Rulesets.Mania.Tests
    /// </summary>
    public partial class TestSceneHoldNoteInput : RateAdjustedBeatmapTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        private const double time_before_head = 250;
        private const double time_head = 1500;
        private const double time_during_hold_1 = 2500;
@@ -21,6 +21,8 @@ namespace osu.Game.Rulesets.Mania.Tests
 {
    public partial class TestSceneMaximumScore : RateAdjustedBeatmapTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        private ScoreAccessibleReplayPlayer currentPlayer = null!;

        private List<JudgementResult> judgementResults = new List<JudgementResult>();
@@ -26,6 +26,8 @@ namespace osu.Game.Rulesets.Mania.Tests
 {
    public partial class TestSceneOutOfOrderHits : RateAdjustedBeatmapTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        [Test]
        public void TestPreviousHitWindowDoesNotExtendPastNextObject()
        {
@@ -20,6 +20,8 @@ namespace osu.Game.Rulesets.Mania.Tests
 {
    public partial class TestSceneReplayRewinding : RateAdjustedBeatmapTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        private ReplayPlayer currentPlayer = null!;

        [Test]
@@ -26,6 +26,8 @@ namespace osu.Game.Rulesets.Mania.Tests
    [TestFixture]
    public partial class TestSceneTimingBasedNoteColouring : OsuTestScene
    {
+        protected override Ruleset CreateRuleset() => new ManiaRuleset();
+
        private Bindable<bool> configTimingBasedNoteColouring;

        private ManualClock clock;
@@ -11,5 +11,6 @@
  </PropertyGroup>
  <ItemGroup Label="Project References">
    <ProjectReference Include="..\osu.Game.Rulesets.Mania\osu.Game.Rulesets.Mania.csproj" />
+    <ProjectReference Include="..\osu.Game.Tests\osu.Game.Tests.csproj" />
  </ItemGroup>
 </Project>
@@ -66,6 +66,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps

            if (IsForCurrentRuleset && TargetColumns > ManiaRuleset.MAX_STAGE_KEYS)
            {
+                // If support for odd key counts above 10 (11 / 13 / 15 / 17K) is ever desired, this code needs to go.
+                // For now, it's probably fine, as stable doesn't support them outside of manual .osu edits either.
                TargetColumns /= 2;
                Dual = true;
            }
@@ -44,7 +44,7 @@ namespace osu.Game.Rulesets.Mania.Edit

        protected override void Update()
        {
-            TimeRange.Value = TimelineTimeRange == null || ShowSpeedChanges.Value ? ComputeScrollTime(Config.Get<double>(ManiaRulesetSetting.ScrollSpeed)) : TimelineTimeRange.Value;
+            TargetTimeRange = TimelineTimeRange == null || ShowSpeedChanges.Value ? ComputeScrollTime(Config.Get<double>(ManiaRulesetSetting.ScrollSpeed)) : TimelineTimeRange.Value;
            base.Update();
        }
    }
@@ -7,6 +7,7 @@ using osu.Framework.Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Localisation;
 using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Formats;
 using osu.Game.Graphics.UserInterfaceV2;
 using osu.Game.Localisation;
 using osu.Game.Resources.Localisation.Web;
@@ -19,13 +20,22 @@ namespace osu.Game.Rulesets.Mania.Edit.Setup
    {
        public override LocalisableString Title => EditorSetupStrings.DifficultyHeader;

-        private FormSliderBar<float> keyCountSlider { get; set; } = null!;
+        private FormSliderBar<int> keyCountSlider { get; set; } = null!;
+        private FormCheckBox dualStages { get; set; } = null!;
        private FormCheckBox specialStyle { get; set; } = null!;
        private FormSliderBar<float> healthDrainSlider { get; set; } = null!;
        private FormSliderBar<float> overallDifficultySlider { get; set; } = null!;
        private FormSliderBar<double> baseVelocitySlider { get; set; } = null!;
        private FormSliderBar<double> tickRateSlider { get; set; } = null!;

+        private readonly BindableInt singleStageKeyCount = new BindableInt
+        {
+            Default = (int)BeatmapDifficulty.DEFAULT_DIFFICULTY,
+            Precision = 1,
+        };
+
+        private readonly BindableInt actualKeyCount = new BindableInt();
+
        [Resolved]
        private Editor? editor { get; set; }

@@ -37,20 +47,19 @@ namespace osu.Game.Rulesets.Mania.Edit.Setup
        {
            Children = new Drawable[]
            {
-                keyCountSlider = new FormSliderBar<float>
+                keyCountSlider = new FormSliderBar<int>
                {
                    Caption = BeatmapsetsStrings.ShowStatsCsMania,
                    HintText = "The number of columns in the beatmap",
-                    Current = new BindableFloat(Beatmap.Difficulty.CircleSize)
-                    {
-                        Default = BeatmapDifficulty.DEFAULT_DIFFICULTY,
-                        MinValue = 0,
-                        MaxValue = 10,
-                        Precision = 1,
-                    },
+                    Current = singleStageKeyCount,
                    TransferValueOnCommit = true,
                    TabbableContentContainer = this,
                },
+                dualStages = new FormCheckBox
+                {
+                    Caption = "Dual stages",
+                    HintText = "Doubles the number of keys by adding a second stage."
+                },
                specialStyle = new FormCheckBox
                {
                    Caption = "Use special (N+1) style",
@@ -117,16 +126,54 @@ namespace osu.Game.Rulesets.Mania.Edit.Setup
                },
            };

-            keyCountSlider.Current.BindValueChanged(updateKeyCount);
+            setStateFromActualKeyCount((int)Beatmap.Difficulty.CircleSize);
+
+            keyCountSlider.Current.BindValueChanged(_ => calculateActualKeyCount());
+            dualStages.Current.BindValueChanged(_ =>
+            {
+                updateSingleStageKeyCountBounds();
+                calculateActualKeyCount();
+            });
+            actualKeyCount.BindValueChanged(updateKeyCount);
+
            healthDrainSlider.Current.BindValueChanged(_ => updateValues());
            overallDifficultySlider.Current.BindValueChanged(_ => updateValues());
            baseVelocitySlider.Current.BindValueChanged(_ => updateValues());
            tickRateSlider.Current.BindValueChanged(_ => updateValues());
        }

+        private void updateSingleStageKeyCountBounds()
+        {
+            singleStageKeyCount.MinValue = dualStages.Current.Value ? ManiaRuleset.MAX_STAGE_KEYS / 2 + 1 : 1;
+            singleStageKeyCount.MaxValue = dualStages.Current.Value ? LegacyBeatmapDecoder.MAX_MANIA_KEY_COUNT / 2 : ManiaRuleset.MAX_STAGE_KEYS;
+        }
+
+        private void setStateFromActualKeyCount(int keyCount)
+        {
+            actualKeyCount.Value = keyCount;
+
+            if (keyCount > 10)
+            {
+                dualStages.Current.Value = true;
+                singleStageKeyCount.Value = keyCount / 2;
+            }
+            else
+            {
+                dualStages.Current.Value = false;
+                singleStageKeyCount.Value = keyCount;
+            }
+
+            updateSingleStageKeyCountBounds();
+        }
+
+        private void calculateActualKeyCount()
+        {
+            actualKeyCount.Value = keyCountSlider.Current.Value * (dualStages.Current.Value ? 2 : 1);
+        }
+
        private bool updatingKeyCount;

-        private void updateKeyCount(ValueChangedEvent<float> keyCount)
+        private void updateKeyCount(ValueChangedEvent<int> keyCount)
        {
            if (updatingKeyCount) return;

@@ -143,7 +190,8 @@ namespace osu.Game.Rulesets.Mania.Edit.Setup
                    Schedule(() =>
                    {
                        changeHandler!.RestoreState(-1);
-                        Beatmap.Difficulty.CircleSize = keyCountSlider.Current.Value = keyCount.OldValue;
+                        Beatmap.Difficulty.CircleSize = keyCount.OldValue;
+                        setStateFromActualKeyCount(keyCount.OldValue);
                        updatingKeyCount = false;
                    });
                }
@@ -158,7 +206,7 @@ namespace osu.Game.Rulesets.Mania.Edit.Setup
        {
            // for now, update these on commit rather than making BeatmapMetadata bindables.
            // after switching database engines we can reconsider if switching to bindables is a good direction.
-            Beatmap.Difficulty.CircleSize = keyCountSlider.Current.Value;
+            Beatmap.Difficulty.CircleSize = actualKeyCount.Value;
            Beatmap.SpecialStyle = specialStyle.Current.Value;
            Beatmap.Difficulty.DrainRate = healthDrainSlider.Current.Value;
            Beatmap.Difficulty.OverallDifficulty = overallDifficultySlider.Current.Value;
@@ -98,9 +98,9 @@ namespace osu.Game.Rulesets.Mania
            return false;
        }

-        public bool FilterMayChangeFromMods(ValueChangedEvent<IReadOnlyList<Mod>> mods)
+        public bool FilterMayChangeFromMods(FilterCriteria criteria, ValueChangedEvent<IReadOnlyList<Mod>> mods)
        {
-            if (includedKeyCounts.Count != LegacyBeatmapDecoder.MAX_MANIA_KEY_COUNT)
+            if (includedKeyCounts.Count != LegacyBeatmapDecoder.MAX_MANIA_KEY_COUNT || criteria.Group == GroupMode.Variant)
            {
                // Interpreting as the Mod type is required for equality comparison.
                HashSet<Mod> oldSet = mods.OldValue.OfType<ManiaKeyMod>().AsEnumerable<Mod>().ToHashSet();
@@ -327,6 +327,8 @@ namespace osu.Game.Rulesets.Mania

        public override RulesetSettingsSubsection CreateSettings() => new ManiaSettingsSubsection(this);

+        public override LocalisableString VariantDescription => "Keys";
+
        public override IEnumerable<int> AvailableVariants
        {
            get
@@ -483,6 +485,22 @@ namespace osu.Game.Rulesets.Mania
            };
        }

+        public override IEnumerable<RulesetBeatmapAttribute> GetBeatmapAttributesForRankedPlayCard(IBeatmapInfo beatmapInfo, IReadOnlyCollection<Mod> mods)
+        {
+            var attributes = GetBeatmapAttributesForDisplay(beatmapInfo, mods).ToList();
+
+            // Key count attribute isn't relevant to ranked play (it's decided by the pool).
+            attributes.RemoveAll(a => a.Acronym == "KC");
+
+            float holdNoteRatio = beatmapInfo.TotalObjectCount == 0 ? 0 : (float)beatmapInfo.EndTimeObjectCount / beatmapInfo.TotalObjectCount;
+            attributes.Insert(0, new RulesetBeatmapAttribute("Hold notes", @"HN", holdNoteRatio, holdNoteRatio, 1)
+            {
+                ValueFormat = "P0"
+            });
+
+            return attributes;
+        }
+
        public override IRulesetFilterCriteria CreateRulesetFilterCriteria()
        {
            return new ManiaFilterCriteria();
@@ -498,6 +516,9 @@ namespace osu.Game.Rulesets.Mania

        public int GetKeyCount(IBeatmapInfo beatmapInfo, IReadOnlyList<Mod>? mods = null)
            => ManiaBeatmapConverter.GetColumnCount(LegacyBeatmapConversionDifficultyInfo.FromBeatmapInfo(beatmapInfo), mods);
+
+        public override int GetVariantForBeatmap(IBeatmapInfo beatmapInfo, IReadOnlyList<Mod>? mods = null)
+            => GetKeyCount(beatmapInfo, mods);
    }

    public enum PlayfieldType
@@ -73,6 +73,12 @@ namespace osu.Game.Rulesets.Osu.Tests.Editor

            AddStep("end slider placement", () => InputManager.Click(MouseButton.Right));

+            AddStep("seek to slider end", () =>
+            {
+                var slider = (Slider)EditorBeatmap.HitObjects.Single();
+                EditorClock.Seek(slider.EndTime);
+            });
+
            AddStep("enter circle placement mode", () => InputManager.Key(Key.Number2));

            AddStep("move mouse slightly", () => InputManager.MoveMouseTo(playfield.ScreenSpaceDrawQuad.Centre + new Vector2(playfield.ScreenSpaceDrawQuad.Width * 0.205f, 0)));
@@ -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.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Game.Graphics;
@@ -57,11 +56,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
            if (lastVersion != hitObject.Path.Version.Value)
            {
                lastVersion = hitObject.Path.Version.Value;
-
-                var vertices = new List<Vector2>();
-                hitObject.Path.GetPathToProgress(vertices, 0, 1);
-
-                body.SetVertices(vertices);
+                body.SetVertices(hitObject.Path.CalculatedPath);
            }

            OriginPosition = body.PathOffset;
@@ -0,0 +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 osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Objects;
+
+namespace osu.Game.Rulesets.Osu.Edit.Checks
+{
+    public class CheckOsuFewHitsounds : CheckFewHitsounds
+    {
+        protected override bool IsExcludedFromHitsounding(HitObject hitObject) => hitObject is Spinner;
+    }
+}
@@ -3,6 +3,7 @@

 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Osu.Edit.Blueprints;
@@ -22,7 +23,7 @@ namespace osu.Game.Rulesets.Osu.Edit
                          """;
        }

-        public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.Solid.DraftingCompass };
+        public override Drawable CreateIcon() => new SpriteIcon { Icon = OsuIcon.EditorGrid };

        public override PlacementBlueprint CreatePlacementBlueprint() => new GridPlacementBlueprint();
    }
@@ -2,7 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.

 using osu.Framework.Graphics;
-using osu.Game.Beatmaps;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles;
@@ -17,7 +18,7 @@ namespace osu.Game.Rulesets.Osu.Edit
        {
        }

-        public override Drawable CreateIcon() => new BeatmapStatisticIcon(BeatmapStatisticsIconType.Circles);
+        public override Drawable CreateIcon() => new SpriteIcon { Icon = OsuIcon.EditorHitCircle };

        public override HitObjectPlacementBlueprint CreatePlacementBlueprint() => new HitCirclePlacementBlueprint();
    }
@@ -14,6 +14,9 @@ namespace osu.Game.Rulesets.Osu.Edit
    {
        private readonly List<ICheck> checks = new List<ICheck>
        {
+            // Audio
+            new CheckOsuFewHitsounds(),
+
            // Compose
            new CheckOffscreenObjects(),
            new CheckTooShortSpinners(),
@@ -125,13 +125,23 @@ namespace osu.Game.Rulesets.Osu.Edit
            {
                startPositionXSlider = new ExpandableSlider<float>
                {
-                    Current = StartPositionX,
+                    Current = new BindableFloat
+                    {
+                        MinValue = -OsuPlayfield.BASE_SIZE.X / 2,
+                        MaxValue = OsuPlayfield.BASE_SIZE.X / 2,
+                        Precision = 0.1f,
+                    },
                    KeyboardStep = 1,
                    ExpandedLabelText = "X offset",
                },
                startPositionYSlider = new ExpandableSlider<float>
                {
-                    Current = StartPositionY,
+                    Current = new BindableFloat
+                    {
+                        MinValue = -OsuPlayfield.BASE_SIZE.Y / 2,
+                        MaxValue = OsuPlayfield.BASE_SIZE.Y / 2,
+                        Precision = 0.1f,
+                    },
                    KeyboardStep = 1,
                    ExpandedLabelText = "Y offset",
                },
@@ -186,15 +196,27 @@ namespace osu.Game.Rulesets.Osu.Edit
            StartPositionX.BindValueChanged(x =>
            {
                startPositionXSlider.ContractedLabelText = $"X: {x.NewValue:#,0.##}";
+                startPositionXSlider.Current.Value = x.NewValue - OsuPlayfield.BASE_SIZE.X / 2;
                StartPosition.Value = new Vector2(x.NewValue, StartPosition.Value.Y);
            }, true);

            StartPositionY.BindValueChanged(y =>
            {
                startPositionYSlider.ContractedLabelText = $"Y: {y.NewValue:#,0.##}";
+                startPositionYSlider.Current.Value = y.NewValue - OsuPlayfield.BASE_SIZE.Y / 2;
                StartPosition.Value = new Vector2(StartPosition.Value.X, y.NewValue);
            }, true);

+            startPositionXSlider.Current.BindValueChanged(x =>
+            {
+                StartPositionX.Value = x.NewValue + OsuPlayfield.BASE_SIZE.X / 2;
+            });
+
+            startPositionYSlider.Current.BindValueChanged(y =>
+            {
+                StartPositionY.Value = y.NewValue + OsuPlayfield.BASE_SIZE.Y / 2;
+            });
+
            StartPosition.BindValueChanged(pos =>
            {
                StartPositionX.Value = pos.NewValue.X;
@@ -2,7 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.

 using osu.Framework.Graphics;
-using osu.Game.Beatmaps;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders;
@@ -24,7 +25,7 @@ namespace osu.Game.Rulesets.Osu.Edit
                """;
        }

-        public override Drawable CreateIcon() => new BeatmapStatisticIcon(BeatmapStatisticsIconType.Sliders);
+        public override Drawable CreateIcon() => new SpriteIcon { Icon = OsuIcon.EditorSlider };

        public override HitObjectPlacementBlueprint CreatePlacementBlueprint() => new SliderPlacementBlueprint();
    }
@@ -2,7 +2,8 @@
 // See the LICENCE file in the repository root for full licence text.

 using osu.Framework.Graphics;
-using osu.Game.Beatmaps;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.Spinners;
@@ -17,7 +18,7 @@ namespace osu.Game.Rulesets.Osu.Edit
        {
        }

-        public override Drawable CreateIcon() => new BeatmapStatisticIcon(BeatmapStatisticsIconType.Spinners);
+        public override Drawable CreateIcon() => new SpriteIcon { Icon = OsuIcon.EditorSpinner };

        public override HitObjectPlacementBlueprint CreatePlacementBlueprint() => new SpinnerPlacementBlueprint();
    }
@@ -21,7 +21,7 @@ using osuTK.Graphics;

 namespace osu.Game.Rulesets.Osu.Mods
 {
-    public partial class OsuModBlinds : Mod, IApplicableToDrawableRuleset<OsuHitObject>, IApplicableToHealthProcessor
+    public partial class OsuModBlinds : ModBlinds, IApplicableToDrawableRuleset<OsuHitObject>, IApplicableToHealthProcessor
    {
        public override string Name => "Blinds";
        public override LocalisableString Description => "Play with blinds on your screen.";
@@ -16,7 +16,7 @@ using osu.Game.Rulesets.Osu.Skinning.Default;

 namespace osu.Game.Rulesets.Osu.Mods
 {
-    public class OsuModTraceable : ModWithVisibilityAdjustment, IRequiresApproachCircles
+    public class OsuModTraceable : ModTraceable, IRequiresApproachCircles
    {
        public override string Name => "Traceable";
        public override string Acronym => "TC";
@@ -141,6 +141,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
        /// </summary>
        public void MissForcefully() => ApplyMinResult();

+        // ReSharper disable once FunctionRecursiveOnAllPaths (TODO: remove after fixed https://youtrack.jetbrains.com/issue/RIDER-135036/Incorrect-recursive-on-all-execution-paths-inspection)
        private RectangleF parentScreenSpaceRectangle => ((DrawableOsuHitObject)ParentHitObject)?.parentScreenSpaceRectangle ?? Parent!.ScreenSpaceDrawQuad.AABBFloat;

        /// <summary>
@@ -9,12 +9,12 @@ namespace osu.Game.Rulesets.Osu.Skinning.Default
    public partial class TrianglesPiece : Triangles
    {
        protected override bool CreateNewTriangles => false;
-        protected override float SpawnRatio => 0.5f;

        public TrianglesPiece(int? seed = null)
            : base(seed)
        {
            TriangleScale = 1.2f;
+            SpawnRatio = 0.5f;
            HideAlphaDiscrepancies = false;
            ClampAxes = Axes.None;
        }
@@ -105,7 +105,8 @@ namespace osu.Game.Rulesets.Osu.Skinning
                return;

            // Generate the entire curve
-            drawableSlider.HitObject.Path.GetPathToProgress(CurrentCurve, 0, 1);
+            CurrentCurve.Clear();
+            CurrentCurve.AddRange(drawableSlider.HitObject.Path.CalculatedPath);
            SetVertices(CurrentCurve);

            // Force the body to be the final path size to avoid excessive autosize computations
@@ -265,9 +265,6 @@ namespace osu.Game.Rulesets.Osu.Utils
        /// </remarks>
        public static RectangleF CalculatePossibleMovementBounds(Slider slider)
        {
-            var pathPositions = new List<Vector2>();
-            slider.Path.GetPathToProgress(pathPositions, 0, 1);
-
            float minX = float.PositiveInfinity;
            float maxX = float.NegativeInfinity;

@@ -275,7 +272,7 @@ namespace osu.Game.Rulesets.Osu.Utils
            float maxY = float.NegativeInfinity;

            // Compute the bounding box of the slider.
-            foreach (var pos in pathPositions)
+            foreach (var pos in slider.Path.CalculatedPath)
            {
                minX = MathF.Min(minX, pos.X);
                maxX = MathF.Max(maxX, pos.X);
@@ -18,11 +18,13 @@ namespace osu.Game.Rulesets.Taiko.Configuration
            base.InitialiseDefaults();

            SetDefault(TaikoRulesetSetting.TouchControlScheme, TaikoTouchControlScheme.KDDK);
+            SetDefault(TaikoRulesetSetting.RateAdjustedHitAnimation, true);
        }
    }

    public enum TaikoRulesetSetting
    {
-        TouchControlScheme
+        TouchControlScheme,
+        RateAdjustedHitAnimation,
    }
 }
@@ -7,12 +7,15 @@ using System;
 using System.Diagnostics;
 using System.Linq;
 using JetBrains.Annotations;
+using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Input.Events;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Scoring;
+using osu.Game.Rulesets.Taiko.Configuration;
 using osu.Game.Rulesets.Taiko.Skinning.Default;
+using osu.Game.Screens.Play;
 using osu.Game.Skinning;
 using osuTK;

@@ -34,12 +37,15 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
            private set;
        }

-        private bool validActionPressed;
-
-        private double? lastPressHandleTime;
+        [Resolved(CanBeNull = true)]
+        private TaikoRulesetConfigManager taikoConfig { get; set; }

+        private readonly Bindable<bool> rateAdjustedHitAnimations = new Bindable<bool>(true);
        private readonly Bindable<HitType> type = new Bindable<HitType>();

+        private bool validActionPressed;
+        private double? lastPressHandleTime;
+
        public DrawableHit()
            : this(null)
        {
@@ -51,6 +57,12 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
            FillMode = FillMode.Fit;
        }

+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            taikoConfig?.BindWith(TaikoRulesetSetting.RateAdjustedHitAnimation, rateAdjustedHitAnimations);
+        }
+
        protected override void OnApply()
        {
            type.BindTo(HitObject.TypeBindable);
@@ -168,11 +180,15 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
                    if (SnapJudgementLocation)
                        MainPiece.MoveToX(-X);

-                    this.ScaleTo(0.8f, gravity_time * 2, Easing.OutQuad);
+                    // Rate independent to match stable.
+                    double rate = Math.Abs((Clock as IGameplayClock)?.GetTrueGameplayRate() ?? Clock.Rate);
+                    double length = gravity_time * (rateAdjustedHitAnimations.Value ? 1 : rate);

-                    this.MoveToY(-gravity_travel_height, gravity_time, Easing.Out)
+                    this.ScaleTo(0.8f, length * 2, Easing.OutQuad);
+
+                    this.MoveToY(-gravity_travel_height, length, Easing.Out)
                        .Then()
-                        .MoveToY(gravity_travel_height * 2, gravity_time * 2, Easing.In);
+                        .MoveToY(gravity_travel_height * 2, length * 2, Easing.In);

                    this.FadeOut(800);
                    break;
@@ -3,6 +3,7 @@

 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Localisation;
 using osu.Game.Graphics.UserInterfaceV2;
 using osu.Game.Localisation;
@@ -31,7 +32,16 @@ namespace osu.Game.Rulesets.Taiko
                {
                    Caption = RulesetSettingsStrings.TouchControlScheme,
                    Current = config.GetBindable<TaikoTouchControlScheme>(TaikoRulesetSetting.TouchControlScheme)
+                }),
+                new SettingsItemV2(new FormCheckBox
+                {
+                    Caption = RulesetSettingsStrings.RateAdjustedHitAnimation,
+                    HintText = RulesetSettingsStrings.RateAdjustedHitAnimationTooltip,
+                    Current = config.GetBindable<bool>(TaikoRulesetSetting.RateAdjustedHitAnimation)
                })
+                {
+                    ApplyClassicDefault = c => ((IHasCurrentValue<bool>)c).Current.Value = false,
+                }
            };
        }
    }
@@ -46,11 +46,11 @@ namespace osu.Game.Tests.Beatmaps.Formats
        {
            const string name = "Resources/storyboard_only_video.osu";

-            var decoded = decodeFromLegacy(beatmaps_resource_store.GetStream(name), name);
+            var decoded = DecodeFromLegacy(beatmaps_resource_store.GetStream(name), beatmaps_resource_store, name);
            Assert.That(decoded.beatmap.UnhandledEventLines.Count, Is.EqualTo(1));
            Assert.That(decoded.beatmap.UnhandledEventLines.Single(), Is.EqualTo("Video,0,\"video.avi\""));

-            var memoryStream = encodeToLegacy(decoded);
+            var memoryStream = EncodeToLegacy(decoded);

            var storyboard = new LegacyStoryboardDecoder().Decode(new LineBufferedReader(memoryStream));
            StoryboardLayer video = storyboard.Layers.Single(l => l.Name == "Video");
@@ -60,42 +60,42 @@ namespace osu.Game.Tests.Beatmaps.Formats
        [TestCaseSource(nameof(allBeatmaps))]
        public void TestEncodeDecodeStability(string name)
        {
-            var decoded = decodeFromLegacy(beatmaps_resource_store.GetStream(name), name);
-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy(decoded), name);
+            var decoded = DecodeFromLegacy(beatmaps_resource_store.GetStream(name), beatmaps_resource_store, name);
+            var decodedAfterEncode = DecodeFromLegacy(EncodeToLegacy(decoded), beatmaps_resource_store, name);

-            sort(decoded.beatmap);
-            sort(decodedAfterEncode.beatmap);
+            Sort(decoded.beatmap);
+            Sort(decodedAfterEncode.beatmap);

-            compareBeatmaps(decoded, decodedAfterEncode);
+            CompareBeatmaps(decoded, decodedAfterEncode);
        }

        [TestCaseSource(nameof(allBeatmaps))]
        public void TestEncodeDecodeStabilityDoubleConvert(string name)
        {
-            var decoded = decodeFromLegacy(beatmaps_resource_store.GetStream(name), name);
-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy(decoded), name);
+            var decoded = DecodeFromLegacy(beatmaps_resource_store.GetStream(name), beatmaps_resource_store, name);
+            var decodedAfterEncode = DecodeFromLegacy(EncodeToLegacy(decoded), beatmaps_resource_store, name);

            // run an extra convert. this is expected to be stable.
            decodedAfterEncode.beatmap = convert(decodedAfterEncode.beatmap);

-            sort(decoded.beatmap);
-            sort(decodedAfterEncode.beatmap);
+            Sort(decoded.beatmap);
+            Sort(decodedAfterEncode.beatmap);

-            compareBeatmaps(decoded, decodedAfterEncode);
+            CompareBeatmaps(decoded, decodedAfterEncode);
        }

        [TestCaseSource(nameof(allBeatmaps))]
        public void TestEncodeDecodeStabilityWithNonLegacyControlPoints(string name)
        {
-            var decoded = decodeFromLegacy(beatmaps_resource_store.GetStream(name), name);
+            var decoded = DecodeFromLegacy(beatmaps_resource_store.GetStream(name), beatmaps_resource_store, name);

            // we are testing that the transfer of relevant data to hitobjects (from legacy control points) sticks through encode/decode.
            // before the encode step, the legacy information is removed here.
            decoded.beatmap.ControlPointInfo = removeLegacyControlPointTypes(decoded.beatmap.ControlPointInfo);

-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy(decoded), name);
+            var decodedAfterEncode = DecodeFromLegacy(EncodeToLegacy(decoded), beatmaps_resource_store, name);

-            compareBeatmaps(decoded, decodedAfterEncode);
+            CompareBeatmaps(decoded, decodedAfterEncode);

            static ControlPointInfo removeLegacyControlPointTypes(ControlPointInfo controlPointInfo)
            {
@@ -120,7 +120,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
            }
        }

-        private void compareBeatmaps((IBeatmap beatmap, TestLegacySkin skin) expected, (IBeatmap beatmap, TestLegacySkin skin) actual)
+        public static void CompareBeatmaps((IBeatmap beatmap, TestLegacySkin skin) expected, (IBeatmap beatmap, TestLegacySkin skin) actual)
        {
            // Check all control points that are still considered to be at a global level.
            Assert.That(actual.beatmap.ControlPointInfo.TimingPoints.Serialize(), Is.EqualTo(expected.beatmap.ControlPointInfo.TimingPoints.Serialize()));
@@ -153,7 +153,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                }
            };

-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty))), string.Empty);
+            var encoded = EncodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty)));
+            var decodedAfterEncode = DecodeFromLegacy(encoded, beatmaps_resource_store, string.Empty);
            var decodedSlider = (Slider)decodedAfterEncode.beatmap.HitObjects[0];
            Assert.That(decodedSlider.Path.ControlPoints.Count, Is.EqualTo(4));
            Assert.That(decodedSlider.Path.ControlPoints[0].Type, Is.EqualTo(PathType.BSpline(3)));
@@ -182,7 +183,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                }
            };

-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty))), string.Empty);
+            var encoded = EncodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty)));
+            var decodedAfterEncode = DecodeFromLegacy(encoded, beatmaps_resource_store, string.Empty);
            var decodedSlider = (Slider)decodedAfterEncode.beatmap.HitObjects[0];
            Assert.That(decodedSlider.Path.ControlPoints.Count, Is.EqualTo(5));
        }
@@ -209,7 +211,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                }
            };

-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy((new Beatmap(), beatmapSkin)), string.Empty);
+            var encoded = EncodeToLegacy((new Beatmap(), beatmapSkin));
+            var decodedAfterEncode = DecodeFromLegacy(encoded, beatmaps_resource_store, string.Empty);
            Assert.That(decodedAfterEncode.skin.Configuration.CustomComboColours, Has.Count.EqualTo(8));
        }

@@ -231,8 +234,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                HitObjects = { originalSlider }
            };

-            var encoded = encodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty)));
-            var decodedAfterEncode = decodeFromLegacy(encoded, string.Empty, version: LegacyBeatmapEncoder.FIRST_LAZER_VERSION);
+            var encoded = EncodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty)));
+            var decodedAfterEncode = DecodeFromLegacy(encoded, beatmaps_resource_store, string.Empty, version: LegacyBeatmapEncoder.FIRST_LAZER_VERSION);
            var decodedSlider = (Slider)decodedAfterEncode.beatmap.HitObjects[0];
            Assert.That(decodedSlider.Path.ControlPoints.Select(p => p.Position),
                Is.EquivalentTo(originalSlider.Path.ControlPoints.Select(p => p.Position)));
@@ -251,7 +254,8 @@ namespace osu.Game.Tests.Beatmaps.Formats
                }
            };

-            var decodedAfterEncode = decodeFromLegacy(encodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty))), string.Empty);
+            var encoded = EncodeToLegacy((beatmap, new TestLegacySkin(beatmaps_resource_store, string.Empty)));
+            var decodedAfterEncode = DecodeFromLegacy(encoded, beatmaps_resource_store, string.Empty);

            Assert.That(decodedAfterEncode.beatmap.HitObjects[0].Samples[0].Suffix, Is.Null);
            Assert.That(decodedAfterEncode.beatmap.HitObjects[0].Samples[0].UseBeatmapSamples, Is.False);
@@ -263,7 +267,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
            Assert.That(decodedAfterEncode.beatmap.HitObjects[2].Samples[0].UseBeatmapSamples, Is.True);
        }

-        private bool areComboColoursEqual(IHasComboColours a, IHasComboColours b)
+        private static bool areComboColoursEqual(IHasComboColours a, IHasComboColours b)
        {
            // equal to null, no need to SequenceEqual
            if (a.ComboColours == null && b.ComboColours == null)
@@ -275,7 +279,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
            return a.ComboColours.SequenceEqual(b.ComboColours);
        }

-        private void sort(IBeatmap beatmap)
+        public static void Sort(IBeatmap beatmap)
        {
            // Sort control points to ensure a sane ordering, as they may be parsed in different orders. This works because each group contains only uniquely-typed control points.
            foreach (var g in beatmap.ControlPointInfo.Groups)
@@ -285,19 +289,19 @@ namespace osu.Game.Tests.Beatmaps.Formats
            }
        }

-        private (IBeatmap beatmap, TestLegacySkin skin) decodeFromLegacy(Stream stream, string name, int version = LegacyDecoder<Beatmap>.LATEST_VERSION)
+        public static (IBeatmap beatmap, TestLegacySkin skin) DecodeFromLegacy(Stream stream, IResourceStore<byte[]> beatmapsResourceStore, string name, int version = LegacyDecoder<Beatmap>.LATEST_VERSION)
        {
            using (var reader = new LineBufferedReader(stream))
            {
                var beatmap = new LegacyBeatmapDecoder(version) { ApplyOffsets = false }.Decode(reader);
-                var beatmapSkin = new TestLegacySkin(beatmaps_resource_store, name);
+                var beatmapSkin = new TestLegacySkin(beatmapsResourceStore, name);
                stream.Seek(0, SeekOrigin.Begin);
                beatmapSkin.Configuration = new LegacySkinDecoder().Decode(reader);
                return (convert(beatmap), beatmapSkin);
            }
        }

-        private class TestLegacySkin : LegacySkin
+        public class TestLegacySkin : LegacySkin
        {
            public TestLegacySkin(IResourceStore<byte[]> fallbackStore, string fileName)
                : base(new SkinInfo { Name = "Test Skin", Creator = "Craftplacer" }, null, fallbackStore, fileName)
@@ -305,7 +309,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
            }
        }

-        private MemoryStream encodeToLegacy((IBeatmap beatmap, ISkin skin) fullBeatmap)
+        public static MemoryStream EncodeToLegacy((IBeatmap beatmap, ISkin skin) fullBeatmap)
        {
            var (beatmap, beatmapSkin) = fullBeatmap;
            var stream = new MemoryStream();
@@ -318,7 +322,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
            return stream;
        }

-        private IBeatmap convert(IBeatmap beatmap)
+        private static IBeatmap convert(IBeatmap beatmap)
        {
            switch (beatmap.BeatmapInfo.Ruleset.OnlineID)
            {
@@ -65,6 +65,7 @@ namespace osu.Game.Tests.Beatmaps
        }

        [Test]
+        [FlakyTest] // one fix attempted in https://github.com/ppy/osu/pull/37178, didn't work
        public void TestInvalidationFlow()
        {
            BeatmapInfo postEditBeatmapInfo = null;
@@ -187,6 +187,7 @@ namespace osu.Game.Tests.Database
        }

        [Test]
+        [FlakyTest]
        public void TestCustomRulesetScoreNotSubjectToUpgrades([Values] bool available)
        {
            RulesetInfo rulesetInfo = null!;
@@ -7,9 +7,11 @@ using NUnit.Framework;
 using osu.Game.Audio;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Beatmaps.Timing;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Checks;
 using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Edit.Checks;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Tests.Beatmaps;

@@ -18,7 +20,7 @@ namespace osu.Game.Tests.Editing.Checks
    [TestFixture]
    public class CheckFewHitsoundsTest
    {
-        private CheckFewHitsounds check = null!;
+        private CheckOsuFewHitsounds check = null!;

        private List<HitSampleInfo> notHitsounded = null!;
        private List<HitSampleInfo> hitsounded = null!;
@@ -26,7 +28,7 @@ namespace osu.Game.Tests.Editing.Checks
        [SetUp]
        public void Setup()
        {
-            check = new CheckFewHitsounds();
+            check = new CheckOsuFewHitsounds();
            notHitsounded = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) };
            hitsounded = new List<HitSampleInfo>
            {
@@ -82,6 +84,43 @@ namespace osu.Game.Tests.Editing.Checks
            assertOk(hitObjects);
        }

+        [Test]
+        public void TestRarelyHitsoundedLongWallTimeMostlyBreak()
+        {
+            var hitObjects = new List<HitObject>
+            {
+                new HitCircle { StartTime = 0, Samples = hitsounded },
+                new HitCircle { StartTime = 1000, Samples = notHitsounded },
+                new HitCircle { StartTime = 2000, Samples = notHitsounded },
+                new HitCircle { StartTime = 3000, Samples = notHitsounded },
+                new HitCircle { StartTime = 4000, Samples = notHitsounded },
+                new HitCircle { StartTime = 5000, Samples = notHitsounded },
+                new HitCircle { StartTime = 10000, Samples = hitsounded },
+            };
+
+            // 10s since last hitsound, but 6s overlap a break → 4s without hitsounds (below warning threshold).
+            assertOk(hitObjects, new BreakPeriod(4000, 10000));
+        }
+
+        [Test]
+        public void TestRarelyHitsoundedLongWallTimeMostlySpinner()
+        {
+            var hitObjects = new List<HitObject>
+            {
+                new HitCircle { StartTime = 0, Samples = hitsounded },
+                new HitCircle { StartTime = 200, Samples = notHitsounded },
+                new HitCircle { StartTime = 400, Samples = notHitsounded },
+                new HitCircle { StartTime = 600, Samples = notHitsounded },
+                new HitCircle { StartTime = 800, Samples = notHitsounded },
+                new HitCircle { StartTime = 1000, Samples = notHitsounded },
+                new Spinner { StartTime = 1200, EndTime = 21200, Samples = notHitsounded },
+                new HitCircle { StartTime = 21400, Samples = hitsounded },
+            };
+
+            // 21.4s since last hitsound, but 20s overlap a spinner → 1.4s without hitsounds.
+            assertOk(hitObjects);
+        }
+
        [Test]
        public void TestLightlyHitsounded()
        {
@@ -194,9 +233,9 @@ namespace osu.Game.Tests.Editing.Checks
            assertOk(hitObjects);
        }

-        private void assertOk(List<HitObject> hitObjects)
+        private void assertOk(List<HitObject> hitObjects, params BreakPeriod[] breaks)
        {
-            Assert.That(check.Run(getContext(hitObjects)), Is.Empty);
+            Assert.That(check.Run(getContext(hitObjects, breaks)), Is.Empty);
        }

        private void assertLongPeriodProblem(List<HitObject> hitObjects, int count = 1)
@@ -231,10 +270,13 @@ namespace osu.Game.Tests.Editing.Checks
            Assert.That(issues.Any(issue => issue.Template is CheckFewHitsounds.IssueTemplateNoHitsounds));
        }

-        private BeatmapVerifierContext getContext(List<HitObject> hitObjects)
+        private BeatmapVerifierContext getContext(List<HitObject> hitObjects, params BreakPeriod[] breaks)
        {
            var beatmap = new Beatmap<HitObject> { HitObjects = hitObjects };

+            foreach (var b in breaks)
+                beatmap.Breaks.Add(b);
+
            return new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap));
        }
    }
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				{"Mappings":[{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":125.0,"Objects":[{"StartTime":125.0,"EndTime":125.0,"Column":1}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":250.0,"Objects":[{"StartTime":250.0,"EndTime":250.0,"Column":2}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":375.0,"Objects":[{"StartTime":375.0,"EndTime":375.0,"Column":3}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":500.0,"Objects":[{"StartTime":500.0,"EndTime":500.0,"Column":4}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":625.0,"Objects":[{"StartTime":625.0,"EndTime":625.0,"Column":5}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":750.0,"Objects":[{"StartTime":750.0,"EndTime":750.0,"Column":6}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":875.0,"Objects":[{"StartTime":875.0,"EndTime":875.0,"Column":7}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1000.0,"Objects":[{"StartTime":1000.0,"EndTime":1000.0,"Column":8}]},{"RandomW":273326509,"RandomX":511,"RandomY":842502087,"RandomZ":3579807591,"StartTime":1125.0,"Objects":[{"StartTime":1125.0,"EndTime":1125.0,"Column":9}]}]}
				`@@ -0,0 +1 @@`
				`{"Mappings":[{"RandomW":273326509,"RandomX":331,"RandomY":842502087,"RandomZ":3579807591,"StartTime":0.0,"Objects":[{"StartTime":0.0,"EndTime":0.0,"Column":0}]}]}`