Merge branch 'master' into fix-beatmap-import-fk-failure

.github/workflows/ci.yml

@@ -15,6 +15,7 @@ jobs:
             - { prettyname: macOS, fullname: macos-latest }
             - { prettyname: Linux, fullname: ubuntu-latest }
           threadingMode: ['SingleThread', 'MultiThreaded']
+    timeout-minutes: 60
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/report-nunit.yml

@@ -21,6 +21,7 @@ jobs:
             - { prettyname: macOS }
             - { prettyname: Linux }
           threadingMode: ['SingleThread', 'MultiThreaded']
+    timeout-minutes: 5
     steps:
       - name: Annotate CI run with test results
         uses: dorny/test-reporter@v1.4.2

.idea/.idea.osu.Desktop/.idea/dataSources.xml

@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
-    <data-source source="LOCAL" name="osu-client-sqlite" uuid="1aa4b9be-cd8d-47ae-8186-30a13cd724a5">
-      <driver-ref>sqlite.xerial</driver-ref>
-      <synchronize>true</synchronize>
-      <jdbc-driver>org.sqlite.JDBC</jdbc-driver>
-      <jdbc-url>jdbc:sqlite:$USER_HOME$/.local/share/osu/client.db</jdbc-url>
-      <driver-properties>
-        <property name="enable_load_extension" value="true" />
-      </driver-properties>
-    </data-source>
-  </component>
-</project>

FodyWeavers.xml

@@ -1,3 +1,3 @@
 <Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
-  <Realm />
+  <Realm DisableAnalytics="true" />
 </Weavers>

osu.Android.props

@@ -52,7 +52,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2021.618.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.622.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.628.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">
     <!-- Realm needs to be directly referenced in all Xamarin projects, as it will not pull in its transitive dependencies otherwise. -->

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

@@ -6,8 +6,8 @@ using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
-using osu.Game.Rulesets.Catch.UI;
 using osu.Framework.Graphics;
+using osu.Game.Rulesets.Catch.UI;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
 using osu.Framework.Utils;
@@ -31,10 +31,23 @@ namespace osu.Game.Rulesets.Catch.Tests
         [Resolved]
         private OsuConfigManager config { get; set; }
 
-        private Container<CaughtObject> droppedObjectContainer;
+        [Cached]
+        private readonly DroppedObjectContainer droppedObjectContainer;
+
+        private readonly Container trailContainer;
 
         private TestCatcher catcher;
 
+        public TestSceneCatcher()
+        {
+            Add(trailContainer = new Container
+            {
+                Anchor = Anchor.Centre,
+                Depth = -1
+            });
+            Add(droppedObjectContainer = new DroppedObjectContainer());
+        }
+
         [SetUp]
         public void SetUp() => Schedule(() =>
         {
@@ -43,20 +56,13 @@ namespace osu.Game.Rulesets.Catch.Tests
                 CircleSize = 0,
             };
 
-            var trailContainer = new Container();
-            droppedObjectContainer = new Container<CaughtObject>();
-            catcher = new TestCatcher(trailContainer, droppedObjectContainer, difficulty);
+            if (catcher != null)
+                Remove(catcher);
 
-            Child = new Container
+            Add(catcher = new TestCatcher(trailContainer, difficulty)
             {
-                Anchor = Anchor.Centre,
-                Children = new Drawable[]
-                {
-                    trailContainer,
-                    droppedObjectContainer,
-                    catcher
-                }
-            };
+                Anchor = Anchor.Centre
+            });
         });
 
         [Test]
@@ -293,8 +299,8 @@ namespace osu.Game.Rulesets.Catch.Tests
         {
             public IEnumerable<CaughtObject> CaughtObjects => this.ChildrenOfType<CaughtObject>();
 
-            public TestCatcher(Container trailsTarget, Container<CaughtObject> droppedObjectTarget, BeatmapDifficulty difficulty)
-                : base(trailsTarget, droppedObjectTarget, difficulty)
+            public TestCatcher(Container trailsTarget, BeatmapDifficulty difficulty)
+                : base(trailsTarget, difficulty)
             {
             }
         }

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

@@ -6,7 +6,6 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
 using osu.Framework.Threading;
 using osu.Framework.Utils;
@@ -97,18 +96,12 @@ namespace osu.Game.Rulesets.Catch.Tests
 
             SetContents(_ =>
             {
-                var droppedObjectContainer = new Container<CaughtObject>
-                {
-                    RelativeSizeAxes = Axes.Both
-                };
-
                 return new CatchInputManager(catchRuleset)
                 {
                     RelativeSizeAxes = Axes.Both,
                     Children = new Drawable[]
                     {
-                        droppedObjectContainer,
-                        new TestCatcherArea(droppedObjectContainer, beatmapDifficulty)
+                        new TestCatcherArea(beatmapDifficulty)
                         {
                             Anchor = Anchor.Centre,
                             Origin = Anchor.TopCentre,
@@ -126,9 +119,13 @@ namespace osu.Game.Rulesets.Catch.Tests
 
         private class TestCatcherArea : CatcherArea
         {
-            public TestCatcherArea(Container<CaughtObject> droppedObjectContainer, BeatmapDifficulty beatmapDifficulty)
-                : base(droppedObjectContainer, beatmapDifficulty)
+            [Cached]
+            private readonly DroppedObjectContainer droppedObjectContainer;
+
+            public TestCatcherArea(BeatmapDifficulty beatmapDifficulty)
+                : base(beatmapDifficulty)
             {
+                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
             }
 
             public void ToggleHyperDash(bool status) => MovableCatcher.SetHyperDashState(status ? 2 : 1);

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

@@ -118,11 +118,10 @@ namespace osu.Game.Rulesets.Catch.Tests
 
             AddStep("create hyper-dashing catcher", () =>
             {
-                Child = setupSkinHierarchy(catcherArea = new CatcherArea(new Container<CaughtObject>())
+                Child = setupSkinHierarchy(catcherArea = new TestCatcherArea
                 {
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
-                    Scale = new Vector2(4f),
+                    Origin = Anchor.Centre
                 }, skin);
             });
 
@@ -206,5 +205,18 @@ namespace osu.Game.Rulesets.Catch.Tests
             {
             }
         }
+
+        private class TestCatcherArea : CatcherArea
+        {
+            [Cached]
+            private readonly DroppedObjectContainer droppedObjectContainer;
+
+            public TestCatcherArea()
+            {
+                Scale = new Vector2(4f);
+
+                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
+            }
+        }
     }
 }

osu.Game.Rulesets.Catch/Beatmaps/CatchBeatmapProcessor.cs

@@ -8,7 +8,6 @@ using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Catch.MathUtils;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Catch.UI;
-using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects.Types;
 
 namespace osu.Game.Rulesets.Catch.Beatmaps
@@ -17,6 +16,8 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
     {
         public const int RNG_SEED = 1337;
 
+        public bool HardRockOffsets { get; set; }
+
         public CatchBeatmapProcessor(IBeatmap beatmap)
             : base(beatmap)
         {
@@ -43,11 +44,10 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
             }
         }
 
-        public static void ApplyPositionOffsets(IBeatmap beatmap, params Mod[] mods)
+        public void ApplyPositionOffsets(IBeatmap beatmap)
         {
             var rng = new FastRandom(RNG_SEED);
 
-            bool shouldApplyHardRockOffset = mods.Any(m => m is ModHardRock);
             float? lastPosition = null;
             double lastStartTime = 0;
 
@@ -58,7 +58,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
                 switch (obj)
                 {
                     case Fruit fruit:
-                        if (shouldApplyHardRockOffset)
+                        if (HardRockOffsets)
                             applyHardRockOffset(fruit, ref lastPosition, ref lastStartTime, rng);
                         break;
 

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

@@ -5,11 +5,12 @@ using System.Linq;
 using osu.Framework.Bindables;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
+using osu.Game.Rulesets.Catch.Beatmaps;
 using osu.Game.Rulesets.Mods;
 
 namespace osu.Game.Rulesets.Catch.Mods
 {
-    public class CatchModDifficultyAdjust : ModDifficultyAdjust
+    public class CatchModDifficultyAdjust : ModDifficultyAdjust, IApplicableToBeatmapProcessor
     {
         [SettingSource("Circle Size", "Override a beatmap's set CS.", FIRST_SETTING_ORDER - 1)]
         public BindableNumber<float> CircleSize { get; } = new BindableFloatWithLimitExtension
@@ -31,6 +32,9 @@ namespace osu.Game.Rulesets.Catch.Mods
             Value = 5,
         };
 
+        [SettingSource("Spicy Patterns", "Adjust the patterns as if Hard Rock is enabled.")]
+        public BindableBool HardRockOffsets { get; } = new BindableBool();
+
         protected override void ApplyLimits(bool extended)
         {
             base.ApplyLimits(extended);
@@ -45,12 +49,14 @@ namespace osu.Game.Rulesets.Catch.Mods
             {
                 string circleSize = CircleSize.IsDefault ? string.Empty : $"CS {CircleSize.Value:N1}";
                 string approachRate = ApproachRate.IsDefault ? string.Empty : $"AR {ApproachRate.Value:N1}";
+                string spicyPatterns = HardRockOffsets.IsDefault ? string.Empty : "Spicy patterns";
 
                 return string.Join(", ", new[]
                 {
                     circleSize,
                     base.SettingDescription,
-                    approachRate
+                    approachRate,
+                    spicyPatterns,
                 }.Where(s => !string.IsNullOrEmpty(s)));
             }
         }
@@ -70,5 +76,11 @@ namespace osu.Game.Rulesets.Catch.Mods
             ApplySetting(CircleSize, cs => difficulty.CircleSize = cs);
             ApplySetting(ApproachRate, ar => difficulty.ApproachRate = ar);
         }
+
+        public void ApplyToBeatmapProcessor(IBeatmapProcessor beatmapProcessor)
+        {
+            var catchProcessor = (CatchBeatmapProcessor)beatmapProcessor;
+            catchProcessor.HardRockOffsets = HardRockOffsets.Value;
+        }
     }
 }

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

@@ -7,10 +7,14 @@ using osu.Game.Rulesets.Catch.Beatmaps;
 
 namespace osu.Game.Rulesets.Catch.Mods
 {
-    public class CatchModHardRock : ModHardRock, IApplicableToBeatmap
+    public class CatchModHardRock : ModHardRock, IApplicableToBeatmapProcessor
     {
         public override double ScoreMultiplier => 1.12;
 
-        public void ApplyToBeatmap(IBeatmap beatmap) => CatchBeatmapProcessor.ApplyPositionOffsets(beatmap, this);
+        public void ApplyToBeatmapProcessor(IBeatmapProcessor beatmapProcessor)
+        {
+            var catchProcessor = (CatchBeatmapProcessor)beatmapProcessor;
+            catchProcessor.HardRockOffsets = true;
+        }
     }
 }

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

@@ -3,7 +3,6 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Catch.Objects;
 using osu.Game.Rulesets.Catch.Objects.Drawables;
@@ -27,6 +26,9 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         public const float CENTER_X = WIDTH / 2;
 
+        [Cached]
+        private readonly DroppedObjectContainer droppedObjectContainer;
+
         internal readonly CatcherArea CatcherArea;
 
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
@@ -35,12 +37,7 @@ namespace osu.Game.Rulesets.Catch.UI
 
         public CatchPlayfield(BeatmapDifficulty difficulty)
         {
-            var droppedObjectContainer = new Container<CaughtObject>
-            {
-                RelativeSizeAxes = Axes.Both,
-            };
-
-            CatcherArea = new CatcherArea(droppedObjectContainer, difficulty)
+            CatcherArea = new CatcherArea(difficulty)
             {
                 Anchor = Anchor.BottomLeft,
                 Origin = Anchor.TopLeft,
@@ -48,7 +45,7 @@ namespace osu.Game.Rulesets.Catch.UI
 
             InternalChildren = new[]
             {
-                droppedObjectContainer,
+                droppedObjectContainer = new DroppedObjectContainer(),
                 CatcherArea.MovableCatcher.CreateProxiedContent(),
                 HitObjectContainer.CreateProxy(),
                 // This ordering (`CatcherArea` before `HitObjectContainer`) is important to

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

@@ -79,7 +79,8 @@ namespace osu.Game.Rulesets.Catch.UI
         /// <summary>
         /// Contains objects dropped from the plate.
         /// </summary>
-        private readonly Container<CaughtObject> droppedObjectTarget;
+        [Resolved]
+        private DroppedObjectContainer droppedObjectTarget { get; set; }
 
         public CatcherAnimationState CurrentState
         {
@@ -134,10 +135,9 @@ namespace osu.Game.Rulesets.Catch.UI
         private readonly DrawablePool<CaughtBanana> caughtBananaPool;
         private readonly DrawablePool<CaughtDroplet> caughtDropletPool;
 
-        public Catcher([NotNull] Container trailsTarget, [NotNull] Container<CaughtObject> droppedObjectTarget, BeatmapDifficulty difficulty = null)
+        public Catcher([NotNull] Container trailsTarget, BeatmapDifficulty difficulty = null)
         {
             this.trailsTarget = trailsTarget;
-            this.droppedObjectTarget = droppedObjectTarget;
 
             Origin = Anchor.TopCentre;
 

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

@@ -30,7 +30,7 @@ namespace osu.Game.Rulesets.Catch.UI
         /// </summary>
         private int currentDirection;
 
-        public CatcherArea(Container<CaughtObject> droppedObjectContainer, BeatmapDifficulty difficulty = null)
+        public CatcherArea(BeatmapDifficulty difficulty = null)
         {
             Size = new Vector2(CatchPlayfield.WIDTH, CATCHER_SIZE);
             Children = new Drawable[]
@@ -44,7 +44,7 @@ namespace osu.Game.Rulesets.Catch.UI
                     Margin = new MarginPadding { Bottom = 350f },
                     X = CatchPlayfield.CENTER_X
                 },
-                MovableCatcher = new Catcher(this, droppedObjectContainer, difficulty) { X = CatchPlayfield.CENTER_X },
+                MovableCatcher = new Catcher(this, difficulty) { X = CatchPlayfield.CENTER_X },
             };
         }
 

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

@@ -37,6 +37,7 @@ namespace osu.Game.Rulesets.Catch.UI
         protected override void FreeAfterUse()
         {
             ClearTransforms();
+            Alpha = 1;
             base.FreeAfterUse();
         }
     }

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

@@ -0,0 +1,17 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.Catch.Objects.Drawables;
+
+namespace osu.Game.Rulesets.Catch.UI
+{
+    public class DroppedObjectContainer : Container<CaughtObject>
+    {
+        public DroppedObjectContainer()
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+    }
+}

osu.Game.Rulesets.Mania/ManiaSettingsSubsection.cs

@@ -3,6 +3,7 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Settings;
 using osu.Game.Rulesets.Mania.Configuration;
@@ -47,7 +48,7 @@ namespace osu.Game.Rulesets.Mania
 
         private class TimeSlider : OsuSliderBar<double>
         {
-            public override string TooltipText => Current.Value.ToString("N0") + "ms";
+            public override LocalisableString TooltipText => Current.Value.ToString(@"N0") + "ms";
         }
     }
 }

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

@@ -13,6 +13,7 @@ using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Primitives;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Framework.Utils;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
@@ -283,6 +284,6 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             }
         }
 
-        public string TooltipText => ControlPoint.Type.Value.ToString() ?? string.Empty;
+        public LocalisableString TooltipText => ControlPoint.Type.Value.ToString() ?? string.Empty;
     }
 }

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

@@ -12,6 +12,7 @@ using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.UI;
+using osu.Game.Rulesets.Osu.Utils;
 using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Mods
@@ -23,15 +24,6 @@ namespace osu.Game.Rulesets.Osu.Mods
     {
         public override string Description => "It never gets boring!";
 
-        // The relative distance to the edge of the playfield before objects' positions should start to "turn around" and curve towards the middle.
-        // The closer the hit objects draw to the border, the sharper the turn
-        private const float playfield_edge_ratio = 0.375f;
-
-        private static readonly float border_distance_x = OsuPlayfield.BASE_SIZE.X * playfield_edge_ratio;
-        private static readonly float border_distance_y = OsuPlayfield.BASE_SIZE.Y * playfield_edge_ratio;
-
-        private static readonly Vector2 playfield_middle = OsuPlayfield.BASE_SIZE / 2;
-
         private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
 
         private Random rng;
@@ -113,7 +105,7 @@ namespace osu.Game.Rulesets.Osu.Mods
                 distanceToPrev * (float)Math.Sin(current.AngleRad)
             );
 
-            posRelativeToPrev = getRotatedVector(previous.EndPositionRandomised, posRelativeToPrev);
+            posRelativeToPrev = OsuHitObjectGenerationUtils.RotateAwayFromEdge(previous.EndPositionRandomised, posRelativeToPrev);
 
             current.AngleRad = (float)Math.Atan2(posRelativeToPrev.Y, posRelativeToPrev.X);
 
@@ -185,73 +177,6 @@ namespace osu.Game.Rulesets.Osu.Mods
             }
         }
 
-        /// <summary>
-        /// Determines the position of the current hit object relative to the previous one.
-        /// </summary>
-        /// <returns>The position of the current hit object relative to the previous one</returns>
-        private Vector2 getRotatedVector(Vector2 prevPosChanged, Vector2 posRelativeToPrev)
-        {
-            var relativeRotationDistance = 0f;
-
-            if (prevPosChanged.X < playfield_middle.X)
-            {
-                relativeRotationDistance = Math.Max(
-                    (border_distance_x - prevPosChanged.X) / border_distance_x,
-                    relativeRotationDistance
-                );
-            }
-            else
-            {
-                relativeRotationDistance = Math.Max(
-                    (prevPosChanged.X - (OsuPlayfield.BASE_SIZE.X - border_distance_x)) / border_distance_x,
-                    relativeRotationDistance
-                );
-            }
-
-            if (prevPosChanged.Y < playfield_middle.Y)
-            {
-                relativeRotationDistance = Math.Max(
-                    (border_distance_y - prevPosChanged.Y) / border_distance_y,
-                    relativeRotationDistance
-                );
-            }
-            else
-            {
-                relativeRotationDistance = Math.Max(
-                    (prevPosChanged.Y - (OsuPlayfield.BASE_SIZE.Y - border_distance_y)) / border_distance_y,
-                    relativeRotationDistance
-                );
-            }
-
-            return rotateVectorTowardsVector(posRelativeToPrev, playfield_middle - prevPosChanged, relativeRotationDistance / 2);
-        }
-
-        /// <summary>
-        /// Rotates vector "initial" towards vector "destinantion"
-        /// </summary>
-        /// <param name="initial">Vector to rotate to "destination"</param>
-        /// <param name="destination">Vector "initial" should be rotated to</param>
-        /// <param name="relativeDistance">The angle the vector should be rotated relative to the difference between the angles of the the two vectors.</param>
-        /// <returns>Resulting vector</returns>
-        private Vector2 rotateVectorTowardsVector(Vector2 initial, Vector2 destination, float relativeDistance)
-        {
-            var initialAngleRad = Math.Atan2(initial.Y, initial.X);
-            var destAngleRad = Math.Atan2(destination.Y, destination.X);
-
-            var diff = destAngleRad - initialAngleRad;
-
-            while (diff < -Math.PI) diff += 2 * Math.PI;
-
-            while (diff > Math.PI) diff -= 2 * Math.PI;
-
-            var finalAngleRad = initialAngleRad + relativeDistance * diff;
-
-            return new Vector2(
-                initial.Length * (float)Math.Cos(finalAngleRad),
-                initial.Length * (float)Math.Sin(finalAngleRad)
-            );
-        }
-
         private class RandomObjectInfo
         {
             public float AngleRad { get; set; }

osu.Game.Rulesets.Osu/Utils/OsuHitObjectGenerationUtils.cs

@@ -0,0 +1,104 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Game.Rulesets.Osu.UI;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Utils
+{
+    public static class OsuHitObjectGenerationUtils
+    {
+        // The relative distance to the edge of the playfield before objects' positions should start to "turn around" and curve towards the middle.
+        // The closer the hit objects draw to the border, the sharper the turn
+        private const float playfield_edge_ratio = 0.375f;
+
+        private static readonly float border_distance_x = OsuPlayfield.BASE_SIZE.X * playfield_edge_ratio;
+        private static readonly float border_distance_y = OsuPlayfield.BASE_SIZE.Y * playfield_edge_ratio;
+
+        private static readonly Vector2 playfield_middle = OsuPlayfield.BASE_SIZE / 2;
+
+        /// <summary>
+        /// Rotate a hit object away from the playfield edge, while keeping a constant distance
+        /// from the previous object.
+        /// </summary>
+        /// <remarks>
+        /// The extent of rotation depends on the position of the hit object. Hit objects
+        /// closer to the playfield edge will be rotated to a larger extent.
+        /// </remarks>
+        /// <param name="prevObjectPos">Position of the previous hit object.</param>
+        /// <param name="posRelativeToPrev">Position of the hit object to be rotated, relative to the previous hit object.</param>
+        /// <param name="rotationRatio">
+        /// The extent of rotation.
+        /// 0 means the hit object is never rotated.
+        /// 1 means the hit object will be fully rotated towards playfield center when it is originally at playfield edge.
+        /// </param>
+        /// <returns>The new position of the hit object, relative to the previous one.</returns>
+        public static Vector2 RotateAwayFromEdge(Vector2 prevObjectPos, Vector2 posRelativeToPrev, float rotationRatio = 0.5f)
+        {
+            var relativeRotationDistance = 0f;
+
+            if (prevObjectPos.X < playfield_middle.X)
+            {
+                relativeRotationDistance = Math.Max(
+                    (border_distance_x - prevObjectPos.X) / border_distance_x,
+                    relativeRotationDistance
+                );
+            }
+            else
+            {
+                relativeRotationDistance = Math.Max(
+                    (prevObjectPos.X - (OsuPlayfield.BASE_SIZE.X - border_distance_x)) / border_distance_x,
+                    relativeRotationDistance
+                );
+            }
+
+            if (prevObjectPos.Y < playfield_middle.Y)
+            {
+                relativeRotationDistance = Math.Max(
+                    (border_distance_y - prevObjectPos.Y) / border_distance_y,
+                    relativeRotationDistance
+                );
+            }
+            else
+            {
+                relativeRotationDistance = Math.Max(
+                    (prevObjectPos.Y - (OsuPlayfield.BASE_SIZE.Y - border_distance_y)) / border_distance_y,
+                    relativeRotationDistance
+                );
+            }
+
+            return RotateVectorTowardsVector(
+                posRelativeToPrev,
+                playfield_middle - prevObjectPos,
+                Math.Min(1, relativeRotationDistance * rotationRatio)
+            );
+        }
+
+        /// <summary>
+        /// Rotates vector "initial" towards vector "destination".
+        /// </summary>
+        /// <param name="initial">The vector to be rotated.</param>
+        /// <param name="destination">The vector that "initial" should be rotated towards.</param>
+        /// <param name="rotationRatio">How much "initial" should be rotated. 0 means no rotation. 1 means "initial" is fully rotated to equal "destination".</param>
+        /// <returns>The rotated vector.</returns>
+        public static Vector2 RotateVectorTowardsVector(Vector2 initial, Vector2 destination, float rotationRatio)
+        {
+            var initialAngleRad = MathF.Atan2(initial.Y, initial.X);
+            var destAngleRad = MathF.Atan2(destination.Y, destination.X);
+
+            var diff = destAngleRad - initialAngleRad;
+
+            while (diff < -MathF.PI) diff += 2 * MathF.PI;
+
+            while (diff > MathF.PI) diff -= 2 * MathF.PI;
+
+            var finalAngleRad = initialAngleRad + rotationRatio * diff;
+
+            return new Vector2(
+                initial.Length * MathF.Cos(finalAngleRad),
+                initial.Length * MathF.Sin(finalAngleRad)
+            );
+        }
+    }
+}

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

@@ -242,6 +242,7 @@ namespace osu.Game.Tests.Beatmaps.IO
         }
 
         [Test]
+        [Ignore("intentionally broken by import optimisations")]
         public async Task TestImportThenImportWithChangedFile()
         {
             using (HeadlessGameHost host = new CleanRunHeadlessGameHost(nameof(ImportBeatmapTest)))
@@ -344,6 +345,7 @@ namespace osu.Game.Tests.Beatmaps.IO
         }
 
         [Test]
+        [Ignore("intentionally broken by import optimisations")]
         public async Task TestImportCorruptThenImport()
         {
             // unfortunately for the time being we need to reference osu.Framework.Desktop for a game host here.
@@ -489,12 +491,11 @@ namespace osu.Game.Tests.Beatmaps.IO
             }
         }
 
-        [TestCase(true)]
-        [TestCase(false)]
-        public async Task TestImportThenDeleteThenImportWithOnlineIDMismatch(bool set)
+        [Test]
+        public async Task TestImportThenDeleteThenImportWithOnlineIDsMissing()
         {
             // unfortunately for the time being we need to reference osu.Framework.Desktop for a game host here.
-            using (HeadlessGameHost host = new CleanRunHeadlessGameHost($"{nameof(ImportBeatmapTest)}-{set}"))
+            using (HeadlessGameHost host = new CleanRunHeadlessGameHost($"{nameof(ImportBeatmapTest)}"))
             {
                 try
                 {
@@ -502,10 +503,8 @@ namespace osu.Game.Tests.Beatmaps.IO
 
                     var imported = await LoadOszIntoOsu(osu);
 
-                    if (set)
-                        imported.OnlineBeatmapSetID = 1234;
-                    else
-                        imported.Beatmaps.First().OnlineBeatmapID = 1234;
+                    foreach (var b in imported.Beatmaps)
+                        b.OnlineBeatmapID = null;
 
                     osu.Dependencies.Get<BeatmapManager>().Update(imported);
 

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

@@ -0,0 +1,241 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Audio;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Tests.Editing.Checks
+{
+    [TestFixture]
+    public class CheckFewHitsoundsTest
+    {
+        private CheckFewHitsounds check;
+
+        private List<HitSampleInfo> notHitsounded;
+        private List<HitSampleInfo> hitsounded;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckFewHitsounds();
+            notHitsounded = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) };
+            hitsounded = new List<HitSampleInfo>
+            {
+                new HitSampleInfo(HitSampleInfo.HIT_NORMAL),
+                new HitSampleInfo(HitSampleInfo.HIT_FINISH)
+            };
+        }
+
+        [Test]
+        public void TestHitsounded()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 16; ++i)
+            {
+                var samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) };
+
+                if ((i + 1) % 2 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_CLAP));
+                if ((i + 1) % 3 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_WHISTLE));
+                if ((i + 1) % 4 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_FINISH));
+
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = samples });
+            }
+
+            assertOk(hitObjects);
+        }
+
+        [Test]
+        public void TestHitsoundedWithBreak()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 32; ++i)
+            {
+                var samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) };
+
+                if ((i + 1) % 2 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_CLAP));
+                if ((i + 1) % 3 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_WHISTLE));
+                if ((i + 1) % 4 == 0)
+                    samples.Add(new HitSampleInfo(HitSampleInfo.HIT_FINISH));
+                // Leaves a gap in which no hitsounds exist or can be added, and so shouldn't be an issue.
+                if (i > 8 && i < 24)
+                    continue;
+
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = samples });
+            }
+
+            assertOk(hitObjects);
+        }
+
+        [Test]
+        public void TestLightlyHitsounded()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 30; ++i)
+            {
+                var samples = i % 8 == 0 ? hitsounded : notHitsounded;
+
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = samples });
+            }
+
+            assertLongPeriodNegligible(hitObjects, count: 3);
+        }
+
+        [Test]
+        public void TestRarelyHitsounded()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 30; ++i)
+            {
+                var samples = (i == 0 || i == 15) ? hitsounded : notHitsounded;
+
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = samples });
+            }
+
+            // Should prompt one warning between 1st and 16th, and another between 16th and 31st.
+            assertLongPeriodWarning(hitObjects, count: 2);
+        }
+
+        [Test]
+        public void TestExtremelyRarelyHitsounded()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 80; ++i)
+            {
+                var samples = i == 40 ? hitsounded : notHitsounded;
+
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = samples });
+            }
+
+            // Should prompt one problem between 1st and 41st, and another between 41st and 81st.
+            assertLongPeriodProblem(hitObjects, count: 2);
+        }
+
+        [Test]
+        public void TestNotHitsounded()
+        {
+            var hitObjects = new List<HitObject>();
+
+            for (int i = 0; i < 20; ++i)
+                hitObjects.Add(new HitCircle { StartTime = 1000 * i, Samples = notHitsounded });
+
+            assertNoHitsounds(hitObjects);
+        }
+
+        [Test]
+        public void TestNestedObjectsHitsounded()
+        {
+            var ticks = new List<HitObject>();
+            for (int i = 1; i < 16; ++i)
+                ticks.Add(new SliderTick { StartTime = 1000 * i, Samples = hitsounded });
+
+            var nested = new MockNestableHitObject(ticks.ToList(), 0, 16000)
+            {
+                Samples = hitsounded
+            };
+            nested.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { nested });
+        }
+
+        [Test]
+        public void TestNestedObjectsRarelyHitsounded()
+        {
+            var ticks = new List<HitObject>();
+            for (int i = 1; i < 16; ++i)
+                ticks.Add(new SliderTick { StartTime = 1000 * i, Samples = i == 0 ? hitsounded : notHitsounded });
+
+            var nested = new MockNestableHitObject(ticks.ToList(), 0, 16000)
+            {
+                Samples = hitsounded
+            };
+            nested.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+            assertLongPeriodWarning(new List<HitObject> { nested });
+        }
+
+        [Test]
+        public void TestConcurrentObjects()
+        {
+            var hitObjects = new List<HitObject>();
+
+            var ticks = new List<HitObject>();
+            for (int i = 1; i < 10; ++i)
+                ticks.Add(new SliderTick { StartTime = 5000 * i, Samples = hitsounded });
+
+            var nested = new MockNestableHitObject(ticks.ToList(), 0, 50000)
+            {
+                Samples = notHitsounded
+            };
+            nested.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+            hitObjects.Add(nested);
+
+            for (int i = 1; i <= 6; ++i)
+                hitObjects.Add(new HitCircle { StartTime = 10000 * i, Samples = notHitsounded });
+
+            assertOk(hitObjects);
+        }
+
+        private void assertOk(List<HitObject> hitObjects)
+        {
+            Assert.That(check.Run(getContext(hitObjects)), Is.Empty);
+        }
+
+        private void assertLongPeriodProblem(List<HitObject> hitObjects, int count = 1)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(count));
+            Assert.That(issues.All(issue => issue.Template is CheckFewHitsounds.IssueTemplateLongPeriodProblem));
+        }
+
+        private void assertLongPeriodWarning(List<HitObject> hitObjects, int count = 1)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(count));
+            Assert.That(issues.All(issue => issue.Template is CheckFewHitsounds.IssueTemplateLongPeriodWarning));
+        }
+
+        private void assertLongPeriodNegligible(List<HitObject> hitObjects, int count = 1)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(count));
+            Assert.That(issues.All(issue => issue.Template is CheckFewHitsounds.IssueTemplateLongPeriodNegligible));
+        }
+
+        private void assertNoHitsounds(List<HitObject> hitObjects)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Any(issue => issue.Template is CheckFewHitsounds.IssueTemplateNoHitsounds));
+        }
+
+        private BeatmapVerifierContext getContext(List<HitObject> hitObjects)
+        {
+            var beatmap = new Beatmap<HitObject> { HitObjects = hitObjects };
+
+            return new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap));
+        }
+    }
+}

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

@@ -0,0 +1,289 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Audio;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Tests.Editing.Checks
+{
+    [TestFixture]
+    public class CheckMutedObjectsTest
+    {
+        private CheckMutedObjects check;
+        private ControlPointInfo cpi;
+
+        private const int volume_regular = 50;
+        private const int volume_low = 15;
+        private const int volume_muted = 5;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckMutedObjects();
+
+            cpi = new ControlPointInfo();
+            cpi.Add(0, new SampleControlPoint { SampleVolume = volume_regular });
+            cpi.Add(1000, new SampleControlPoint { SampleVolume = volume_low });
+            cpi.Add(2000, new SampleControlPoint { SampleVolume = volume_muted });
+        }
+
+        [Test]
+        public void TestNormalControlPointVolume()
+        {
+            var hitcircle = new HitCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestLowControlPointVolume()
+        {
+            var hitcircle = new HitCircle
+            {
+                StartTime = 1000,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertLowVolume(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestMutedControlPointVolume()
+        {
+            var hitcircle = new HitCircle
+            {
+                StartTime = 2000,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMuted(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestNormalSampleVolume()
+        {
+            // The sample volume should take precedence over the control point volume.
+            var hitcircle = new HitCircle
+            {
+                StartTime = 2000,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_regular) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestLowSampleVolume()
+        {
+            var hitcircle = new HitCircle
+            {
+                StartTime = 2000,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_low) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertLowVolume(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestMutedSampleVolume()
+        {
+            var hitcircle = new HitCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_muted) }
+            };
+            hitcircle.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMuted(new List<HitObject> { hitcircle });
+        }
+
+        [Test]
+        public void TestNormalSampleVolumeSlider()
+        {
+            var sliderHead = new SliderHeadCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            sliderHead.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var sliderTick = new SliderTick
+            {
+                StartTime = 250,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo("slidertick", volume: volume_muted) } // Should be fine.
+            };
+            sliderTick.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var slider = new MockNestableHitObject(new List<HitObject> { sliderHead, sliderTick, }, startTime: 0, endTime: 500)
+            {
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            slider.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertOk(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestMutedSampleVolumeSliderHead()
+        {
+            var sliderHead = new SliderHeadCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_muted) }
+            };
+            sliderHead.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var sliderTick = new SliderTick
+            {
+                StartTime = 250,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo("slidertick") }
+            };
+            sliderTick.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var slider = new MockNestableHitObject(new List<HitObject> { sliderHead, sliderTick, }, startTime: 0, endTime: 500)
+            {
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) } // Applies to the tail.
+            };
+            slider.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMuted(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestMutedSampleVolumeSliderTail()
+        {
+            var sliderHead = new SliderHeadCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            sliderHead.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var sliderTick = new SliderTick
+            {
+                StartTime = 250,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo("slidertick") }
+            };
+            sliderTick.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var slider = new MockNestableHitObject(new List<HitObject> { sliderHead, sliderTick, }, startTime: 0, endTime: 2500)
+            {
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_muted) } // Applies to the tail.
+            };
+            slider.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMutedPassive(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestMutedControlPointVolumeSliderHead()
+        {
+            var sliderHead = new SliderHeadCircle
+            {
+                StartTime = 2000,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            sliderHead.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var sliderTick = new SliderTick
+            {
+                StartTime = 2250,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo("slidertick") }
+            };
+            sliderTick.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var slider = new MockNestableHitObject(new List<HitObject> { sliderHead, sliderTick, }, startTime: 2000, endTime: 2500)
+            {
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL, volume: volume_regular) }
+            };
+            slider.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMuted(new List<HitObject> { slider });
+        }
+
+        [Test]
+        public void TestMutedControlPointVolumeSliderTail()
+        {
+            var sliderHead = new SliderHeadCircle
+            {
+                StartTime = 0,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            sliderHead.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            var sliderTick = new SliderTick
+            {
+                StartTime = 250,
+                Samples = new List<HitSampleInfo> { new HitSampleInfo("slidertick") }
+            };
+            sliderTick.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            // Ends after the 5% control point.
+            var slider = new MockNestableHitObject(new List<HitObject> { sliderHead, sliderTick, }, startTime: 0, endTime: 2500)
+            {
+                Samples = new List<HitSampleInfo> { new HitSampleInfo(HitSampleInfo.HIT_NORMAL) }
+            };
+            slider.ApplyDefaults(cpi, new BeatmapDifficulty());
+
+            assertMutedPassive(new List<HitObject> { slider });
+        }
+
+        private void assertOk(List<HitObject> hitObjects)
+        {
+            Assert.That(check.Run(getContext(hitObjects)), Is.Empty);
+        }
+
+        private void assertLowVolume(List<HitObject> hitObjects, int count = 1)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(count));
+            Assert.That(issues.All(issue => issue.Template is CheckMutedObjects.IssueTemplateLowVolumeActive));
+        }
+
+        private void assertMuted(List<HitObject> hitObjects, int count = 1)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(count));
+            Assert.That(issues.All(issue => issue.Template is CheckMutedObjects.IssueTemplateMutedActive));
+        }
+
+        private void assertMutedPassive(List<HitObject> hitObjects)
+        {
+            var issues = check.Run(getContext(hitObjects)).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Any(issue => issue.Template is CheckMutedObjects.IssueTemplateMutedPassive));
+        }
+
+        private BeatmapVerifierContext getContext(List<HitObject> hitObjects)
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                ControlPointInfo = cpi,
+                HitObjects = hitObjects
+            };
+
+            return new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap));
+        }
+    }
+}

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

@@ -0,0 +1,36 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Threading;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+
+namespace osu.Game.Tests.Editing.Checks
+{
+    public sealed class MockNestableHitObject : HitObject, IHasDuration
+    {
+        private readonly IEnumerable<HitObject> toBeNested;
+
+        public MockNestableHitObject(IEnumerable<HitObject> toBeNested, double startTime, double endTime)
+        {
+            this.toBeNested = toBeNested;
+            StartTime = startTime;
+            EndTime = endTime;
+        }
+
+        protected override void CreateNestedHitObjects(CancellationToken cancellationToken)
+        {
+            foreach (var hitObject in toBeNested)
+                AddNested(hitObject);
+        }
+
+        public double EndTime { get; }
+
+        public double Duration
+        {
+            get => EndTime - StartTime;
+            set => throw new System.NotImplementedException();
+        }
+    }
+}

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

@@ -90,6 +90,20 @@ namespace osu.Game.Tests.NonVisual.Filtering
             Assert.Less(filterCriteria.DrainRate.Min, 6.1f);
         }
 
+        [Test]
+        public void TestApplyOverallDifficultyQueries()
+        {
+            const string query = "od>4 easy od<8";
+            var filterCriteria = new FilterCriteria();
+            FilterQueryParser.ApplyQueries(filterCriteria, query);
+            Assert.AreEqual("easy", filterCriteria.SearchText.Trim());
+            Assert.AreEqual(1, filterCriteria.SearchTerms.Length);
+            Assert.Greater(filterCriteria.OverallDifficulty.Min, 4.0);
+            Assert.Less(filterCriteria.OverallDifficulty.Min, 4.1);
+            Assert.Greater(filterCriteria.OverallDifficulty.Max, 7.9);
+            Assert.Less(filterCriteria.OverallDifficulty.Max, 8.0);
+        }
+
         [Test]
         public void TestApplyBPMQueries()
         {

osu.Game.Tests/Rulesets/TestSceneRulesetSkinProvidingContainer.cs

@@ -0,0 +1,95 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.OpenGL.Textures;
+using osu.Framework.Graphics.Textures;
+using osu.Game.Audio;
+using osu.Game.Rulesets;
+using osu.Game.Skinning;
+using osu.Game.Tests.Testing;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Tests.Rulesets
+{
+    public class TestSceneRulesetSkinProvidingContainer : OsuTestScene
+    {
+        private SkinRequester requester;
+
+        protected override Ruleset CreateRuleset() => new TestSceneRulesetDependencies.TestRuleset();
+
+        [Cached(typeof(ISkinSource))]
+        private readonly ISkinSource testSource = new TestSkinProvider();
+
+        [Test]
+        public void TestEarlyAddedSkinRequester()
+        {
+            Texture textureOnLoad = null;
+
+            AddStep("setup provider", () =>
+            {
+                var rulesetSkinProvider = new RulesetSkinProvidingContainer(Ruleset.Value.CreateInstance(), Beatmap.Value.Beatmap, Beatmap.Value.Skin);
+
+                rulesetSkinProvider.Add(requester = new SkinRequester());
+
+                requester.OnLoadAsync += () => textureOnLoad = requester.GetTexture(TestSkinProvider.TEXTURE_NAME);
+
+                Child = rulesetSkinProvider;
+            });
+
+            AddAssert("requester got correct initial texture", () => textureOnLoad != null);
+        }
+
+        private class SkinRequester : Drawable, ISkin
+        {
+            private ISkinSource skin;
+
+            public event Action OnLoadAsync;
+
+            [BackgroundDependencyLoader]
+            private void load(ISkinSource skin)
+            {
+                this.skin = skin;
+
+                OnLoadAsync?.Invoke();
+            }
+
+            public Drawable GetDrawableComponent(ISkinComponent component) => skin.GetDrawableComponent(component);
+
+            public Texture GetTexture(string componentName, WrapMode wrapModeS = default, WrapMode wrapModeT = default) => skin.GetTexture(componentName);
+
+            public ISample GetSample(ISampleInfo sampleInfo) => skin.GetSample(sampleInfo);
+
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => skin.GetConfig<TLookup, TValue>(lookup);
+        }
+
+        private class TestSkinProvider : ISkinSource
+        {
+            public const string TEXTURE_NAME = "some-texture";
+
+            public Drawable GetDrawableComponent(ISkinComponent component) => throw new NotImplementedException();
+
+            public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT) => componentName == TEXTURE_NAME ? Texture.WhitePixel : null;
+
+            public ISample GetSample(ISampleInfo sampleInfo) => throw new NotImplementedException();
+
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => throw new NotImplementedException();
+
+            public event Action SourceChanged
+            {
+                add { }
+                remove { }
+            }
+
+            public ISkin FindProvider(Func<ISkin, bool> lookupFunction) => lookupFunction(this) ? this : null;
+
+            public IEnumerable<ISkin> AllSources => new[] { this };
+        }
+    }
+}

osu.Game.Tests/Testing/TestSceneRulesetDependencies.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Tests.Testing
                 Dependencies.Get<TestRulesetConfigManager>() != null);
         }
 
-        private class TestRuleset : Ruleset
+        public class TestRuleset : Ruleset
         {
             public override string Description => string.Empty;
             public override string ShortName => string.Empty;

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

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
@@ -14,6 +15,8 @@ using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays;
 using osu.Game.Overlays.BeatmapListing;
 using osu.Game.Rulesets;
+using osu.Game.Scoring;
+using osu.Game.Users;
 
 namespace osu.Game.Tests.Visual.Online
 {
@@ -23,6 +26,8 @@ namespace osu.Game.Tests.Visual.Online
 
         private BeatmapListingOverlay overlay;
 
+        private BeatmapListingSearchControl searchControl => overlay.ChildrenOfType<BeatmapListingSearchControl>().Single();
+
         [BackgroundDependencyLoader]
         private void load()
         {
@@ -39,6 +44,16 @@ namespace osu.Game.Tests.Visual.Online
 
                 return true;
             };
+
+            AddStep("initialize dummy", () =>
+            {
+                // non-supporter user
+                ((DummyAPIAccess)API).LocalUser.Value = new User
+                {
+                    Username = "TestBot",
+                    Id = API.LocalUser.Value.Id + 1,
+                };
+            });
         }
 
         [Test]
@@ -58,13 +73,164 @@ namespace osu.Game.Tests.Visual.Online
             AddUntilStep("placeholder shown", () => overlay.ChildrenOfType<BeatmapListingOverlay.NotFoundDrawable>().SingleOrDefault()?.IsPresent == true);
         }
 
+        [Test]
+        public void TestUserWithoutSupporterUsesSupporterOnlyFiltersWithoutResults()
+        {
+            AddStep("fetch for 0 beatmaps", () => fetchFor());
+            AddStep("set dummy as non-supporter", () => ((DummyAPIAccess)API).LocalUser.Value.IsSupporter = false);
+
+            // only Rank Achieved filter
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            supporterRequiredPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            notFoundPlaceholderShown();
+
+            // only Played filter
+            setPlayedFilter(SearchPlayed.Played);
+            supporterRequiredPlaceholderShown();
+
+            setPlayedFilter(SearchPlayed.Any);
+            notFoundPlaceholderShown();
+
+            // both RankAchieved and Played filters
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            setPlayedFilter(SearchPlayed.Played);
+            supporterRequiredPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            setPlayedFilter(SearchPlayed.Any);
+            notFoundPlaceholderShown();
+        }
+
+        [Test]
+        public void TestUserWithSupporterUsesSupporterOnlyFiltersWithoutResults()
+        {
+            AddStep("fetch for 0 beatmaps", () => fetchFor());
+            AddStep("set dummy as supporter", () => ((DummyAPIAccess)API).LocalUser.Value.IsSupporter = true);
+
+            // only Rank Achieved filter
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            notFoundPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            notFoundPlaceholderShown();
+
+            // only Played filter
+            setPlayedFilter(SearchPlayed.Played);
+            notFoundPlaceholderShown();
+
+            setPlayedFilter(SearchPlayed.Any);
+            notFoundPlaceholderShown();
+
+            // both Rank Achieved and Played filters
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            setPlayedFilter(SearchPlayed.Played);
+            notFoundPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            setPlayedFilter(SearchPlayed.Any);
+            notFoundPlaceholderShown();
+        }
+
+        [Test]
+        public void TestUserWithoutSupporterUsesSupporterOnlyFiltersWithResults()
+        {
+            AddStep("fetch for 1 beatmap", () => fetchFor(CreateBeatmap(Ruleset.Value).BeatmapInfo.BeatmapSet));
+            AddStep("set dummy as non-supporter", () => ((DummyAPIAccess)API).LocalUser.Value.IsSupporter = false);
+
+            // only Rank Achieved filter
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            supporterRequiredPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            noPlaceholderShown();
+
+            // only Played filter
+            setPlayedFilter(SearchPlayed.Played);
+            supporterRequiredPlaceholderShown();
+
+            setPlayedFilter(SearchPlayed.Any);
+            noPlaceholderShown();
+
+            // both Rank Achieved and Played filters
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            setPlayedFilter(SearchPlayed.Played);
+            supporterRequiredPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            setPlayedFilter(SearchPlayed.Any);
+            noPlaceholderShown();
+        }
+
+        [Test]
+        public void TestUserWithSupporterUsesSupporterOnlyFiltersWithResults()
+        {
+            AddStep("fetch for 1 beatmap", () => fetchFor(CreateBeatmap(Ruleset.Value).BeatmapInfo.BeatmapSet));
+            AddStep("set dummy as supporter", () => ((DummyAPIAccess)API).LocalUser.Value.IsSupporter = true);
+
+            // only Rank Achieved filter
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            noPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            noPlaceholderShown();
+
+            // only Played filter
+            setPlayedFilter(SearchPlayed.Played);
+            noPlaceholderShown();
+
+            setPlayedFilter(SearchPlayed.Any);
+            noPlaceholderShown();
+
+            // both Rank Achieved and Played filters
+            setRankAchievedFilter(new[] { ScoreRank.XH });
+            setPlayedFilter(SearchPlayed.Played);
+            noPlaceholderShown();
+
+            setRankAchievedFilter(Array.Empty<ScoreRank>());
+            setPlayedFilter(SearchPlayed.Any);
+            noPlaceholderShown();
+        }
+
         private void fetchFor(params BeatmapSetInfo[] beatmaps)
         {
             setsForResponse.Clear();
             setsForResponse.AddRange(beatmaps.Select(b => new TestAPIBeatmapSet(b)));
 
             // trigger arbitrary change for fetching.
-            overlay.ChildrenOfType<BeatmapListingSearchControl>().Single().Query.TriggerChange();
+            searchControl.Query.TriggerChange();
+        }
+
+        private void setRankAchievedFilter(ScoreRank[] ranks)
+        {
+            AddStep($"set Rank Achieved filter to [{string.Join(',', ranks)}]", () =>
+            {
+                searchControl.Ranks.Clear();
+                searchControl.Ranks.AddRange(ranks);
+            });
+        }
+
+        private void setPlayedFilter(SearchPlayed played)
+        {
+            AddStep($"set Played filter to {played}", () => searchControl.Played.Value = played);
+        }
+
+        private void supporterRequiredPlaceholderShown()
+        {
+            AddUntilStep("\"supporter required\" placeholder shown", () => overlay.ChildrenOfType<BeatmapListingOverlay.SupporterRequiredDrawable>().SingleOrDefault()?.IsPresent == true);
+        }
+
+        private void notFoundPlaceholderShown()
+        {
+            AddUntilStep("\"no maps found\" placeholder shown", () => overlay.ChildrenOfType<BeatmapListingOverlay.NotFoundDrawable>().SingleOrDefault()?.IsPresent == true);
+        }
+
+        private void noPlaceholderShown()
+        {
+            AddUntilStep("no placeholder shown", () =>
+                !overlay.ChildrenOfType<BeatmapListingOverlay.SupporterRequiredDrawable>().Any()
+                && !overlay.ChildrenOfType<BeatmapListingOverlay.NotFoundDrawable>().Any());
         }
 
         private class TestAPIBeatmapSet : APIBeatmapSet

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

@@ -10,7 +10,6 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
-using osu.Game.Graphics.Sprites;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Mods;
 using osu.Game.Rulesets;
@@ -107,7 +106,6 @@ namespace osu.Game.Tests.Visual.UserInterface
             var conversionMods = osu.GetModsFor(ModType.Conversion);
 
             var noFailMod = osu.GetModsFor(ModType.DifficultyReduction).FirstOrDefault(m => m is OsuModNoFail);
-            var hiddenMod = harderMods.FirstOrDefault(m => m is OsuModHidden);
 
             var doubleTimeMod = harderMods.OfType<MultiMod>().FirstOrDefault(m => m.Mods.Any(a => a is OsuModDoubleTime));
 
@@ -120,8 +118,6 @@ namespace osu.Game.Tests.Visual.UserInterface
             testMultiMod(doubleTimeMod);
             testIncompatibleMods(easy, hardRock);
             testDeselectAll(easierMods.Where(m => !(m is MultiMod)));
-            testMultiplierTextColour(noFailMod, () => modSelect.LowMultiplierColour);
-            testMultiplierTextColour(hiddenMod, () => modSelect.HighMultiplierColour);
 
             testUnimplementedMod(targetMod);
         }
@@ -149,7 +145,7 @@ namespace osu.Game.Tests.Visual.UserInterface
 
             changeRuleset(0);
 
-            AddAssert("ensure mods still selected", () => modDisplay.Current.Value.Single(m => m is OsuModNoFail) != null);
+            AddAssert("ensure mods still selected", () => modDisplay.Current.Value.SingleOrDefault(m => m is OsuModNoFail) != null);
 
             changeRuleset(3);
 
@@ -316,17 +312,6 @@ namespace osu.Game.Tests.Visual.UserInterface
             AddAssert("check for no selection", () => !modSelect.SelectedMods.Value.Any());
         }
 
-        private void testMultiplierTextColour(Mod mod, Func<Color4> getCorrectColour)
-        {
-            checkLabelColor(() => Color4.White);
-            selectNext(mod);
-            AddWaitStep("wait for changing colour", 1);
-            checkLabelColor(getCorrectColour);
-            selectPrevious(mod);
-            AddWaitStep("wait for changing colour", 1);
-            checkLabelColor(() => Color4.White);
-        }
-
         private void testModsWithSameBaseType(Mod modA, Mod modB)
         {
             selectNext(modA);
@@ -348,7 +333,7 @@ namespace osu.Game.Tests.Visual.UserInterface
             AddAssert($"check {mod.Name} is selected", () =>
             {
                 var button = modSelect.GetModButton(mod);
-                return modSelect.SelectedMods.Value.Single(m => m.Name == mod.Name) != null && button.SelectedMod.GetType() == mod.GetType() && button.Selected;
+                return modSelect.SelectedMods.Value.SingleOrDefault(m => m.Name == mod.Name) != null && button.SelectedMod.GetType() == mod.GetType() && button.Selected;
             });
         }
 
@@ -370,8 +355,6 @@ namespace osu.Game.Tests.Visual.UserInterface
             });
         }
 
-        private void checkLabelColor(Func<Color4> getColour) => AddAssert("check label has expected colour", () => modSelect.MultiplierLabel.Colour.AverageColour == getColour());
-
         private void createDisplay(Func<TestModSelectOverlay> createOverlayFunc)
         {
             Children = new Drawable[]
@@ -408,7 +391,6 @@ namespace osu.Game.Tests.Visual.UserInterface
                 return section.ButtonsContainer.OfType<ModButton>().Single(b => b.Mods.Any(m => m.GetType() == mod.GetType()));
             }
 
-            public new OsuSpriteText MultiplierLabel => base.MultiplierLabel;
             public new TriangleButton DeselectAllButton => base.DeselectAllButton;
 
             public new Color4 LowMultiplierColour => base.LowMultiplierColour;

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

@@ -10,6 +10,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
 using osuTK;
@@ -59,7 +60,7 @@ namespace osu.Game.Tests.Visual.UserInterface
 
         private class Icon : Container, IHasTooltip
         {
-            public string TooltipText { get; }
+            public LocalisableString TooltipText { get; }
 
             public SpriteIcon SpriteIcon { get; }
 

osu.Game.Tournament/Screens/Editors/RoundEditorScreen.cs

@@ -147,7 +147,7 @@ namespace osu.Game.Tournament.Screens.Editors
                     [Resolved]
                     protected IAPIProvider API { get; private set; }
 
-                    private readonly Bindable<string> beatmapId = new Bindable<string>();
+                    private readonly Bindable<int?> beatmapId = new Bindable<int?>();
 
                     private readonly Bindable<string> mods = new Bindable<string>();
 
@@ -220,14 +220,12 @@ namespace osu.Game.Tournament.Screens.Editors
                     [BackgroundDependencyLoader]
                     private void load(RulesetStore rulesets)
                     {
-                        beatmapId.Value = Model.ID.ToString();
-                        beatmapId.BindValueChanged(idString =>
+                        beatmapId.Value = Model.ID;
+                        beatmapId.BindValueChanged(id =>
                         {
-                            int.TryParse(idString.NewValue, out var parsed);
+                            Model.ID = id.NewValue ?? 0;
 
-                            Model.ID = parsed;
-
-                            if (idString.NewValue != idString.OldValue)
+                            if (id.NewValue != id.OldValue)
                                 Model.BeatmapInfo = null;
 
                             if (Model.BeatmapInfo != null)

osu.Game.Tournament/Screens/Editors/SeedingEditorScreen.cs

@@ -147,7 +147,7 @@ namespace osu.Game.Tournament.Screens.Editors
                     [Resolved]
                     protected IAPIProvider API { get; private set; }
 
-                    private readonly Bindable<string> beatmapId = new Bindable<string>();
+                    private readonly Bindable<int?> beatmapId = new Bindable<int?>();
 
                     private readonly Bindable<string> score = new Bindable<string>();
 
@@ -228,16 +228,12 @@ namespace osu.Game.Tournament.Screens.Editors
                     [BackgroundDependencyLoader]
                     private void load(RulesetStore rulesets)
                     {
-                        beatmapId.Value = Model.ID.ToString();
-                        beatmapId.BindValueChanged(idString =>
+                        beatmapId.Value = Model.ID;
+                        beatmapId.BindValueChanged(id =>
                         {
-                            int parsed;
+                            Model.ID = id.NewValue ?? 0;
 
-                            int.TryParse(idString.NewValue, out parsed);
-
-                            Model.ID = parsed;
-
-                            if (idString.NewValue != idString.OldValue)
+                            if (id.NewValue != id.OldValue)
                                 Model.BeatmapInfo = null;
 
                             if (Model.BeatmapInfo != null)

osu.Game.Tournament/Screens/Editors/TeamEditorScreen.cs

@@ -214,7 +214,7 @@ namespace osu.Game.Tournament.Screens.Editors
                     [Resolved]
                     private TournamentGameBase game { get; set; }
 
-                    private readonly Bindable<string> userId = new Bindable<string>();
+                    private readonly Bindable<int?> userId = new Bindable<int?>();
 
                     private readonly Container drawableContainer;
 
@@ -278,14 +278,12 @@ namespace osu.Game.Tournament.Screens.Editors
                     [BackgroundDependencyLoader]
                     private void load()
                     {
-                        userId.Value = user.Id.ToString();
-                        userId.BindValueChanged(idString =>
+                        userId.Value = user.Id;
+                        userId.BindValueChanged(id =>
                         {
-                            int.TryParse(idString.NewValue, out var parsed);
+                            user.Id = id.NewValue ?? 0;
 
-                            user.Id = parsed;
-
-                            if (idString.NewValue != idString.OldValue)
+                            if (id.NewValue != id.OldValue)
                                 user.Username = string.Empty;
 
                             if (!string.IsNullOrEmpty(user.Username))

osu.Game/Beatmaps/BeatmapManager.cs

@@ -196,8 +196,6 @@ namespace osu.Game.Beatmaps
         {
             var beatmapIds = beatmapSet.Beatmaps.Where(b => b.OnlineBeatmapID.HasValue).Select(b => b.OnlineBeatmapID).ToList();
 
-            LogForModel(beatmapSet, $"Validating online IDs for {beatmapSet.Beatmaps.Count} beatmaps...");
-
             // ensure all IDs are unique
             if (beatmapIds.GroupBy(b => b).Any(g => g.Count() > 1))
             {
@@ -324,6 +322,14 @@ namespace osu.Game.Beatmaps
         /// <returns>The first result for the provided query, or null if no results were found.</returns>
         public BeatmapSetInfo QueryBeatmapSet(Expression<Func<BeatmapSetInfo, bool>> query) => beatmaps.ConsumableItems.AsNoTracking().FirstOrDefault(query);
 
+        protected override bool CanSkipImport(BeatmapSetInfo existing, BeatmapSetInfo import)
+        {
+            if (!base.CanReuseExisting(existing, import))
+                return false;
+
+            return existing.Beatmaps.Any(b => b.OnlineBeatmapID != null);
+        }
+
         protected override bool CanReuseExisting(BeatmapSetInfo existing, BeatmapSetInfo import)
         {
             if (!base.CanReuseExisting(existing, import))

osu.Game/Beatmaps/BeatmapManager_BeatmapOnlineLookupQueue.cs

@@ -48,7 +48,6 @@ namespace osu.Game.Beatmaps
 
             public Task UpdateAsync(BeatmapSetInfo beatmapSet, CancellationToken cancellationToken)
             {
-                LogForModel(beatmapSet, "Performing online lookups...");
                 return Task.WhenAll(beatmapSet.Beatmaps.Select(b => UpdateAsync(beatmapSet, b, cancellationToken)).ToArray());
             }
 

osu.Game/Beatmaps/WorkingBeatmap.cs

@@ -133,6 +133,9 @@ namespace osu.Game.Beatmaps
 
                 IBeatmapProcessor processor = rulesetInstance.CreateBeatmapProcessor(converted);
 
+                foreach (var mod in mods.OfType<IApplicableToBeatmapProcessor>())
+                    mod.ApplyToBeatmapProcessor(processor);
+
                 processor?.PreProcess();
 
                 // Compute default values for hitobjects, including creating nested hitobjects in-case they're needed

osu.Game/Collections/CollectionManager.cs

@@ -35,6 +35,7 @@ namespace osu.Game.Collections
         private const int database_version = 30000000;
 
         private const string database_name = "collection.db";
+        private const string database_backup_name = "collection.db.bak";
 
         public readonly BindableList<BeatmapCollection> Collections = new BindableList<BeatmapCollection>();
 
@@ -56,6 +57,17 @@ namespace osu.Game.Collections
         {
             Collections.CollectionChanged += collectionsChanged;
 
+            if (storage.Exists(database_backup_name))
+            {
+                // If a backup file exists, it means the previous write operation didn't run to completion.
+                // Always prefer the backup file in such a case as it's the most recent copy that is guaranteed to not be malformed.
+                //
+                // The database is saved 100ms after any change, and again when the game is closed, so there shouldn't be a large diff between the two files in the worst case.
+                if (storage.Exists(database_name))
+                    storage.Delete(database_name);
+                File.Copy(storage.GetFullPath(database_backup_name), storage.GetFullPath(database_name));
+            }
+
             if (storage.Exists(database_name))
             {
                 List<BeatmapCollection> beatmapCollections;
@@ -68,7 +80,7 @@ namespace osu.Game.Collections
             }
         }
 
-        private void collectionsChanged(object sender, NotifyCollectionChangedEventArgs e)
+        private void collectionsChanged(object sender, NotifyCollectionChangedEventArgs e) => Schedule(() =>
         {
             switch (e.Action)
             {
@@ -92,7 +104,7 @@ namespace osu.Game.Collections
             }
 
             backgroundSave();
-        }
+        });
 
         /// <summary>
         /// Set an endpoint for notifications to be posted to.
@@ -257,27 +269,50 @@ namespace osu.Game.Collections
             {
                 Interlocked.Increment(ref lastSave);
 
+                // This is NOT thread-safe!!
                 try
                 {
-                    // This is NOT thread-safe!!
+                    var tempPath = Path.GetTempFileName();
 
-                    using (var sw = new SerializationWriter(storage.GetStream(database_name, FileAccess.Write)))
+                    using (var ms = new MemoryStream())
                     {
-                        sw.Write(database_version);
-
-                        var collectionsCopy = Collections.ToArray();
-                        sw.Write(collectionsCopy.Length);
-
-                        foreach (var c in collectionsCopy)
+                        using (var sw = new SerializationWriter(ms, true))
                         {
-                            sw.Write(c.Name.Value);
+                            sw.Write(database_version);
 
-                            var beatmapsCopy = c.Beatmaps.ToArray();
-                            sw.Write(beatmapsCopy.Length);
+                            var collectionsCopy = Collections.ToArray();
+                            sw.Write(collectionsCopy.Length);
 
-                            foreach (var b in beatmapsCopy)
-                                sw.Write(b.MD5Hash);
+                            foreach (var c in collectionsCopy)
+                            {
+                                sw.Write(c.Name.Value);
+
+                                var beatmapsCopy = c.Beatmaps.ToArray();
+                                sw.Write(beatmapsCopy.Length);
+
+                                foreach (var b in beatmapsCopy)
+                                    sw.Write(b.MD5Hash);
+                            }
                         }
+
+                        using (var fs = File.OpenWrite(tempPath))
+                            ms.WriteTo(fs);
+
+                        var databasePath = storage.GetFullPath(database_name);
+                        var databaseBackupPath = storage.GetFullPath(database_backup_name);
+
+                        // Back up the existing database, clearing any existing backup.
+                        if (File.Exists(databaseBackupPath))
+                            File.Delete(databaseBackupPath);
+                        if (File.Exists(databasePath))
+                            File.Move(databasePath, databaseBackupPath);
+
+                        // Move the new database in-place of the existing one.
+                        File.Move(tempPath, databasePath);
+
+                        // If everything succeeded up to this point, remove the backup file.
+                        if (File.Exists(databaseBackupPath))
+                            File.Delete(databaseBackupPath);
                     }
 
                     if (saveFailures < 10)

osu.Game/Configuration/SettingSourceAttribute.cs

@@ -12,6 +12,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Extensions.TypeExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Localisation;
+using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Settings;
 
 namespace osu.Game.Configuration
@@ -30,7 +31,7 @@ namespace osu.Game.Configuration
     {
         public LocalisableString Label { get; }
 
-        public string Description { get; }
+        public LocalisableString Description { get; }
 
         public int? OrderPosition { get; }
 
@@ -149,7 +150,7 @@ namespace osu.Game.Configuration
                         break;
 
                     case IBindable bindable:
-                        var dropdownType = typeof(SettingsEnumDropdown<>).MakeGenericType(bindable.GetType().GetGenericArguments()[0]);
+                        var dropdownType = typeof(ModSettingsEnumDropdown<>).MakeGenericType(bindable.GetType().GetGenericArguments()[0]);
                         var dropdown = (Drawable)Activator.CreateInstance(dropdownType);
 
                         dropdownType.GetProperty(nameof(SettingsDropdown<object>.LabelText))?.SetValue(dropdown, attr.Label);
@@ -183,5 +184,17 @@ namespace osu.Game.Configuration
             => obj.GetSettingsSourceProperties()
                   .OrderBy(attr => attr.Item1)
                   .ToArray();
+
+        private class ModSettingsEnumDropdown<T> : SettingsEnumDropdown<T>
+            where T : struct, Enum
+        {
+            protected override OsuDropdown<T> CreateDropdown() => new ModDropdownControl();
+
+            private class ModDropdownControl : DropdownControl
+            {
+                // Set menu's max height low enough to workaround nested scroll issues (see https://github.com/ppy/osu-framework/issues/4536).
+                protected override DropdownMenu CreateMenu() => base.CreateMenu().With(m => m.MaxHeight = 100);
+            }
+        }
     }
 }

osu.Game/Database/ArchiveModelManager.cs

@@ -78,7 +78,7 @@ namespace osu.Game.Database
 
         private readonly Bindable<WeakReference<TModel>> itemRemoved = new Bindable<WeakReference<TModel>>();
 
-        public virtual IEnumerable<string> HandledExtensions => new[] { ".zip" };
+        public virtual IEnumerable<string> HandledExtensions => new[] { @".zip" };
 
         protected readonly FileStore Files;
 
@@ -99,7 +99,7 @@ namespace osu.Game.Database
             ModelStore.ItemUpdated += item => handleEvent(() => itemUpdated.Value = new WeakReference<TModel>(item));
             ModelStore.ItemRemoved += item => handleEvent(() => itemRemoved.Value = new WeakReference<TModel>(item));
 
-            exportStorage = storage.GetStorageForDirectory("exports");
+            exportStorage = storage.GetStorageForDirectory(@"exports");
 
             Files = new FileStore(contextFactory, storage);
 
@@ -282,7 +282,7 @@ namespace osu.Game.Database
             }
             catch (Exception e)
             {
-                LogForModel(model, $"Model creation of {archive.Name} failed.", e);
+                LogForModel(model, @$"Model creation of {archive.Name} failed.", e);
                 return null;
             }
 
@@ -309,6 +309,12 @@ namespace osu.Game.Database
                 Logger.Log($"{prefix} {message}", LoggingTarget.Database);
         }
 
+        /// <summary>
+        /// Whether the implementation overrides <see cref="ComputeHash"/> with a custom implementation.
+        /// Custom hash implementations must bypass the early exit in the import flow (see <see cref="computeHashFast"/> usage).
+        /// </summary>
+        protected virtual bool HasCustomHashFunction => false;
+
         /// <summary>
         /// Create a SHA-2 hash from the provided archive based on file content of all files matching <see cref="HashableFileTypes"/>.
         /// </summary>
@@ -317,7 +323,11 @@ namespace osu.Game.Database
         /// </remarks>
         protected virtual string ComputeHash(TModel item, ArchiveReader reader = null)
         {
-            // for now, concatenate all .osu files in the set to create a unique hash.
+            if (reader != null)
+                // fast hashing for cases where the item's files may not be populated.
+                return computeHashFast(reader);
+
+            // for now, concatenate all hashable files in the set to create a unique hash.
             MemoryStream hashable = new MemoryStream();
 
             foreach (TFileModel file in item.Files.Where(f => HashableFileTypes.Any(ext => f.Filename.EndsWith(ext, StringComparison.OrdinalIgnoreCase))).OrderBy(f => f.Filename))
@@ -329,9 +339,6 @@ namespace osu.Game.Database
             if (hashable.Length > 0)
                 return hashable.ComputeSHA2Hash();
 
-            if (reader != null)
-                return reader.Name.ComputeSHA2Hash();
-
             return item.Hash;
         }
 
@@ -348,19 +355,48 @@ namespace osu.Game.Database
 
             delayEvents();
 
+            bool checkedExisting = false;
+            TModel existing = null;
+
+            if (archive != null && !HasCustomHashFunction)
+            {
+                // this is a fast bail condition to improve large import performance.
+                item.Hash = computeHashFast(archive);
+
+                checkedExisting = true;
+                existing = CheckForExisting(item);
+
+                if (existing != null)
+                {
+                    // bare minimum comparisons
+                    //
+                    // note that this should really be checking filesizes on disk (of existing files) for some degree of sanity.
+                    // or alternatively doing a faster hash check. either of these require database changes and reprocessing of existing files.
+                    if (CanSkipImport(existing, item) &&
+                        getFilenames(existing.Files).SequenceEqual(getShortenedFilenames(archive).Select(p => p.shortened).OrderBy(f => f)))
+                    {
+                        LogForModel(item, @$"Found existing (optimised) {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
+                        Undelete(existing);
+                        return existing;
+                    }
+
+                    LogForModel(item, @"Found existing (optimised) but failed pre-check.");
+                }
+            }
+
             void rollback()
             {
                 if (!Delete(item))
                 {
                     // We may have not yet added the model to the underlying table, but should still clean up files.
-                    LogForModel(item, "Dereferencing files for incomplete import.");
+                    LogForModel(item, @"Dereferencing files for incomplete import.");
                     Files.Dereference(item.Files.Select(f => f.FileInfo).ToArray());
                 }
             }
 
             try
             {
-                LogForModel(item, "Beginning import...");
+                LogForModel(item, @"Beginning import...");
 
                 item.Files = archive != null ? createFileInfos(archive, Files) : new List<TFileModel>();
                 item.Hash = ComputeHash(item, archive);
@@ -371,22 +407,24 @@ namespace osu.Game.Database
                 {
                     try
                     {
-                        if (!write.IsTransactionLeader) throw new InvalidOperationException($"Ensure there is no parent transaction so errors can correctly be handled by {this}");
+                        if (!write.IsTransactionLeader) throw new InvalidOperationException(@$"Ensure there is no parent transaction so errors can correctly be handled by {this}");
 
-                        var existing = CheckForExisting(item);
+                        if (!checkedExisting)
+                            existing = CheckForExisting(item);
 
                         if (existing != null)
                         {
                             if (CanReuseExisting(existing, item))
                             {
                                 Undelete(existing);
-                                LogForModel(item, $"Found existing {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
+                                LogForModel(item, @$"Found existing {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
                                 // existing item will be used; rollback new import and exit early.
                                 rollback();
                                 flushEvents(true);
                                 return existing;
                             }
 
+                            LogForModel(item, @"Found existing but failed re-use check.");
                             Delete(existing);
                             ModelStore.PurgeDeletable(s => s.ID == existing.ID);
                         }
@@ -403,12 +441,12 @@ namespace osu.Game.Database
                     }
                 }
 
-                LogForModel(item, "Import successfully completed!");
+                LogForModel(item, @"Import successfully completed!");
             }
             catch (Exception e)
             {
                 if (!(e is TaskCanceledException))
-                    LogForModel(item, "Database import or population failed and has been rolled back.", e);
+                    LogForModel(item, @"Database import or population failed and has been rolled back.", e);
 
                 rollback();
                 flushEvents(false);
@@ -428,7 +466,7 @@ namespace osu.Game.Database
             var retrievedItem = ModelStore.ConsumableItems.FirstOrDefault(s => s.ID == item.ID);
 
             if (retrievedItem == null)
-                throw new ArgumentException("Specified model could not be found", nameof(item));
+                throw new ArgumentException(@"Specified model could not be found", nameof(item));
 
             using (var outputStream = exportStorage.GetStream($"{getValidFilename(item.ToString())}{HandledExtensions.First()}", FileAccess.Write, FileMode.Create))
                 ExportModelTo(retrievedItem, outputStream);
@@ -637,6 +675,22 @@ namespace osu.Game.Database
             }
         }
 
+        private string computeHashFast(ArchiveReader reader)
+        {
+            MemoryStream hashable = new MemoryStream();
+
+            foreach (var file in reader.Filenames.Where(f => HashableFileTypes.Any(ext => f.EndsWith(ext, StringComparison.OrdinalIgnoreCase))).OrderBy(f => f))
+            {
+                using (Stream s = reader.GetStream(file))
+                    s.CopyTo(hashable);
+            }
+
+            if (hashable.Length > 0)
+                return hashable.ComputeSHA2Hash();
+
+            return reader.Name.ComputeSHA2Hash();
+        }
+
         /// <summary>
         /// Create all required <see cref="IO.FileInfo"/>s for the provided archive, adding them to the global file store.
         /// </summary>
@@ -644,18 +698,14 @@ namespace osu.Game.Database
         {
             var fileInfos = new List<TFileModel>();
 
-            string prefix = reader.Filenames.GetCommonPrefix();
-            if (!(prefix.EndsWith('/') || prefix.EndsWith('\\')))
-                prefix = string.Empty;
-
             // import files to manager
-            foreach (string file in reader.Filenames)
+            foreach (var filenames in getShortenedFilenames(reader))
             {
-                using (Stream s = reader.GetStream(file))
+                using (Stream s = reader.GetStream(filenames.original))
                 {
                     fileInfos.Add(new TFileModel
                     {
-                        Filename = file.Substring(prefix.Length).ToStandardisedPath(),
+                        Filename = filenames.shortened,
                         FileInfo = files.Add(s)
                     });
                 }
@@ -664,6 +714,17 @@ namespace osu.Game.Database
             return fileInfos;
         }
 
+        private IEnumerable<(string original, string shortened)> getShortenedFilenames(ArchiveReader reader)
+        {
+            string prefix = reader.Filenames.GetCommonPrefix();
+            if (!(prefix.EndsWith('/') || prefix.EndsWith('\\')))
+                prefix = string.Empty;
+
+            // import files to manager
+            foreach (string file in reader.Filenames)
+                yield return (file, file.Substring(prefix.Length).ToStandardisedPath());
+        }
+
         #region osu-stable import
 
         /// <summary>
@@ -696,7 +757,7 @@ namespace osu.Game.Database
             {
                 string fullPath = storage.GetFullPath(ImportFromStablePath);
 
-                Logger.Log($"Folder \"{fullPath}\" not available in the target osu!stable installation to import {HumanisedModelName}s.", LoggingTarget.Information, LogLevel.Error);
+                Logger.Log(@$"Folder ""{fullPath}"" not available in the target osu!stable installation to import {HumanisedModelName}s.", LoggingTarget.Information, LogLevel.Error);
                 return Task.CompletedTask;
             }
 
@@ -727,7 +788,7 @@ namespace osu.Game.Database
         /// <param name="model">The model to populate.</param>
         /// <param name="archive">The archive to use as a reference for population. May be null.</param>
         /// <param name="cancellationToken">An optional cancellation token.</param>
-        protected virtual Task Populate(TModel model, [CanBeNull] ArchiveReader archive, CancellationToken cancellationToken = default) => Task.CompletedTask;
+        protected abstract Task Populate(TModel model, [CanBeNull] ArchiveReader archive, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Perform any final actions before the import to database executes.
@@ -744,6 +805,15 @@ namespace osu.Game.Database
         /// <returns>An existing model which matches the criteria to skip importing, else null.</returns>
         protected TModel CheckForExisting(TModel model) => model.Hash == null ? null : ModelStore.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
 
+        /// <summary>
+        /// Whether inport can be skipped after finding an existing import early in the process.
+        /// Only valid when <see cref="ComputeHash"/> is not overridden.
+        /// </summary>
+        /// <param name="existing">The existing model.</param>
+        /// <param name="import">The newly imported model.</param>
+        /// <returns>Whether to skip this import completely.</returns>
+        protected virtual bool CanSkipImport(TModel existing, TModel import) => true;
+
         /// <summary>
         /// After an existing <typeparamref name="TModel"/> is found during an import process, the default behaviour is to use/restore the existing
         /// item and skip the import. This method allows changing that behaviour.
@@ -771,7 +841,7 @@ namespace osu.Game.Database
 
         private DbSet<TModel> queryModel() => ContextFactory.Get().Set<TModel>();
 
-        protected virtual string HumanisedModelName => $"{typeof(TModel).Name.Replace("Info", "").ToLower()}";
+        protected virtual string HumanisedModelName => $"{typeof(TModel).Name.Replace(@"Info", "").ToLower()}";
 
         #region Event handling / delaying
 

osu.Game/Database/RealmContextFactory.cs

@@ -26,6 +26,11 @@ namespace osu.Game.Database
         /// </summary>
         private readonly object writeLock = new object();
 
+        /// <summary>
+        /// Lock object which is held during <see cref="BlockAllOperations"/> sections.
+        /// </summary>
+        private readonly SemaphoreSlim blockingLock = new SemaphoreSlim(1);
+
         private static readonly GlobalStatistic<int> reads = GlobalStatistics.Get<int>("Realm", "Get (Read)");
         private static readonly GlobalStatistic<int> writes = GlobalStatistics.Get<int>("Realm", "Get (Write)");
         private static readonly GlobalStatistic<int> refreshes = GlobalStatistics.Get<int>("Realm", "Dirty Refreshes");
@@ -33,17 +38,12 @@ namespace osu.Game.Database
         private static readonly GlobalStatistic<int> pending_writes = GlobalStatistics.Get<int>("Realm", "Pending writes");
         private static readonly GlobalStatistic<int> active_usages = GlobalStatistics.Get<int>("Realm", "Active usages");
 
-        private readonly ManualResetEventSlim blockingResetEvent = new ManualResetEventSlim(true);
-
         private Realm context;
 
         public Realm Context
         {
             get
             {
-                if (IsDisposed)
-                    throw new InvalidOperationException($"Attempted to access {nameof(Context)} on a disposed context factory");
-
                 if (context == null)
                 {
                     context = createContext();
@@ -64,7 +64,7 @@ namespace osu.Game.Database
         public RealmUsage GetForRead()
         {
             reads.Value++;
-            return new RealmUsage(this);
+            return new RealmUsage(createContext());
         }
 
         public RealmWriteUsage GetForWrite()
@@ -73,8 +73,28 @@ namespace osu.Game.Database
             pending_writes.Value++;
 
             Monitor.Enter(writeLock);
+            return new RealmWriteUsage(createContext(), writeComplete);
+        }
 
-            return new RealmWriteUsage(this);
+        /// <summary>
+        /// Flush any active contexts and block any further writes.
+        /// </summary>
+        /// <remarks>
+        /// This should be used in places we need to ensure no ongoing reads/writes are occurring with realm.
+        /// ie. to move the realm backing file to a new location.
+        /// </remarks>
+        /// <returns>An <see cref="IDisposable"/> which should be disposed to end the blocking section.</returns>
+        public IDisposable BlockAllOperations()
+        {
+            if (IsDisposed)
+                throw new ObjectDisposedException(nameof(RealmContextFactory));
+
+            blockingLock.Wait();
+            flushContexts();
+
+            return new InvokeOnDisposal<RealmContextFactory>(this, endBlockingSection);
+
+            static void endBlockingSection(RealmContextFactory factory) => factory.blockingLock.Release();
         }
 
         protected override void Update()
@@ -87,15 +107,31 @@ namespace osu.Game.Database
 
         private Realm createContext()
         {
-            blockingResetEvent.Wait();
-
-            contexts_created.Value++;
-
-            return Realm.GetInstance(new RealmConfiguration(storage.GetFullPath($"{database_name}.realm", true))
+            try
             {
-                SchemaVersion = schema_version,
-                MigrationCallback = onMigration,
-            });
+                if (IsDisposed)
+                    throw new ObjectDisposedException(nameof(RealmContextFactory));
+
+                blockingLock.Wait();
+
+                contexts_created.Value++;
+
+                return Realm.GetInstance(new RealmConfiguration(storage.GetFullPath($"{database_name}.realm", true))
+                {
+                    SchemaVersion = schema_version,
+                    MigrationCallback = onMigration,
+                });
+            }
+            finally
+            {
+                blockingLock.Release();
+            }
+        }
+
+        private void writeComplete()
+        {
+            Monitor.Exit(writeLock);
+            pending_writes.Value--;
         }
 
         private void onMigration(Migration migration, ulong lastSchemaVersion)
@@ -109,26 +145,6 @@ namespace osu.Game.Database
             }
         }
 
-        protected override void Dispose(bool isDisposing)
-        {
-            base.Dispose(isDisposing);
-
-            BlockAllOperations();
-        }
-
-        public IDisposable BlockAllOperations()
-        {
-            blockingResetEvent.Reset();
-            flushContexts();
-
-            return new InvokeOnDisposal<RealmContextFactory>(this, r => endBlockingSection());
-        }
-
-        private void endBlockingSection()
-        {
-            blockingResetEvent.Set();
-        }
-
         private void flushContexts()
         {
             var previousContext = context;
@@ -141,6 +157,18 @@ namespace osu.Game.Database
             previousContext?.Dispose();
         }
 
+        protected override void Dispose(bool isDisposing)
+        {
+            if (!IsDisposed)
+            {
+                // intentionally block all operations indefinitely. this ensures that nothing can start consuming a new context after disposal.
+                BlockAllOperations();
+                blockingLock?.Dispose();
+            }
+
+            base.Dispose(isDisposing);
+        }
+
         /// <summary>
         /// A usage of realm from an arbitrary thread.
         /// </summary>
@@ -148,13 +176,10 @@ namespace osu.Game.Database
         {
             public readonly Realm Realm;
 
-            protected readonly RealmContextFactory Factory;
-
-            internal RealmUsage(RealmContextFactory factory)
+            internal RealmUsage(Realm context)
             {
                 active_usages.Value++;
-                Factory = factory;
-                Realm = factory.createContext();
+                Realm = context;
             }
 
             /// <summary>
@@ -172,11 +197,13 @@ namespace osu.Game.Database
         /// </summary>
         public class RealmWriteUsage : RealmUsage
         {
+            private readonly Action onWriteComplete;
             private readonly Transaction transaction;
 
-            internal RealmWriteUsage(RealmContextFactory factory)
-                : base(factory)
+            internal RealmWriteUsage(Realm context, Action onWriteComplete)
+                : base(context)
             {
+                this.onWriteComplete = onWriteComplete;
                 transaction = Realm.BeginWrite();
             }
 
@@ -200,8 +227,7 @@ namespace osu.Game.Database
 
                 base.Dispose();
 
-                Monitor.Exit(Factory.writeLock);
-                pending_writes.Value--;
+                onWriteComplete();
             }
         }
     }

osu.Game/Graphics/Containers/Markdown/OsuMarkdownImage.cs

@@ -4,12 +4,13 @@
 using Markdig.Syntax.Inlines;
 using osu.Framework.Graphics.Containers.Markdown;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 
 namespace osu.Game.Graphics.Containers.Markdown
 {
     public class OsuMarkdownImage : MarkdownImage, IHasTooltip
     {
-        public string TooltipText { get; }
+        public LocalisableString TooltipText { get; }
 
         public OsuMarkdownImage(LinkInline linkInline)
             : base(linkInline.Url)

osu.Game/Graphics/Containers/OsuClickableContainer.cs

@@ -5,6 +5,7 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 using osu.Game.Graphics.UserInterface;
 
 namespace osu.Game.Graphics.Containers
@@ -24,7 +25,7 @@ namespace osu.Game.Graphics.Containers
             this.sampleSet = sampleSet;
         }
 
-        public virtual string TooltipText { get; set; }
+        public virtual LocalisableString TooltipText { get; set; }
 
         [BackgroundDependencyLoader]
         private void load()

osu.Game/Graphics/Cursor/OsuTooltipContainer.cs

@@ -9,6 +9,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Effects;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Localisation;
 using osu.Game.Graphics.Sprites;
 
 namespace osu.Game.Graphics.Cursor
@@ -32,7 +33,7 @@ namespace osu.Game.Graphics.Cursor
 
             public override bool SetContent(object content)
             {
-                if (!(content is string contentString))
+                if (!(content is LocalisableString contentString))
                     return false;
 
                 if (contentString == text.Text) return true;

osu.Game/Graphics/UserInterface/ExternalLinkButton.cs

@@ -7,6 +7,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Framework.Platform;
 using osuTK;
 using osuTK.Graphics;
@@ -58,6 +59,6 @@ namespace osu.Game.Graphics.UserInterface
             return true;
         }
 
-        public string TooltipText => "view in browser";
+        public LocalisableString TooltipText => "view in browser";
     }
 }

osu.Game/Graphics/UserInterface/OsuPasswordTextBox.cs

@@ -12,6 +12,7 @@ using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Input;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Framework.Platform;
 
 namespace osu.Game.Graphics.UserInterface
@@ -105,7 +106,7 @@ namespace osu.Game.Graphics.UserInterface
 
         private class CapsWarning : SpriteIcon, IHasTooltip
         {
-            public string TooltipText => @"caps lock is active";
+            public LocalisableString TooltipText => "caps lock is active";
 
             public CapsWarning()
             {

osu.Game/Graphics/UserInterface/OsuSliderBar.cs

@@ -14,6 +14,7 @@ using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 
 namespace osu.Game.Graphics.UserInterface
 {
@@ -34,7 +35,7 @@ namespace osu.Game.Graphics.UserInterface
         private readonly Box rightBox;
         private readonly Container nubContainer;
 
-        public virtual string TooltipText { get; private set; }
+        public virtual LocalisableString TooltipText { get; private set; }
 
         /// <summary>
         /// Whether to format the tooltip as a percentage or the actual value.

osu.Game/IO/Legacy/SerializationWriter.cs

@@ -18,8 +18,8 @@ namespace osu.Game.IO.Legacy
     /// handle null strings and simplify use with ISerializable. </summary>
     public class SerializationWriter : BinaryWriter
     {
-        public SerializationWriter(Stream s)
-            : base(s, Encoding.UTF8)
+        public SerializationWriter(Stream s, bool leaveOpen = false)
+            : base(s, Encoding.UTF8, leaveOpen)
         {
         }
 

osu.Game/Localisation/Language.cs

@@ -103,8 +103,11 @@ namespace osu.Game.Localisation
         [Description(@"简体中文")]
         zh,
 
-        [Description(@"繁體中文（香港）")]
-        zh_hk,
+        // Traditional Chinese (Hong Kong) is listed in web sources but has no associated localisations,
+        // and was wrongly falling back to Simplified Chinese.
+        // Can be revisited if localisations ever arrive.
+        // [Description(@"繁體中文（香港）")]
+        // zh_hk,
 
         [Description(@"繁體中文（台灣）")]
         zh_tw

osu.Game/Online/Leaderboards/LeaderboardScore.cs

@@ -13,6 +13,7 @@ using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.Sprites;
@@ -295,7 +296,7 @@ namespace osu.Game.Online.Leaderboards
 
             public override bool Contains(Vector2 screenSpacePos) => content.Contains(screenSpacePos);
 
-            public string TooltipText { get; }
+            public LocalisableString TooltipText { get; }
 
             public ScoreComponentLabel(LeaderboardScoreStatistic statistic)
             {
@@ -365,7 +366,7 @@ namespace osu.Game.Online.Leaderboards
                 };
             }
 
-            public string TooltipText { get; }
+            public LocalisableString TooltipText { get; }
         }
 
         public class LeaderboardScoreStatistic

osu.Game/OsuGameBase.cs

@@ -24,6 +24,7 @@ using osu.Framework.Graphics.Performance;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Input;
 using osu.Framework.Logging;
+using osu.Framework.Threading;
 using osu.Game.Audio;
 using osu.Game.Database;
 using osu.Game.Input;
@@ -156,6 +157,8 @@ namespace osu.Game
 
         private readonly BindableNumber<double> globalTrackVolumeAdjust = new BindableNumber<double>(GLOBAL_TRACK_VOLUME_ADJUST);
 
+        private IBindable<GameThreadState> updateThreadState;
+
         public OsuGameBase()
         {
             UseDevelopmentServer = DebugUtils.IsDebugBuild;
@@ -182,6 +185,10 @@ namespace osu.Game
             dependencies.Cache(contextFactory = new DatabaseContextFactory(Storage));
 
             dependencies.Cache(realmFactory = new RealmContextFactory(Storage));
+
+            updateThreadState = Host.UpdateThread.State.GetBoundCopy();
+            updateThreadState.BindValueChanged(updateThreadStateChanged);
+
             AddInternal(realmFactory);
 
             dependencies.CacheAs(Storage);
@@ -356,6 +363,23 @@ namespace osu.Game
             Ruleset.BindValueChanged(onRulesetChanged);
         }
 
+        private IDisposable blocking;
+
+        private void updateThreadStateChanged(ValueChangedEvent<GameThreadState> state)
+        {
+            switch (state.NewValue)
+            {
+                case GameThreadState.Running:
+                    blocking?.Dispose();
+                    blocking = null;
+                    break;
+
+                case GameThreadState.Paused:
+                    blocking = realmFactory.BlockAllOperations();
+                    break;
+            }
+        }
+
         protected override void LoadComplete()
         {
             base.LoadComplete();

osu.Game/Overlays/BeatmapListing/BeatmapListingFilterControl.cs

@@ -10,11 +10,13 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Effects;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Localisation;
 using osu.Framework.Threading;
 using osu.Game.Beatmaps;
 using osu.Game.Online.API;
 using osu.Game.Online.API.Requests;
 using osu.Game.Rulesets;
+using osu.Game.Resources.Localisation.Web;
 using osuTK;
 using osuTK.Graphics;
 
@@ -23,9 +25,9 @@ namespace osu.Game.Overlays.BeatmapListing
     public class BeatmapListingFilterControl : CompositeDrawable
     {
         /// <summary>
-        /// Fired when a search finishes. Contains only new items in the case of pagination.
+        /// Fired when a search finishes.
         /// </summary>
-        public Action<List<BeatmapSetInfo>> SearchFinished;
+        public Action<SearchResult> SearchFinished;
 
         /// <summary>
         /// Fired when search criteria change.
@@ -212,7 +214,25 @@ namespace osu.Game.Overlays.BeatmapListing
                 lastResponse = response;
                 getSetsRequest = null;
 
-                SearchFinished?.Invoke(sets);
+                // check if a non-supporter used supporter-only filters
+                if (!api.LocalUser.Value.IsSupporter)
+                {
+                    List<LocalisableString> filters = new List<LocalisableString>();
+
+                    if (searchControl.Played.Value != SearchPlayed.Any)
+                        filters.Add(BeatmapsStrings.ListingSearchFiltersPlayed);
+
+                    if (searchControl.Ranks.Any())
+                        filters.Add(BeatmapsStrings.ListingSearchFiltersRank);
+
+                    if (filters.Any())
+                    {
+                        SearchFinished?.Invoke(SearchResult.SupporterOnlyFilters(filters));
+                        return;
+                    }
+                }
+
+                SearchFinished?.Invoke(SearchResult.ResultsReturned(sets));
             };
 
             api.Queue(getSetsRequest);
@@ -237,5 +257,53 @@ namespace osu.Game.Overlays.BeatmapListing
 
             base.Dispose(isDisposing);
         }
+
+        /// <summary>
+        /// Indicates the type of result of a user-requested beatmap search.
+        /// </summary>
+        public enum SearchResultType
+        {
+            /// <summary>
+            /// Actual results have been returned from API.
+            /// </summary>
+            ResultsReturned,
+
+            /// <summary>
+            /// The user is not a supporter, but used supporter-only search filters.
+            /// </summary>
+            SupporterOnlyFilters
+        }
+
+        /// <summary>
+        /// Describes the result of a user-requested beatmap search.
+        /// </summary>
+        public struct SearchResult
+        {
+            public SearchResultType Type { get; private set; }
+
+            /// <summary>
+            /// Contains the beatmap sets returned from API.
+            /// Valid for read if and only if <see cref="Type"/> is <see cref="SearchResultType.ResultsReturned"/>.
+            /// </summary>
+            public List<BeatmapSetInfo> Results { get; private set; }
+
+            /// <summary>
+            /// Contains the names of supporter-only filters requested by the user.
+            /// Valid for read if and only if <see cref="Type"/> is <see cref="SearchResultType.SupporterOnlyFilters"/>.
+            /// </summary>
+            public List<LocalisableString> SupporterOnlyFiltersUsed { get; private set; }
+
+            public static SearchResult ResultsReturned(List<BeatmapSetInfo> results) => new SearchResult
+            {
+                Type = SearchResultType.ResultsReturned,
+                Results = results
+            };
+
+            public static SearchResult SupporterOnlyFilters(List<LocalisableString> filters) => new SearchResult
+            {
+                Type = SearchResultType.SupporterOnlyFilters,
+                SupporterOnlyFiltersUsed = filters
+            };
+        }
     }
 }

osu.Game/Overlays/BeatmapListing/BeatmapSearchRulesetFilterRow.cs

@@ -3,6 +3,7 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Game.Resources.Localisation.Web;
 using osu.Game.Rulesets;
 
@@ -22,14 +23,21 @@ namespace osu.Game.Overlays.BeatmapListing
             [BackgroundDependencyLoader]
             private void load(RulesetStore rulesets)
             {
-                AddItem(new RulesetInfo
-                {
-                    Name = @"Any"
-                });
+                AddTabItem(new RulesetFilterTabItemAny());
 
                 foreach (var r in rulesets.AvailableRulesets)
                     AddItem(r);
             }
         }
+
+        private class RulesetFilterTabItemAny : FilterTabItem<RulesetInfo>
+        {
+            protected override LocalisableString LabelFor(RulesetInfo info) => BeatmapsStrings.ModeAny;
+
+            public RulesetFilterTabItemAny()
+                : base(new RulesetInfo())
+            {
+            }
+        }
     }
 }

osu.Game/Overlays/BeatmapListingOverlay.cs

@@ -7,6 +7,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions.IEnumerableExtensions;
+using osu.Framework.Localisation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
@@ -15,7 +16,9 @@ using osu.Framework.Graphics.Textures;
 using osu.Framework.Input.Events;
 using osu.Game.Audio;
 using osu.Game.Beatmaps;
+using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
+using osu.Game.Graphics.Containers;
 using osu.Game.Overlays.BeatmapListing;
 using osu.Game.Overlays.BeatmapListing.Panels;
 using osu.Game.Resources.Localisation.Web;
@@ -33,6 +36,7 @@ namespace osu.Game.Overlays
         private Container panelTarget;
         private FillFlowContainer<BeatmapPanel> foundContent;
         private NotFoundDrawable notFoundContent;
+        private SupporterRequiredDrawable supporterRequiredContent;
         private BeatmapListingFilterControl filterControl;
 
         public BeatmapListingOverlay()
@@ -76,6 +80,7 @@ namespace osu.Game.Overlays
                                 {
                                     foundContent = new FillFlowContainer<BeatmapPanel>(),
                                     notFoundContent = new NotFoundDrawable(),
+                                    supporterRequiredContent = new SupporterRequiredDrawable(),
                                 }
                             }
                         },
@@ -115,9 +120,16 @@ namespace osu.Game.Overlays
 
         private Task panelLoadDelegate;
 
-        private void onSearchFinished(List<BeatmapSetInfo> beatmaps)
+        private void onSearchFinished(BeatmapListingFilterControl.SearchResult searchResult)
         {
-            var newPanels = beatmaps.Select<BeatmapSetInfo, BeatmapPanel>(b => new GridBeatmapPanel(b)
+            if (searchResult.Type == BeatmapListingFilterControl.SearchResultType.SupporterOnlyFilters)
+            {
+                supporterRequiredContent.UpdateText(searchResult.SupporterOnlyFiltersUsed);
+                addContentToPlaceholder(supporterRequiredContent);
+                return;
+            }
+
+            var newPanels = searchResult.Results.Select<BeatmapSetInfo, BeatmapPanel>(b => new GridBeatmapPanel(b)
             {
                 Anchor = Anchor.TopCentre,
                 Origin = Anchor.TopCentre,
@@ -128,7 +140,7 @@ namespace osu.Game.Overlays
                 //No matches case
                 if (!newPanels.Any())
                 {
-                    LoadComponentAsync(notFoundContent, addContentToPlaceholder, (cancellationToken = new CancellationTokenSource()).Token);
+                    addContentToPlaceholder(notFoundContent);
                     return;
                 }
 
@@ -170,9 +182,9 @@ namespace osu.Game.Overlays
             {
                 var transform = lastContent.FadeOut(100, Easing.OutQuint);
 
-                if (lastContent == notFoundContent)
+                if (lastContent == notFoundContent || lastContent == supporterRequiredContent)
                 {
-                    // not found display may be used multiple times, so don't expire/dispose it.
+                    // the placeholders may be used multiple times, so don't expire/dispose them.
                     transform.Schedule(() => panelTarget.Remove(lastContent));
                 }
                 else
@@ -240,6 +252,67 @@ namespace osu.Game.Overlays
             }
         }
 
+        // TODO: localisation requires Text/LinkFlowContainer support for localising strings with links inside
+        // (https://github.com/ppy/osu-framework/issues/4530)
+        public class SupporterRequiredDrawable : CompositeDrawable
+        {
+            private LinkFlowContainer supporterRequiredText;
+
+            public SupporterRequiredDrawable()
+            {
+                RelativeSizeAxes = Axes.X;
+                Height = 225;
+                Alpha = 0;
+            }
+
+            [BackgroundDependencyLoader]
+            private void load(TextureStore textures)
+            {
+                AddInternal(new FillFlowContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Y,
+                    AutoSizeAxes = Axes.X,
+                    Direction = FillDirection.Horizontal,
+                    Children = new Drawable[]
+                    {
+                        new Sprite
+                        {
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            RelativeSizeAxes = Axes.Both,
+                            FillMode = FillMode.Fit,
+                            Texture = textures.Get(@"Online/supporter-required"),
+                        },
+                        supporterRequiredText = new LinkFlowContainer
+                        {
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            AutoSizeAxes = Axes.Both,
+                            Margin = new MarginPadding { Bottom = 10 },
+                        },
+                    }
+                });
+            }
+
+            public void UpdateText(List<LocalisableString> filters)
+            {
+                supporterRequiredText.Clear();
+
+                supporterRequiredText.AddText(
+                    BeatmapsStrings.ListingSearchSupporterFilterQuoteDefault(string.Join(" and ", filters), "").ToString(),
+                    t =>
+                    {
+                        t.Font = OsuFont.GetFont(size: 16);
+                        t.Colour = Colour4.White;
+                    }
+                );
+
+                supporterRequiredText.AddLink(BeatmapsStrings.ListingSearchSupporterFilterQuoteLinkText.ToString(), @"/store/products/supporter-tag");
+            }
+        }
+
         private const double time_between_fetches = 500;
 
         private double lastFetchDisplayedTime;

osu.Game/Overlays/BeatmapSet/BasicStats.cs

@@ -95,7 +95,7 @@ namespace osu.Game.Overlays.BeatmapSet
         {
             private readonly OsuSpriteText value;
 
-            public string TooltipText { get; }
+            public LocalisableString TooltipText { get; }
 
             public LocalisableString Value
             {

osu.Game/Overlays/BeatmapSet/Buttons/FavouriteButton.cs

@@ -7,6 +7,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Beatmaps;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.API;
@@ -28,7 +29,7 @@ namespace osu.Game.Overlays.BeatmapSet.Buttons
 
         private readonly IBindable<User> localUser = new Bindable<User>();
 
-        public string TooltipText
+        public LocalisableString TooltipText
         {
             get
             {

osu.Game/Overlays/BeatmapSet/Buttons/HeaderDownloadButton.cs

@@ -7,6 +7,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
@@ -26,7 +27,7 @@ namespace osu.Game.Overlays.BeatmapSet.Buttons
 
         private readonly bool noVideo;
 
-        public string TooltipText => button.Enabled.Value ? "download this beatmap" : "login to download";
+        public LocalisableString TooltipText => button.Enabled.Value ? "download this beatmap" : "login to download";
 
         private readonly IBindable<User> localUser = new Bindable<User>();
 

osu.Game/Overlays/Chat/ChatLine.cs

@@ -240,12 +240,15 @@ namespace osu.Game.Overlays.Chat
             {
                 get
                 {
+                    if (sender.Equals(User.SYSTEM_USER))
+                        return Array.Empty<MenuItem>();
+
                     List<MenuItem> items = new List<MenuItem>
                     {
                         new OsuMenuItem("View Profile", MenuItemType.Highlighted, Action)
                     };
 
-                    if (sender.Id != api.LocalUser.Value.Id)
+                    if (!sender.Equals(api.LocalUser.Value))
                         items.Add(new OsuMenuItem("Start Chat", MenuItemType.Standard, startChatAction));
 
                     return items.ToArray();

osu.Game/Overlays/Comments/DrawableComment.cs

@@ -20,6 +20,7 @@ using System;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Extensions.IEnumerableExtensions;
 using System.Collections.Specialized;
+using osu.Framework.Localisation;
 using osu.Game.Overlays.Comments.Buttons;
 
 namespace osu.Game.Overlays.Comments
@@ -395,7 +396,7 @@ namespace osu.Game.Overlays.Comments
 
         private class ParentUsername : FillFlowContainer, IHasTooltip
         {
-            public string TooltipText => getParentMessage();
+            public LocalisableString TooltipText => getParentMessage();
 
             private readonly Comment parentComment;
 
@@ -427,7 +428,7 @@ namespace osu.Game.Overlays.Comments
                 if (parentComment == null)
                     return string.Empty;
 
-                return parentComment.HasMessage ? parentComment.Message : parentComment.IsDeleted ? @"deleted" : string.Empty;
+                return parentComment.HasMessage ? parentComment.Message : parentComment.IsDeleted ? "deleted" : string.Empty;
             }
         }
     }

osu.Game/Overlays/Mods/ModButton.cs

@@ -14,6 +14,7 @@ using System;
 using System.Linq;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.UserInterface;
 
@@ -34,7 +35,7 @@ namespace osu.Game.Overlays.Mods
         /// </summary>
         public Action<Mod> SelectionChanged;
 
-        public string TooltipText => (SelectedMod?.Description ?? Mods.FirstOrDefault()?.Description) ?? string.Empty;
+        public LocalisableString TooltipText => (SelectedMod?.Description ?? Mods.FirstOrDefault()?.Description) ?? string.Empty;
 
         private const Easing mod_switch_easing = Easing.InOutSine;
         private const double mod_switch_duration = 120;

osu.Game/Overlays/Mods/ModSelectOverlay.cs

@@ -37,9 +37,6 @@ namespace osu.Game.Overlays.Mods
         protected readonly TriangleButton CustomiseButton;
         protected readonly TriangleButton CloseButton;
 
-        protected readonly Drawable MultiplierSection;
-        protected readonly OsuSpriteText MultiplierLabel;
-
         protected readonly FillFlowContainer FooterContainer;
 
         protected override bool BlockNonPositionalInput => false;
@@ -324,30 +321,6 @@ namespace osu.Game.Overlays.Mods
                                                 Origin = Anchor.CentreLeft,
                                                 Anchor = Anchor.CentreLeft,
                                             },
-                                            MultiplierSection = new FillFlowContainer
-                                            {
-                                                AutoSizeAxes = Axes.Both,
-                                                Spacing = new Vector2(footer_button_spacing / 2, 0),
-                                                Origin = Anchor.CentreLeft,
-                                                Anchor = Anchor.CentreLeft,
-                                                Children = new Drawable[]
-                                                {
-                                                    new OsuSpriteText
-                                                    {
-                                                        Text = @"Score Multiplier:",
-                                                        Font = OsuFont.GetFont(size: 30),
-                                                        Origin = Anchor.CentreLeft,
-                                                        Anchor = Anchor.CentreLeft,
-                                                    },
-                                                    MultiplierLabel = new OsuSpriteText
-                                                    {
-                                                        Font = OsuFont.GetFont(size: 30, weight: FontWeight.Bold),
-                                                        Origin = Anchor.CentreLeft,
-                                                        Anchor = Anchor.CentreLeft,
-                                                        Width = 70, // make width fixed so reflow doesn't occur when multiplier number changes.
-                                                    },
-                                                },
-                                            },
                                         }
                                     }
                                 },
@@ -361,11 +334,8 @@ namespace osu.Game.Overlays.Mods
         }
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuColour colours, AudioManager audio, OsuGameBase osu)
+        private void load(AudioManager audio, OsuGameBase osu)
         {
-            LowMultiplierColour = colours.Red;
-            HighMultiplierColour = colours.Green;
-
             availableMods = osu.AvailableMods.GetBoundCopy();
 
             sampleOn = audio.Samples.Get(@"UI/check-on");
@@ -495,26 +465,6 @@ namespace osu.Game.Overlays.Mods
 
             foreach (var section in ModSectionsContainer.Children)
                 section.UpdateSelectedButtons(selectedMods);
-
-            updateMultiplier();
-        }
-
-        private void updateMultiplier()
-        {
-            var multiplier = 1.0;
-
-            foreach (var mod in SelectedMods.Value)
-            {
-                multiplier *= mod.ScoreMultiplier;
-            }
-
-            MultiplierLabel.Text = $"{multiplier:N2}x";
-            if (multiplier > 1.0)
-                MultiplierLabel.FadeColour(HighMultiplierColour, 200);
-            else if (multiplier < 1.0)
-                MultiplierLabel.FadeColour(LowMultiplierColour, 200);
-            else
-                MultiplierLabel.FadeColour(Color4.White, 200);
         }
 
         private void modButtonPressed(Mod selectedMod)

osu.Game/Overlays/OverlayPanelDisplayStyleControl.cs

@@ -11,6 +11,7 @@ using osu.Game.Graphics.UserInterface;
 using osu.Framework.Allocation;
 using osuTK.Graphics;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 
 namespace osu.Game.Overlays
 {
@@ -56,7 +57,7 @@ namespace osu.Game.Overlays
             [Resolved]
             private OverlayColourProvider colourProvider { get; set; }
 
-            public string TooltipText => $@"{Value} view";
+            public LocalisableString TooltipText => $@"{Value} view";
 
             private readonly SpriteIcon icon;
 

osu.Game/Overlays/Profile/Header/Components/DrawableBadge.cs

@@ -7,6 +7,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
+using osu.Framework.Localisation;
 using osu.Game.Users;
 using osuTK;
 
@@ -42,6 +43,6 @@ namespace osu.Game.Overlays.Profile.Header.Components
             InternalChild.FadeInFromZero(200);
         }
 
-        public string TooltipText => badge.Description;
+        public LocalisableString TooltipText => badge.Description;
     }
 }

osu.Game/Overlays/Profile/Header/Components/ExpandDetailsButton.cs

@@ -6,6 +6,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osuTK;
 
 namespace osu.Game.Overlays.Profile.Header.Components
@@ -14,7 +15,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly BindableBool DetailsVisible = new BindableBool();
 
-        public override string TooltipText => DetailsVisible.Value ? "collapse" : "expand";
+        public override LocalisableString TooltipText => DetailsVisible.Value ? "collapse" : "expand";
 
         private SpriteIcon icon;
 

osu.Game/Overlays/Profile/Header/Components/FollowersButton.cs

@@ -4,6 +4,7 @@
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Users;
 
 namespace osu.Game.Overlays.Profile.Header.Components
@@ -12,7 +13,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public override string TooltipText => "followers";
+        public override LocalisableString TooltipText => "followers";
 
         protected override IconUsage Icon => FontAwesome.Solid.User;
 

osu.Game/Overlays/Profile/Header/Components/LevelBadge.cs

@@ -8,6 +8,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Users;
@@ -18,7 +19,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public string TooltipText { get; }
+        public LocalisableString TooltipText { get; }
 
         private OsuSpriteText levelText;
 

osu.Game/Overlays/Profile/Header/Components/LevelProgressBar.cs

@@ -6,6 +6,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Graphics.UserInterface;
@@ -18,7 +19,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public string TooltipText { get; }
+        public LocalisableString TooltipText { get; }
 
         private Bar levelProgressBar;
         private OsuSpriteText levelProgressText;

osu.Game/Overlays/Profile/Header/Components/MappingSubscribersButton.cs

@@ -4,6 +4,7 @@
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Users;
 
 namespace osu.Game.Overlays.Profile.Header.Components
@@ -12,7 +13,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public override string TooltipText => "mapping subscribers";
+        public override LocalisableString TooltipText => "mapping subscribers";
 
         protected override IconUsage Icon => FontAwesome.Solid.Bell;
 

osu.Game/Overlays/Profile/Header/Components/MessageUserButton.cs

@@ -5,6 +5,7 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Online.API;
 using osu.Game.Online.Chat;
 using osu.Game.Users;
@@ -16,7 +17,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public override string TooltipText => "send message";
+        public override LocalisableString TooltipText => "send message";
 
         [Resolved(CanBeNull = true)]
         private ChannelManager channelManager { get; set; }

osu.Game/Overlays/Profile/Header/Components/OverlinedTotalPlayTime.cs

@@ -6,6 +6,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 using osu.Game.Users;
 
 namespace osu.Game.Overlays.Profile.Header.Components
@@ -14,7 +15,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
     {
         public readonly Bindable<User> User = new Bindable<User>();
 
-        public string TooltipText { get; set; }
+        public LocalisableString TooltipText { get; set; }
 
         private OverlinedInfoContainer info;
 

osu.Game/Overlays/Profile/Header/Components/SupporterIcon.cs

@@ -8,6 +8,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 
 namespace osu.Game.Overlays.Profile.Header.Components
@@ -18,7 +19,7 @@ namespace osu.Game.Overlays.Profile.Header.Components
         private readonly FillFlowContainer iconContainer;
         private readonly CircularContainer content;
 
-        public string TooltipText => "osu!supporter";
+        public LocalisableString TooltipText => "osu!supporter";
 
         public int SupportLevel
         {

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

@@ -143,7 +143,7 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 
         private class PlayCountText : CompositeDrawable, IHasTooltip
         {
-            public string TooltipText => "times played";
+            public LocalisableString TooltipText => "times played";
 
             public PlayCountText(int playCount)
             {

osu.Game/Overlays/RestoreDefaultValueButton.cs

@@ -10,6 +10,7 @@ using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Effects;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Graphics.UserInterface;
 
@@ -76,7 +77,7 @@ namespace osu.Game.Overlays
             UpdateState();
         }
 
-        public string TooltipText => "revert to default";
+        public LocalisableString TooltipText => "revert to default";
 
         protected override bool OnHover(HoverEvent e)
         {

osu.Game/Overlays/Settings/OutlinedTextBox.cs

@@ -0,0 +1,49 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics;
+using osu.Game.Graphics.UserInterface;
+using osuTK.Graphics;
+
+namespace osu.Game.Overlays.Settings
+{
+    public class OutlinedTextBox : OsuTextBox
+    {
+        private const float border_thickness = 3;
+
+        private Color4 borderColourFocused;
+        private Color4 borderColourUnfocused;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colour)
+        {
+            borderColourUnfocused = colour.Gray4.Opacity(0.5f);
+            borderColourFocused = BorderColour;
+
+            updateBorder();
+        }
+
+        protected override void OnFocus(FocusEvent e)
+        {
+            base.OnFocus(e);
+
+            updateBorder();
+        }
+
+        protected override void OnFocusLost(FocusLostEvent e)
+        {
+            base.OnFocusLost(e);
+
+            updateBorder();
+        }
+
+        private void updateBorder()
+        {
+            BorderThickness = border_thickness;
+            BorderColour = HasFocus ? borderColourFocused : borderColourUnfocused;
+        }
+    }
+}

osu.Game/Overlays/Settings/Sections/Audio/OffsetSettings.cs

@@ -3,6 +3,7 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Game.Configuration;
 using osu.Game.Graphics.UserInterface;
 
@@ -32,7 +33,7 @@ namespace osu.Game.Overlays.Settings.Sections.Audio
 
         private class OffsetSlider : OsuSliderBar<double>
         {
-            public override string TooltipText => Current.Value.ToString(@"0ms");
+            public override LocalisableString TooltipText => Current.Value.ToString(@"0ms");
         }
     }
 }

osu.Game/Overlays/Settings/Sections/Graphics/LayoutSettings.cs

@@ -233,7 +233,7 @@ namespace osu.Game.Overlays.Settings.Sections.Graphics
 
         private class UIScaleSlider : OsuSliderBar<float>
         {
-            public override string TooltipText => base.TooltipText + "x";
+            public override LocalisableString TooltipText => base.TooltipText + "x";
         }
 
         private class ResolutionSettingsDropdown : SettingsDropdown<Size>

osu.Game/Overlays/Settings/Sections/Input/MouseSettings.cs

@@ -6,6 +6,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Configuration;
 using osu.Framework.Graphics;
 using osu.Framework.Input.Handlers.Mouse;
+using osu.Framework.Localisation;
 using osu.Game.Configuration;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Input;
@@ -116,7 +117,7 @@ namespace osu.Game.Overlays.Settings.Sections.Input
 
         private class SensitivitySlider : OsuSliderBar<double>
         {
-            public override string TooltipText => Current.Disabled ? "enable high precision mouse to adjust sensitivity" : $"{base.TooltipText}x";
+            public override LocalisableString TooltipText => Current.Disabled ? "enable high precision mouse to adjust sensitivity" : $"{base.TooltipText}x";
         }
     }
 }

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

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Localisation;
 using osu.Game.Graphics.UserInterface;
 
 namespace osu.Game.Overlays.Settings.Sections
@@ -10,6 +11,6 @@ namespace osu.Game.Overlays.Settings.Sections
     /// </summary>
     internal class SizeSlider : OsuSliderBar<float>
     {
-        public override string TooltipText => Current.Value.ToString(@"0.##x");
+        public override LocalisableString TooltipText => Current.Value.ToString(@"0.##x");
     }
 }

osu.Game/Overlays/Settings/Sections/UserInterface/GeneralSettings.cs

@@ -3,6 +3,7 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Game.Configuration;
 using osu.Game.Graphics.UserInterface;
 
@@ -44,7 +45,7 @@ namespace osu.Game.Overlays.Settings.Sections.UserInterface
 
         private class TimeSlider : OsuSliderBar<float>
         {
-            public override string TooltipText => Current.Value.ToString("N0") + "ms";
+            public override LocalisableString TooltipText => Current.Value.ToString(@"N0") + "ms";
         }
     }
 }

osu.Game/Overlays/Settings/Sections/UserInterface/SongSelectSettings.cs

@@ -5,6 +5,7 @@ using System;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
+using osu.Framework.Localisation;
 using osu.Game.Configuration;
 using osu.Game.Graphics.UserInterface;
 
@@ -62,12 +63,12 @@ namespace osu.Game.Overlays.Settings.Sections.UserInterface
 
         private class MaximumStarsSlider : StarsSlider
         {
-            public override string TooltipText => Current.IsDefault ? "no limit" : base.TooltipText;
+            public override LocalisableString TooltipText => Current.IsDefault ? "no limit" : base.TooltipText;
         }
 
         private class StarsSlider : OsuSliderBar<double>
         {
-            public override string TooltipText => Current.Value.ToString(@"0.## stars");
+            public override LocalisableString TooltipText => Current.Value.ToString(@"0.## stars");
         }
     }
 }

osu.Game/Overlays/Settings/SettingsButton.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Localisation;
 using osu.Game.Graphics.UserInterface;
 
 namespace osu.Game.Overlays.Settings
@@ -17,14 +18,15 @@ namespace osu.Game.Overlays.Settings
             Padding = new MarginPadding { Left = SettingsPanel.CONTENT_MARGINS, Right = SettingsPanel.CONTENT_MARGINS };
         }
 
-        public string TooltipText { get; set; }
+        public LocalisableString TooltipText { get; set; }
 
         public override IEnumerable<string> FilterTerms
         {
             get
             {
-                if (TooltipText != null)
-                    return base.FilterTerms.Append(TooltipText);
+                if (TooltipText != default)
+                    // TODO: this won't work as intended once the tooltip text is translated.
+                    return base.FilterTerms.Append(TooltipText.ToString());
 
                 return base.FilterTerms;
             }

osu.Game/Overlays/Settings/SettingsItem.cs

@@ -35,7 +35,7 @@ namespace osu.Game.Overlays.Settings
 
         public bool ShowsDefaultIndicator = true;
 
-        public string TooltipText { get; set; }
+        public LocalisableString TooltipText { get; set; }
 
         [Resolved]
         private OsuColour colours { get; set; }
@@ -142,4 +142,4 @@ namespace osu.Game.Overlays.Settings
                 labelText.Alpha = controlWithCurrent.Current.Disabled ? 0.3f : 1;
         }
     }
-}
+}

osu.Game/Overlays/Settings/SettingsNumberBox.cs

@@ -1,19 +1,65 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.UserInterface;
 
 namespace osu.Game.Overlays.Settings
 {
-    public class SettingsNumberBox : SettingsItem<string>
+    public class SettingsNumberBox : SettingsItem<int?>
     {
-        protected override Drawable CreateControl() => new NumberBox
+        protected override Drawable CreateControl() => new NumberControl
         {
-            Margin = new MarginPadding { Top = 5 },
             RelativeSizeAxes = Axes.X,
+            Margin = new MarginPadding { Top = 5 }
         };
 
-        public class NumberBox : SettingsTextBox.TextBox
+        private sealed class NumberControl : CompositeDrawable, IHasCurrentValue<int?>
+        {
+            private readonly BindableWithCurrent<int?> current = new BindableWithCurrent<int?>();
+
+            public Bindable<int?> Current
+            {
+                get => current.Current;
+                set => current.Current = value;
+            }
+
+            public NumberControl()
+            {
+                AutoSizeAxes = Axes.Y;
+
+                OutlinedNumberBox numberBox;
+
+                InternalChildren = new[]
+                {
+                    numberBox = new OutlinedNumberBox
+                    {
+                        Margin = new MarginPadding { Top = 5 },
+                        RelativeSizeAxes = Axes.X,
+                        CommitOnFocusLost = true
+                    }
+                };
+
+                numberBox.Current.BindValueChanged(e =>
+                {
+                    int? value = null;
+
+                    if (int.TryParse(e.NewValue, out var intVal))
+                        value = intVal;
+
+                    current.Value = value;
+                });
+
+                Current.BindValueChanged(e =>
+                {
+                    numberBox.Current.Value = e.NewValue?.ToString();
+                });
+            }
+        }
+
+        private class OutlinedNumberBox : OutlinedTextBox
         {
             protected override bool CanAddCharacter(char character) => char.IsNumber(character);
         }

osu.Game/Overlays/Settings/SettingsTextBox.cs

@@ -1,60 +1,17 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using osu.Framework.Allocation;
-using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
-using osu.Framework.Input.Events;
-using osu.Game.Graphics;
-using osu.Game.Graphics.UserInterface;
-using osuTK.Graphics;
 
 namespace osu.Game.Overlays.Settings
 {
     public class SettingsTextBox : SettingsItem<string>
     {
-        protected override Drawable CreateControl() => new TextBox
+        protected override Drawable CreateControl() => new OutlinedTextBox
         {
             Margin = new MarginPadding { Top = 5 },
             RelativeSizeAxes = Axes.X,
-            CommitOnFocusLost = true,
+            CommitOnFocusLost = true
         };
-
-        public class TextBox : OsuTextBox
-        {
-            private const float border_thickness = 3;
-
-            private Color4 borderColourFocused;
-            private Color4 borderColourUnfocused;
-
-            [BackgroundDependencyLoader]
-            private void load(OsuColour colour)
-            {
-                borderColourUnfocused = colour.Gray4.Opacity(0.5f);
-                borderColourFocused = BorderColour;
-
-                updateBorder();
-            }
-
-            protected override void OnFocus(FocusEvent e)
-            {
-                base.OnFocus(e);
-
-                updateBorder();
-            }
-
-            protected override void OnFocusLost(FocusLostEvent e)
-            {
-                base.OnFocusLost(e);
-
-                updateBorder();
-            }
-
-            private void updateBorder()
-            {
-                BorderThickness = border_thickness;
-                BorderColour = HasFocus ? borderColourFocused : borderColourUnfocused;
-            }
-        }
     }
 }

osu.Game/Overlays/Toolbar/ToolbarButton.cs

@@ -159,28 +159,6 @@ namespace osu.Game.Overlays.Toolbar
             };
         }
 
-        private RealmKeyBinding realmKeyBinding;
-
-        protected override void LoadComplete()
-        {
-            base.LoadComplete();
-
-            if (Hotkey == null) return;
-
-            realmKeyBinding = realmFactory.Context.All<RealmKeyBinding>().FirstOrDefault(rkb => rkb.RulesetID == null && rkb.ActionInt == (int)Hotkey.Value);
-
-            if (realmKeyBinding != null)
-            {
-                realmKeyBinding.PropertyChanged += (sender, args) =>
-                {
-                    if (args.PropertyName == nameof(realmKeyBinding.KeyCombinationString))
-                        updateKeyBindingTooltip();
-                };
-            }
-
-            updateKeyBindingTooltip();
-        }
-
         protected override bool OnMouseDown(MouseDownEvent e) => true;
 
         protected override bool OnClick(ClickEvent e)
@@ -196,6 +174,7 @@ namespace osu.Game.Overlays.Toolbar
 
             HoverBackground.FadeIn(200);
             tooltipContainer.FadeIn(100);
+
             return base.OnHover(e);
         }
 
@@ -222,6 +201,10 @@ namespace osu.Game.Overlays.Toolbar
 
         private void updateKeyBindingTooltip()
         {
+            if (Hotkey == null) return;
+
+            var realmKeyBinding = realmFactory.Context.All<RealmKeyBinding>().FirstOrDefault(rkb => rkb.RulesetID == null && rkb.ActionInt == (int)Hotkey.Value);
+
             if (realmKeyBinding != null)
             {
                 var keyBindingString = realmKeyBinding.KeyCombination.ReadableString();

osu.Game/Rulesets/Edit/BeatmapVerifier.cs

@@ -22,6 +22,8 @@ namespace osu.Game.Rulesets.Edit
             // Audio
             new CheckAudioPresence(),
             new CheckAudioQuality(),
+            new CheckMutedObjects(),
+            new CheckFewHitsounds(),
 
             // Compose
             new CheckUnsnappedObjects(),

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

@@ -0,0 +1,164 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Audio;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Edit.Checks
+{
+    public class CheckFewHitsounds : ICheck
+    {
+        /// <summary>
+        /// 2 measures (4/4) of 120 BPM, typically makes up a few patterns in the map.
+        /// This is almost always ok, but can still be useful for the mapper to make sure hitsounding coverage is good.
+        /// </summary>
+        private const int negligible_threshold_time = 4000;
+
+        /// <summary>
+        /// 4 measures (4/4) of 120 BPM, typically makes up a large portion of a section in the song.
+        /// This is ok if the section is a quiet intro, for example.
+        /// </summary>
+        private const int warning_threshold_time = 8000;
+
+        /// <summary>
+        /// 12 measures (4/4) of 120 BPM, typically makes up multiple sections in the song.
+        /// </summary>
+        private const int problem_threshold_time = 24000;
+
+        // Should pass at least this many objects without hitsounds to be considered an issue (should work for Easy diffs too).
+        private const int warning_threshold_objects = 4;
+        private const int problem_threshold_objects = 16;
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Audio, "Few or no hitsounds");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateLongPeriodProblem(this),
+            new IssueTemplateLongPeriodWarning(this),
+            new IssueTemplateLongPeriodNegligible(this),
+            new IssueTemplateNoHitsounds(this)
+        };
+
+        private bool mapHasHitsounds;
+        private int objectsWithoutHitsounds;
+        private double lastHitsoundTime;
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            if (!context.Beatmap.HitObjects.Any())
+                yield break;
+
+            mapHasHitsounds = false;
+            objectsWithoutHitsounds = 0;
+            lastHitsoundTime = context.Beatmap.HitObjects.First().StartTime;
+
+            var hitObjectsIncludingNested = new List<HitObject>();
+
+            foreach (var hitObject in context.Beatmap.HitObjects)
+            {
+                // Samples play on the end of objects. Some objects have nested objects to accomplish playing them elsewhere (e.g. slider head/repeat).
+                foreach (var nestedHitObject in hitObject.NestedHitObjects)
+                    hitObjectsIncludingNested.Add(nestedHitObject);
+
+                hitObjectsIncludingNested.Add(hitObject);
+            }
+
+            var hitObjectsByEndTime = hitObjectsIncludingNested.OrderBy(o => o.GetEndTime()).ToList();
+            var hitObjectCount = hitObjectsByEndTime.Count;
+
+            for (int i = 0; i < hitObjectCount; ++i)
+            {
+                var hitObject = hitObjectsByEndTime[i];
+
+                // This is used to perform an update at the end so that the period after the last hitsounded object can be an issue.
+                bool isLastObject = i == hitObjectCount - 1;
+
+                foreach (var issue in applyHitsoundUpdate(hitObject, isLastObject))
+                    yield return issue;
+            }
+
+            if (!mapHasHitsounds)
+                yield return new IssueTemplateNoHitsounds(this).Create();
+        }
+
+        private IEnumerable<Issue> applyHitsoundUpdate(HitObject hitObject, bool isLastObject = false)
+        {
+            var time = hitObject.GetEndTime();
+            bool hasHitsound = hitObject.Samples.Any(isHitsound);
+            bool couldHaveHitsound = hitObject.Samples.Any(isHitnormal);
+
+            // Only generating issues on hitsounded or last objects ensures we get one issue per long period.
+            // If there are no hitsounds we let the "No hitsounds" template take precedence.
+            if (hasHitsound || (isLastObject && mapHasHitsounds))
+            {
+                var timeWithoutHitsounds = time - lastHitsoundTime;
+
+                if (timeWithoutHitsounds > problem_threshold_time && objectsWithoutHitsounds > problem_threshold_objects)
+                    yield return new IssueTemplateLongPeriodProblem(this).Create(lastHitsoundTime, timeWithoutHitsounds);
+                else if (timeWithoutHitsounds > warning_threshold_time && objectsWithoutHitsounds > warning_threshold_objects)
+                    yield return new IssueTemplateLongPeriodWarning(this).Create(lastHitsoundTime, timeWithoutHitsounds);
+                else if (timeWithoutHitsounds > negligible_threshold_time && objectsWithoutHitsounds > warning_threshold_objects)
+                    yield return new IssueTemplateLongPeriodNegligible(this).Create(lastHitsoundTime, timeWithoutHitsounds);
+            }
+
+            if (hasHitsound)
+            {
+                mapHasHitsounds = true;
+                objectsWithoutHitsounds = 0;
+                lastHitsoundTime = time;
+            }
+            else if (couldHaveHitsound)
+                ++objectsWithoutHitsounds;
+        }
+
+        private bool isHitsound(HitSampleInfo sample) => HitSampleInfo.AllAdditions.Any(sample.Name.Contains);
+        private bool isHitnormal(HitSampleInfo sample) => sample.Name.Contains(HitSampleInfo.HIT_NORMAL);
+
+        public abstract class IssueTemplateLongPeriod : IssueTemplate
+        {
+            protected IssueTemplateLongPeriod(ICheck check, IssueType type)
+                : base(check, type, "Long period without hitsounds ({0:F1} seconds).")
+            {
+            }
+
+            public Issue Create(double time, double duration) => new Issue(this, duration / 1000f) { Time = time };
+        }
+
+        public class IssueTemplateLongPeriodProblem : IssueTemplateLongPeriod
+        {
+            public IssueTemplateLongPeriodProblem(ICheck check)
+                : base(check, IssueType.Problem)
+            {
+            }
+        }
+
+        public class IssueTemplateLongPeriodWarning : IssueTemplateLongPeriod
+        {
+            public IssueTemplateLongPeriodWarning(ICheck check)
+                : base(check, IssueType.Warning)
+            {
+            }
+        }
+
+        public class IssueTemplateLongPeriodNegligible : IssueTemplateLongPeriod
+        {
+            public IssueTemplateLongPeriodNegligible(ICheck check)
+                : base(check, IssueType.Negligible)
+            {
+            }
+        }
+
+        public class IssueTemplateNoHitsounds : IssueTemplate
+        {
+            public IssueTemplateNoHitsounds(ICheck check)
+                : base(check, IssueType.Problem, "There are no hitsounds.")
+            {
+            }
+
+            public Issue Create() => new Issue(this);
+        }
+    }
+}

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

@@ -0,0 +1,158 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+
+namespace osu.Game.Rulesets.Edit.Checks
+{
+    public class CheckMutedObjects : ICheck
+    {
+        /// <summary>
+        /// Volume percentages lower than or equal to this are typically inaudible.
+        /// </summary>
+        private const int muted_threshold = 5;
+
+        /// <summary>
+        /// Volume percentages lower than or equal to this can sometimes be inaudible depending on sample used and music volume.
+        /// </summary>
+        private const int low_volume_threshold = 20;
+
+        private enum EdgeType
+        {
+            Head,
+            Repeat,
+            Tail,
+            None
+        }
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Audio, "Low volume hitobjects");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateMutedActive(this),
+            new IssueTemplateLowVolumeActive(this),
+            new IssueTemplateMutedPassive(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            foreach (var hitObject in context.Beatmap.HitObjects)
+            {
+                // Worth keeping in mind: The samples of an object always play at its end time.
+                // Objects like spinners have no sound at its start because of this, while hold notes have nested objects to accomplish this.
+                foreach (var nestedHitObject in hitObject.NestedHitObjects)
+                {
+                    foreach (var issue in getVolumeIssues(hitObject, nestedHitObject))
+                        yield return issue;
+                }
+
+                foreach (var issue in getVolumeIssues(hitObject))
+                    yield return issue;
+            }
+        }
+
+        private IEnumerable<Issue> getVolumeIssues(HitObject hitObject, HitObject sampledHitObject = null)
+        {
+            sampledHitObject ??= hitObject;
+            if (!sampledHitObject.Samples.Any())
+                yield break;
+
+            // Samples that allow themselves to be overridden by control points have a volume of 0.
+            int maxVolume = sampledHitObject.Samples.Max(sample => sample.Volume > 0 ? sample.Volume : sampledHitObject.SampleControlPoint.SampleVolume);
+            double samplePlayTime = sampledHitObject.GetEndTime();
+
+            EdgeType edgeType = getEdgeAtTime(hitObject, samplePlayTime);
+            // We only care about samples played on the edges of objects, not ones like spinnerspin or slidertick.
+            if (edgeType == EdgeType.None)
+                yield break;
+
+            string postfix = hitObject is IHasDuration ? edgeType.ToString().ToLower() : null;
+
+            if (maxVolume <= muted_threshold)
+            {
+                if (edgeType == EdgeType.Head)
+                    yield return new IssueTemplateMutedActive(this).Create(hitObject, maxVolume / 100f, sampledHitObject.GetEndTime(), postfix);
+                else
+                    yield return new IssueTemplateMutedPassive(this).Create(hitObject, maxVolume / 100f, sampledHitObject.GetEndTime(), postfix);
+            }
+            else if (maxVolume <= low_volume_threshold && edgeType == EdgeType.Head)
+            {
+                yield return new IssueTemplateLowVolumeActive(this).Create(hitObject, maxVolume / 100f, sampledHitObject.GetEndTime(), postfix);
+            }
+        }
+
+        private EdgeType getEdgeAtTime(HitObject hitObject, double time)
+        {
+            if (Precision.AlmostEquals(time, hitObject.StartTime, 1f))
+                return EdgeType.Head;
+            if (Precision.AlmostEquals(time, hitObject.GetEndTime(), 1f))
+                return EdgeType.Tail;
+
+            if (hitObject is IHasRepeats hasRepeats)
+            {
+                double spanDuration = hasRepeats.Duration / hasRepeats.SpanCount();
+                if (spanDuration <= 0)
+                    // Prevents undefined behaviour in cases like where zero/negative-length sliders/hold notes exist.
+                    return EdgeType.None;
+
+                double spans = (time - hitObject.StartTime) / spanDuration;
+                double acceptableDifference = 1 / spanDuration; // 1 ms of acceptable difference, as with head/tail above.
+
+                if (Precision.AlmostEquals(spans, Math.Ceiling(spans), acceptableDifference) ||
+                    Precision.AlmostEquals(spans, Math.Floor(spans), acceptableDifference))
+                {
+                    return EdgeType.Repeat;
+                }
+            }
+
+            return EdgeType.None;
+        }
+
+        public abstract class IssueTemplateMuted : IssueTemplate
+        {
+            protected IssueTemplateMuted(ICheck check, IssueType type, string unformattedMessage)
+                : base(check, type, unformattedMessage)
+            {
+            }
+
+            public Issue Create(HitObject hitobject, double volume, double time, string postfix = "")
+            {
+                string objectName = hitobject.GetType().Name;
+                if (!string.IsNullOrEmpty(postfix))
+                    objectName += " " + postfix;
+
+                return new Issue(hitobject, this, objectName, volume) { Time = time };
+            }
+        }
+
+        public class IssueTemplateMutedActive : IssueTemplateMuted
+        {
+            public IssueTemplateMutedActive(ICheck check)
+                : base(check, IssueType.Problem, "{0} has a volume of {1:0%}. Clickable objects must have clearly audible feedback.")
+            {
+            }
+        }
+
+        public class IssueTemplateLowVolumeActive : IssueTemplateMuted
+        {
+            public IssueTemplateLowVolumeActive(ICheck check)
+                : base(check, IssueType.Warning, "{0} has a volume of {1:0%}, ensure this is audible.")
+            {
+            }
+        }
+
+        public class IssueTemplateMutedPassive : IssueTemplateMuted
+        {
+            public IssueTemplateMutedPassive(ICheck check)
+                : base(check, IssueType.Negligible, "{0} has a volume of {1:0%}, ensure there is no distinct sound here in the song if inaudible.")
+            {
+            }
+        }
+    }
+}

osu.Game/Rulesets/Mods/IApplicableToBeatmapProcessor.cs

@@ -0,0 +1,18 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Mods
+{
+    /// <summary>
+    /// Interface for a <see cref="Mod"/> that applies changes to a <see cref="BeatmapProcessor"/>.
+    /// </summary>
+    public interface IApplicableToBeatmapProcessor : IApplicableMod
+    {
+        /// <summary>
+        /// Applies this <see cref="Mod"/> to a <see cref="BeatmapProcessor"/>.
+        /// </summary>
+        void ApplyToBeatmapProcessor(IBeatmapProcessor beatmapProcessor);
+    }
+}

osu.Game/Rulesets/Mods/ModRandom.cs

@@ -5,6 +5,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Configuration;
 using osu.Game.Graphics;
+using osu.Game.Overlays.Settings;
 
 namespace osu.Game.Rulesets.Mods
 {
@@ -16,7 +17,7 @@ namespace osu.Game.Rulesets.Mods
         public override IconUsage? Icon => OsuIcon.Dice;
         public override double ScoreMultiplier => 1;
 
-        [SettingSource("Seed", "Use a custom seed instead of a random one", SettingControlType = typeof(SeedSettingsControl))]
+        [SettingSource("Seed", "Use a custom seed instead of a random one", SettingControlType = typeof(SettingsNumberBox))]
         public Bindable<int?> Seed { get; } = new Bindable<int?>
         {
             Default = null,

osu.Game/Rulesets/Mods/SeedSettingsControl.cs

@@ -1,92 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using osu.Framework.Bindables;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.UserInterface;
-using osu.Game.Graphics.UserInterface;
-using osu.Game.Overlays.Settings;
-
-namespace osu.Game.Rulesets.Mods
-{
-    /// <summary>
-    /// A settings control for use by <see cref="IHasSeed"/> mods which have a customisable seed value.
-    /// </summary>
-    public class SeedSettingsControl : SettingsItem<int?>
-    {
-        protected override Drawable CreateControl() => new SeedControl
-        {
-            RelativeSizeAxes = Axes.X,
-            Margin = new MarginPadding { Top = 5 }
-        };
-
-        private sealed class SeedControl : CompositeDrawable, IHasCurrentValue<int?>
-        {
-            private readonly BindableWithCurrent<int?> current = new BindableWithCurrent<int?>();
-
-            public Bindable<int?> Current
-            {
-                get => current;
-                set
-                {
-                    current.Current = value;
-                    seedNumberBox.Text = value.Value.ToString();
-                }
-            }
-
-            private readonly OsuNumberBox seedNumberBox;
-
-            public SeedControl()
-            {
-                AutoSizeAxes = Axes.Y;
-
-                InternalChildren = new[]
-                {
-                    new GridContainer
-                    {
-                        RelativeSizeAxes = Axes.X,
-                        AutoSizeAxes = Axes.Y,
-                        ColumnDimensions = new[]
-                        {
-                            new Dimension(),
-                            new Dimension(GridSizeMode.Absolute, 2),
-                            new Dimension(GridSizeMode.Relative, 0.25f)
-                        },
-                        RowDimensions = new[]
-                        {
-                            new Dimension(GridSizeMode.AutoSize)
-                        },
-                        Content = new[]
-                        {
-                            new Drawable[]
-                            {
-                                seedNumberBox = new OsuNumberBox
-                                {
-                                    RelativeSizeAxes = Axes.X,
-                                    CommitOnFocusLost = true
-                                }
-                            }
-                        }
-                    }
-                };
-
-                seedNumberBox.Current.BindValueChanged(e =>
-                {
-                    int? value = null;
-
-                    if (int.TryParse(e.NewValue, out var intVal))
-                        value = intVal;
-
-                    current.Value = value;
-                });
-            }
-
-            protected override void Update()
-            {
-                if (current.Value == null)
-                    seedNumberBox.Text = current.Current.Value.ToString();
-            }
-        }
-    }
-}

osu.Game/Rulesets/UI/ModIcon.cs

@@ -13,6 +13,7 @@ using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets.Mods;
 using osuTK;
 using osu.Framework.Bindables;
+using osu.Framework.Localisation;
 
 namespace osu.Game.Rulesets.UI
 {
@@ -29,7 +30,7 @@ namespace osu.Game.Rulesets.UI
 
         private const float size = 80;
 
-        public virtual string TooltipText => showTooltip ? mod.IconTooltip : null;
+        public virtual LocalisableString TooltipText => showTooltip ? mod.IconTooltip : null;
 
         private Mod mod;
         private readonly bool showTooltip;

osu.Game/Scoring/ScoreInfo.cs

@@ -46,7 +46,7 @@ namespace osu.Game.Scoring
         [JsonIgnore]
         public int Combo { get; set; } // Todo: Shouldn't exist in here
 
-        [JsonIgnore]
+        [JsonProperty("ruleset_id")]
         public int RulesetID { get; set; }
 
         [JsonProperty("passed")]

osu.Game/Scoring/ScoreManager.cs

@@ -7,6 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Threading;
+using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Microsoft.EntityFrameworkCore;
 using osu.Framework.Bindables;
@@ -72,6 +73,9 @@ namespace osu.Game.Scoring
             }
         }
 
+        protected override Task Populate(ScoreInfo model, ArchiveReader archive, CancellationToken cancellationToken = default)
+            => Task.CompletedTask;
+
         protected override void ExportModelTo(ScoreInfo model, Stream outputStream)
         {
             var file = model.Files.SingleOrDefault();

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

@@ -7,6 +7,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Input.Events;
+using osu.Framework.Localisation;
 using osuTK;
 using osuTK.Graphics;
 
@@ -58,6 +59,6 @@ namespace osu.Game.Screens.Edit.Compose.Components
             icon.FadeColour(!IsHeld && IsHovered ? Color4.White : Color4.Black, TRANSFORM_DURATION, Easing.OutQuint);
         }
 
-        public string TooltipText { get; }
+        public LocalisableString TooltipText { get; }
     }
 }

osu.Game/Screens/Menu/ButtonSystem.cs

@@ -261,7 +261,7 @@ namespace osu.Game.Screens.Menu
             switch (state)
             {
                 default:
-                    return true;
+                    return false;
 
                 case ButtonSystemState.Initial:
                     State = ButtonSystemState.TopLevel;

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

@@ -7,6 +7,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Localisation;
 using osu.Game.Graphics;
 using osu.Game.Online.Rooms;
 
@@ -16,7 +17,7 @@ namespace osu.Game.Screens.OnlinePlay.Components
     {
         private readonly GameType type;
 
-        public string TooltipText => type.Name;
+        public LocalisableString TooltipText => type.Name;
 
         public DrawableGameType(GameType type)
         {

osu.Game/Screens/OnlinePlay/FreeModSelectOverlay.cs

@@ -32,7 +32,6 @@ namespace osu.Game.Screens.OnlinePlay
         {
             IsValidMod = m => true;
 
-            MultiplierSection.Alpha = 0;
             DeselectAllButton.Alpha = 0;
 
             Drawable selectAllButton;

osu.Game/Screens/Select/BeatmapInfoWedge.cs

@@ -431,7 +431,7 @@ namespace osu.Game.Screens.Select
 
             public class InfoLabel : Container, IHasTooltip
             {
-                public string TooltipText { get; }
+                public LocalisableString TooltipText { get; }
 
                 public InfoLabel(BeatmapStatistic statistic)
                 {

osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs

@@ -42,6 +42,7 @@ namespace osu.Game.Screens.Select.Carousel
             match &= !criteria.ApproachRate.HasFilter || criteria.ApproachRate.IsInRange(Beatmap.BaseDifficulty.ApproachRate);
             match &= !criteria.DrainRate.HasFilter || criteria.DrainRate.IsInRange(Beatmap.BaseDifficulty.DrainRate);
             match &= !criteria.CircleSize.HasFilter || criteria.CircleSize.IsInRange(Beatmap.BaseDifficulty.CircleSize);
+            match &= !criteria.OverallDifficulty.HasFilter || criteria.OverallDifficulty.IsInRange(Beatmap.BaseDifficulty.OverallDifficulty);
             match &= !criteria.Length.HasFilter || criteria.Length.IsInRange(Beatmap.Length);
             match &= !criteria.BPM.HasFilter || criteria.BPM.IsInRange(Beatmap.BPM);
 

osu.Game/Screens/Select/FilterCriteria.cs

@@ -24,6 +24,7 @@ namespace osu.Game.Screens.Select
         public OptionalRange<float> ApproachRate;
         public OptionalRange<float> DrainRate;
         public OptionalRange<float> CircleSize;
+        public OptionalRange<float> OverallDifficulty;
         public OptionalRange<double> Length;
         public OptionalRange<double> BPM;
         public OptionalRange<int> BeatDivisor;