diff --git a/osu.Game.Rulesets.Catch/CatchRuleset.cs b/osu.Game.Rulesets.Catch/CatchRuleset.cs
index 766b5f6f58..964598dcaf 100644
--- a/osu.Game.Rulesets.Catch/CatchRuleset.cs
+++ b/osu.Game.Rulesets.Catch/CatchRuleset.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Catch.Mods;
@@ -32,7 +30,7 @@ namespace osu.Game.Rulesets.Catch
 {
     public class CatchRuleset : Ruleset, ILegacyRuleset
     {
-        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod> mods = null) => new DrawableCatchRuleset(this, beatmap, mods);
+        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod>? mods = null) => new DrawableCatchRuleset(this, beatmap, mods);
 
         public override ScoreProcessor CreateScoreProcessor() => new CatchScoreProcessor();
 
diff --git a/osu.Game.Rulesets.Mania/ManiaRuleset.cs b/osu.Game.Rulesets.Mania/ManiaRuleset.cs
index f45a2517df..b391c64572 100644
--- a/osu.Game.Rulesets.Mania/ManiaRuleset.cs
+++ b/osu.Game.Rulesets.Mania/ManiaRuleset.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using System;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mania.Mods;
@@ -47,7 +45,7 @@ namespace osu.Game.Rulesets.Mania
         /// </summary>
         public const int MAX_STAGE_KEYS = 10;
 
-        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod> mods = null) => new DrawableManiaRuleset(this, beatmap, mods);
+        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod>? mods = null) => new DrawableManiaRuleset(this, beatmap, mods);
 
         public override ScoreProcessor CreateScoreProcessor() => new ManiaScoreProcessor();
 
@@ -282,7 +280,7 @@ namespace osu.Game.Rulesets.Mania
 
         public IConvertibleReplayFrame CreateConvertibleReplayFrame() => new ManiaReplayFrame();
 
-        public override IRulesetConfigManager CreateConfig(SettingsStore settings) => new ManiaRulesetConfigManager(settings, RulesetInfo);
+        public override IRulesetConfigManager CreateConfig(SettingsStore? settings) => new ManiaRulesetConfigManager(settings, RulesetInfo);
 
         public override RulesetSettingsSubsection CreateSettings() => new ManiaSettingsSubsection(this);
 
diff --git a/osu.Game.Rulesets.Osu/OsuRuleset.cs b/osu.Game.Rulesets.Osu/OsuRuleset.cs
index 392574ef03..458a0a12f4 100644
--- a/osu.Game.Rulesets.Osu/OsuRuleset.cs
+++ b/osu.Game.Rulesets.Osu/OsuRuleset.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Mods;
@@ -43,7 +41,7 @@ namespace osu.Game.Rulesets.Osu
 {
     public class OsuRuleset : Ruleset, ILegacyRuleset
     {
-        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod> mods = null) => new DrawableOsuRuleset(this, beatmap, mods);
+        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod>? mods = null) => new DrawableOsuRuleset(this, beatmap, mods);
 
         public override ScoreProcessor CreateScoreProcessor() => new OsuScoreProcessor();
 
@@ -236,7 +234,7 @@ namespace osu.Game.Rulesets.Osu
 
         public IConvertibleReplayFrame CreateConvertibleReplayFrame() => new OsuReplayFrame();
 
-        public override IRulesetConfigManager CreateConfig(SettingsStore settings) => new OsuRulesetConfigManager(settings, RulesetInfo);
+        public override IRulesetConfigManager CreateConfig(SettingsStore? settings) => new OsuRulesetConfigManager(settings, RulesetInfo);
 
         protected override IEnumerable<HitResult> GetValidHitResults()
         {
diff --git a/osu.Game.Rulesets.Taiko/TaikoRuleset.cs b/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
index 66fc64c018..19aa3e1016 100644
--- a/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
+++ b/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
@@ -1,8 +1,6 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Mods;
@@ -36,7 +34,7 @@ namespace osu.Game.Rulesets.Taiko
 {
     public class TaikoRuleset : Ruleset, ILegacyRuleset
     {
-        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod> mods = null) => new DrawableTaikoRuleset(this, beatmap, mods);
+        public override DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod>? mods = null) => new DrawableTaikoRuleset(this, beatmap, mods);
 
         public override ScoreProcessor CreateScoreProcessor() => new TaikoScoreProcessor();