diff --git a/osu.Game.Tests/NonVisual/RulesetInfoOrderingTest.cs b/osu.Game.Tests/NonVisual/RulesetInfoOrderingTest.cs
new file mode 100644
index 0000000000..ae999d08d5
--- /dev/null
+++ b/osu.Game.Tests/NonVisual/RulesetInfoOrderingTest.cs
@@ -0,0 +1,38 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Catch;
+using osu.Game.Rulesets.Osu;
+
+namespace osu.Game.Tests.NonVisual
+{
+    [TestFixture]
+    public class RulesetInfoOrderingTest
+    {
+        [Test]
+        public void TestOrdering()
+        {
+            var rulesets = new[]
+            {
+                new RulesetInfo("custom2", "Custom Ruleset 2", string.Empty, -1),
+                new OsuRuleset().RulesetInfo,
+                new RulesetInfo("custom3", "Custom Ruleset 3", string.Empty, -1),
+                new RulesetInfo("custom2", "Custom Ruleset 2", string.Empty, -1),
+                new CatchRuleset().RulesetInfo,
+                new RulesetInfo("custom3", "Custom Ruleset 3", string.Empty, -1),
+            };
+
+            var orderedRulesets = rulesets.OrderBy(r => r);
+
+            // Ensure all customs are after official.
+            Assert.That(orderedRulesets.Select(r => r.OnlineID), Is.EqualTo(new[] { 0, 2, -1, -1, -1, -1 }));
+
+            // Ensure customs are grouped next to each other (ie. stably sorted).
+            Assert.That(orderedRulesets.SkipWhile(r => r.ShortName != "custom2").Skip(1).First().ShortName, Is.EqualTo("custom2"));
+            Assert.That(orderedRulesets.SkipWhile(r => r.ShortName != "custom3").Skip(1).First().ShortName, Is.EqualTo("custom3"));
+        }
+    }
+}
diff --git a/osu.Game/Rulesets/EFRulesetInfo.cs b/osu.Game/Rulesets/EFRulesetInfo.cs
index 9559cfa00c..ba56adac49 100644
--- a/osu.Game/Rulesets/EFRulesetInfo.cs
+++ b/osu.Game/Rulesets/EFRulesetInfo.cs
@@ -42,6 +42,8 @@ namespace osu.Game.Rulesets
 
         public bool Equals(EFRulesetInfo other) => other != null && ID == other.ID && Available == other.Available && Name == other.Name && InstantiationInfo == other.InstantiationInfo;
 
+        public int CompareTo(RulesetInfo other) => OnlineID.CompareTo(other.OnlineID);
+
         public override bool Equals(object obj) => obj is EFRulesetInfo rulesetInfo && Equals(rulesetInfo);
 
         public bool Equals(IRulesetInfo other) => other is RulesetInfo b && Equals(b);
diff --git a/osu.Game/Rulesets/IRulesetInfo.cs b/osu.Game/Rulesets/IRulesetInfo.cs
index 6599e0d59d..44731a2495 100644
--- a/osu.Game/Rulesets/IRulesetInfo.cs
+++ b/osu.Game/Rulesets/IRulesetInfo.cs
@@ -11,7 +11,7 @@ namespace osu.Game.Rulesets
     /// <summary>
     /// A representation of a ruleset's metadata.
     /// </summary>
-    public interface IRulesetInfo : IHasOnlineID<int>, IEquatable<IRulesetInfo>
+    public interface IRulesetInfo : IHasOnlineID<int>, IEquatable<IRulesetInfo>, IComparable<RulesetInfo>
     {
         /// <summary>
         /// The user-exposed name of this ruleset.
diff --git a/osu.Game/Rulesets/RulesetInfo.cs b/osu.Game/Rulesets/RulesetInfo.cs
index f9fa8966a8..0a0941d1ff 100644
--- a/osu.Game/Rulesets/RulesetInfo.cs
+++ b/osu.Game/Rulesets/RulesetInfo.cs
@@ -49,6 +49,20 @@ namespace osu.Game.Rulesets
 
         public bool Equals(IRulesetInfo? other) => other is RulesetInfo b && Equals(b);
 
+        public int CompareTo(RulesetInfo other)
+        {
+            if (OnlineID >= 0 && other.OnlineID >= 0)
+                return OnlineID.CompareTo(other.OnlineID);
+
+            // Official rulesets are always given precedence for the time being.
+            if (OnlineID >= 0)
+                return -1;
+            if (other.OnlineID >= 0)
+                return 1;
+
+            return string.Compare(ShortName, other.ShortName, StringComparison.Ordinal);
+        }
+
         public override int GetHashCode()
         {
             // Importantly, ignore the underlying realm hash code, as it will usually not match.
diff --git a/osu.Game/Rulesets/RulesetStore.cs b/osu.Game/Rulesets/RulesetStore.cs
index 0f518be639..d017d54ed9 100644
--- a/osu.Game/Rulesets/RulesetStore.cs
+++ b/osu.Game/Rulesets/RulesetStore.cs
@@ -163,10 +163,7 @@ namespace osu.Game.Rulesets
                     }
                 }
 
-                // add known official rulesets first..
-                availableRulesets.AddRange(detachedRulesets.Where(r => r.OnlineID >= 0).OrderBy(r => r.OnlineID));
-                // .. then add any customs
-                availableRulesets.AddRange(detachedRulesets.Where(r => r.OnlineID < 0).OrderBy(r => r.ShortName));
+                availableRulesets.AddRange(detachedRulesets.OrderBy(r => r));
             });
         }
 
diff --git a/osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs b/osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs
index 1f346d19f0..fd6a869938 100644
--- a/osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs
+++ b/osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs
@@ -89,7 +89,8 @@ namespace osu.Game.Screens.Select.Carousel
             {
                 default:
                 case SortMode.Difficulty:
-                    int ruleset = BeatmapInfo.Ruleset.OnlineID.CompareTo(otherBeatmap.BeatmapInfo.Ruleset.OnlineID);
+                    int ruleset = BeatmapInfo.Ruleset.CompareTo(otherBeatmap.BeatmapInfo.Ruleset);
+
                     if (ruleset != 0) return ruleset;
 
                     return BeatmapInfo.StarRating.CompareTo(otherBeatmap.BeatmapInfo.StarRating);
diff --git a/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs b/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
index 6156fea769..fc4b6c27f3 100644
--- a/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
+++ b/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs
@@ -39,7 +39,7 @@ namespace osu.Game.Screens.Select.Carousel
 
             beatmapSet.Beatmaps
                       .Where(b => !b.Hidden)
-                      .OrderBy(b => b.Ruleset.OnlineID)
+                      .OrderBy(b => b.Ruleset)
                       .ThenBy(b => b.StarRating)
                       .Select(b => new CarouselBeatmap(b))
                       .ForEach(AddChild);