diff --git a/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs b/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs
index 5c64643fd4d0..80bf2234724c 100644
--- a/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs
+++ b/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs
@@ -8,7 +8,7 @@
 
 namespace osu.Game.Rulesets.Catch.Difficulty
 {
-    public class CatchDifficultyAttributes : DifficultyAttributes
+    public interface ICatchDifficultyAttributes : IDifficultyAttributes
     {
         /// <summary>
         /// The perceived approach rate inclusive of rate-adjusting mods (DT/HT/etc).
@@ -16,6 +16,12 @@ public class CatchDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods don't directly affect the approach rate difficulty value, but have a perceived effect as a result of adjusting audio timing.
         /// </remarks>
+        public double ApproachRate { get; set; }
+    }
+
+    public class CatchDifficultyAttributes : DifficultyAttributes, ICatchDifficultyAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("approach_rate")]
         public double ApproachRate { get; set; }
 
diff --git a/osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceAttributes.cs b/osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceAttributes.cs
index 1335fc2d2341..caa622e99188 100644
--- a/osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceAttributes.cs
+++ b/osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceAttributes.cs
@@ -5,7 +5,11 @@
 
 namespace osu.Game.Rulesets.Catch.Difficulty
 {
-    public class CatchPerformanceAttributes : PerformanceAttributes
+    public interface ICatchPerformanceAttributes : IPerformanceAttributes
+    {
+    }
+
+    public class CatchPerformanceAttributes : PerformanceAttributes, ICatchPerformanceAttributes
     {
     }
 }
diff --git a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs
index db60e757e111..78494272b506 100644
--- a/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs
+++ b/osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs
@@ -8,7 +8,7 @@
 
 namespace osu.Game.Rulesets.Mania.Difficulty
 {
-    public class ManiaDifficultyAttributes : DifficultyAttributes
+    public interface IManiaDifficultyAttributes : IDifficultyAttributes
     {
         /// <summary>
         /// The hit window for a GREAT hit inclusive of rate-adjusting mods (DT/HT/etc).
@@ -16,6 +16,12 @@ public class ManiaDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods do not affect the hit window at all in osu-stable.
         /// </remarks>
+        public double GreatHitWindow { get; set; }
+    }
+
+    public class ManiaDifficultyAttributes : DifficultyAttributes, IManiaDifficultyAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("great_hit_window")]
         public double GreatHitWindow { get; set; }
 
diff --git a/osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceAttributes.cs b/osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceAttributes.cs
index 64f8b026c2aa..0557e8674359 100644
--- a/osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceAttributes.cs
+++ b/osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceAttributes.cs
@@ -7,8 +7,14 @@
 
 namespace osu.Game.Rulesets.Mania.Difficulty
 {
-    public class ManiaPerformanceAttributes : PerformanceAttributes
+    public interface IManiaPerformanceAttributes : IPerformanceAttributes
     {
+        public double Difficulty { get; set; }
+    }
+
+    public class ManiaPerformanceAttributes : PerformanceAttributes, IManiaPerformanceAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("difficulty")]
         public double Difficulty { get; set; }
 
diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs
index a3c0209a08f3..53045baf05d7 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs
@@ -11,31 +11,27 @@
 
 namespace osu.Game.Rulesets.Osu.Difficulty
 {
-    public class OsuDifficultyAttributes : DifficultyAttributes
+    public interface IOsuDifficultyAttributes : IDifficultyAttributes
     {
         /// <summary>
         /// The difficulty corresponding to the aim skill.
         /// </summary>
-        [JsonProperty("aim_difficulty")]
         public double AimDifficulty { get; set; }
 
         /// <summary>
         /// The difficulty corresponding to the speed skill.
         /// </summary>
-        [JsonProperty("speed_difficulty")]
         public double SpeedDifficulty { get; set; }
 
         /// <summary>
         /// The number of clickable objects weighted by difficulty.
         /// Related to <see cref="SpeedDifficulty"/>
         /// </summary>
-        [JsonProperty("speed_note_count")]
         public double SpeedNoteCount { get; set; }
 
         /// <summary>
         /// The difficulty corresponding to the flashlight skill.
         /// </summary>
-        [JsonProperty("flashlight_difficulty")]
         public double FlashlightDifficulty { get; set; }
 
         /// <summary>
@@ -43,13 +39,10 @@ public class OsuDifficultyAttributes : DifficultyAttributes
         /// A value closer to 1.0 indicates most of <see cref="AimDifficulty"/> is contributed by hitcircles.
         /// A value closer to 0.0 indicates most of <see cref="AimDifficulty"/> is contributed by sliders.
         /// </summary>
-        [JsonProperty("slider_factor")]
         public double SliderFactor { get; set; }
 
-        [JsonProperty("aim_difficult_strain_count")]
         public double AimDifficultStrainCount { get; set; }
 
-        [JsonProperty("speed_difficult_strain_count")]
         public double SpeedDifficultStrainCount { get; set; }
 
         /// <summary>
@@ -58,7 +51,6 @@ public class OsuDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods don't directly affect the approach rate difficulty value, but have a perceived effect as a result of adjusting audio timing.
         /// </remarks>
-        [JsonProperty("approach_rate")]
         public double ApproachRate { get; set; }
 
         /// <summary>
@@ -67,7 +59,6 @@ public class OsuDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods don't directly affect the overall difficulty value, but have a perceived effect as a result of adjusting audio timing.
         /// </remarks>
-        [JsonProperty("overall_difficulty")]
         public double OverallDifficulty { get; set; }
 
         /// <summary>
@@ -89,6 +80,57 @@ public class OsuDifficultyAttributes : DifficultyAttributes
         /// The number of spinners in the beatmap.
         /// </summary>
         public int SpinnerCount { get; set; }
+    }
+
+    public class OsuDifficultyAttributes : DifficultyAttributes, IOsuDifficultyAttributes
+    {
+        /// <inheritdoc/>
+        [JsonProperty("aim_difficulty")]
+        public double AimDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("speed_difficulty")]
+        public double SpeedDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("speed_note_count")]
+        public double SpeedNoteCount { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("flashlight_difficulty")]
+        public double FlashlightDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("slider_factor")]
+        public double SliderFactor { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("aim_difficult_strain_count")]
+        public double AimDifficultStrainCount { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("speed_difficult_strain_count")]
+        public double SpeedDifficultStrainCount { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("approach_rate")]
+        public double ApproachRate { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("overall_difficulty")]
+        public double OverallDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        public double DrainRate { get; set; }
+
+        /// <inheritdoc/>
+        public int HitCircleCount { get; set; }
+
+        /// <inheritdoc/>
+        public int SliderCount { get; set; }
+
+        /// <inheritdoc/>
+        public int SpinnerCount { get; set; }
 
         public override IEnumerable<(int attributeId, object value)> ToDatabaseAttributes()
         {
diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceAttributes.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceAttributes.cs
index 0aeaf7669f68..602b5f59e1ca 100644
--- a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceAttributes.cs
+++ b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceAttributes.cs
@@ -7,20 +7,38 @@
 
 namespace osu.Game.Rulesets.Osu.Difficulty
 {
-    public class OsuPerformanceAttributes : PerformanceAttributes
+    public interface IOsuPerformanceAttributes : IPerformanceAttributes
     {
+        public double Aim { get; set; }
+
+        public double Speed { get; set; }
+
+        public double Accuracy { get; set; }
+
+        public double Flashlight { get; set; }
+
+        public double EffectiveMissCount { get; set; }
+    }
+
+    public class OsuPerformanceAttributes : PerformanceAttributes, IOsuPerformanceAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("aim")]
         public double Aim { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("speed")]
         public double Speed { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("accuracy")]
         public double Accuracy { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("flashlight")]
         public double Flashlight { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("effective_miss_count")]
         public double EffectiveMissCount { get; set; }
 
diff --git a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs
index c8f0448767e8..7c420b9bddd2 100644
--- a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs
+++ b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs
@@ -8,36 +8,31 @@
 
 namespace osu.Game.Rulesets.Taiko.Difficulty
 {
-    public class TaikoDifficultyAttributes : DifficultyAttributes
+    public interface ITaikoDifficultyAttributes : IDifficultyAttributes
     {
         /// <summary>
         /// The difficulty corresponding to the stamina skill.
         /// </summary>
-        [JsonProperty("stamina_difficulty")]
         public double StaminaDifficulty { get; set; }
 
         /// <summary>
         /// The ratio of stamina difficulty from mono-color (single colour) streams to total stamina difficulty.
         /// </summary>
-        [JsonProperty("mono_stamina_factor")]
         public double MonoStaminaFactor { get; set; }
 
         /// <summary>
         /// The difficulty corresponding to the rhythm skill.
         /// </summary>
-        [JsonProperty("rhythm_difficulty")]
         public double RhythmDifficulty { get; set; }
 
         /// <summary>
         /// The difficulty corresponding to the colour skill.
         /// </summary>
-        [JsonProperty("colour_difficulty")]
         public double ColourDifficulty { get; set; }
 
         /// <summary>
         /// The difficulty corresponding to the hardest parts of the map.
         /// </summary>
-        [JsonProperty("peak_difficulty")]
         public double PeakDifficulty { get; set; }
 
         /// <summary>
@@ -46,7 +41,6 @@ public class TaikoDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods don't directly affect the hit window, but have a perceived effect as a result of adjusting audio timing.
         /// </remarks>
-        [JsonProperty("great_hit_window")]
         public double GreatHitWindow { get; set; }
 
         /// <summary>
@@ -55,6 +49,36 @@ public class TaikoDifficultyAttributes : DifficultyAttributes
         /// <remarks>
         /// Rate-adjusting mods don't directly affect the hit window, but have a perceived effect as a result of adjusting audio timing.
         /// </remarks>
+        public double OkHitWindow { get; set; }
+    }
+
+    public class TaikoDifficultyAttributes : DifficultyAttributes, ITaikoDifficultyAttributes
+    {
+        /// <inheritdoc/>
+        [JsonProperty("stamina_difficulty")]
+        public double StaminaDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("mono_stamina_factor")]
+        public double MonoStaminaFactor { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("rhythm_difficulty")]
+        public double RhythmDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("colour_difficulty")]
+        public double ColourDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("peak_difficulty")]
+        public double PeakDifficulty { get; set; }
+
+        /// <inheritdoc/>
+        [JsonProperty("great_hit_window")]
+        public double GreatHitWindow { get; set; }
+
+        /// <inheritdoc/>
         [JsonProperty("ok_hit_window")]
         public double OkHitWindow { get; set; }
 
diff --git a/osu.Game.Rulesets.Taiko/Difficulty/TaikoPerformanceAttributes.cs b/osu.Game.Rulesets.Taiko/Difficulty/TaikoPerformanceAttributes.cs
index 7c74e43db19a..584c5b0ace5b 100644
--- a/osu.Game.Rulesets.Taiko/Difficulty/TaikoPerformanceAttributes.cs
+++ b/osu.Game.Rulesets.Taiko/Difficulty/TaikoPerformanceAttributes.cs
@@ -7,17 +7,32 @@
 
 namespace osu.Game.Rulesets.Taiko.Difficulty
 {
-    public class TaikoPerformanceAttributes : PerformanceAttributes
+    public interface ITaikoPerformanceAttributes : IPerformanceAttributes
     {
+        public double Difficulty { get; set; }
+
+        public double Accuracy { get; set; }
+
+        public double EffectiveMissCount { get; set; }
+
+        public double? EstimatedUnstableRate { get; set; }
+    }
+
+    public class TaikoPerformanceAttributes : PerformanceAttributes, ITaikoPerformanceAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("difficulty")]
         public double Difficulty { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("accuracy")]
         public double Accuracy { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("effective_miss_count")]
         public double EffectiveMissCount { get; set; }
 
+        /// <inheritdoc/>
         [JsonProperty("estimated_unstable_rate")]
         public double? EstimatedUnstableRate { get; set; }
 
diff --git a/osu.Game/Rulesets/Difficulty/DifficultyAttributes.cs b/osu.Game/Rulesets/Difficulty/DifficultyAttributes.cs
index 7b6bc37a61f2..f42c8c370f76 100644
--- a/osu.Game/Rulesets/Difficulty/DifficultyAttributes.cs
+++ b/osu.Game/Rulesets/Difficulty/DifficultyAttributes.cs
@@ -9,11 +9,24 @@
 
 namespace osu.Game.Rulesets.Difficulty
 {
+    public interface IDifficultyAttributes
+    {
+        /// <summary>
+        /// The combined star rating of all skills.
+        /// </summary>
+        public double StarRating { get; set; }
+
+        /// <summary>
+        /// The maximum achievable combo.
+        /// </summary>
+        public int MaxCombo { get; set; }
+    }
+
     /// <summary>
     /// Describes the difficulty of a beatmap, as output by a <see cref="DifficultyCalculator"/>.
     /// </summary>
     [JsonObject(MemberSerialization.OptIn)]
-    public class DifficultyAttributes
+    public class DifficultyAttributes : IDifficultyAttributes
     {
         protected const int ATTRIB_ID_AIM = 1;
         protected const int ATTRIB_ID_SPEED = 3;
@@ -36,15 +49,11 @@ public class DifficultyAttributes
         /// </summary>
         public Mod[] Mods { get; set; } = Array.Empty<Mod>();
 
-        /// <summary>
-        /// The combined star rating of all skills.
-        /// </summary>
+        /// <inheritdoc>/>
         [JsonProperty("star_rating", Order = -3)]
         public double StarRating { get; set; }
 
-        /// <summary>
-        /// The maximum achievable combo.
-        /// </summary>
+        /// <inheritdoc>/>
         [JsonProperty("max_combo", Order = -2)]
         public int MaxCombo { get; set; }
 
diff --git a/osu.Game/Rulesets/Difficulty/PerformanceAttributes.cs b/osu.Game/Rulesets/Difficulty/PerformanceAttributes.cs
index e8c4c71913b3..9695f436a05d 100644
--- a/osu.Game/Rulesets/Difficulty/PerformanceAttributes.cs
+++ b/osu.Game/Rulesets/Difficulty/PerformanceAttributes.cs
@@ -6,11 +6,17 @@
 
 namespace osu.Game.Rulesets.Difficulty
 {
-    public class PerformanceAttributes
+    public interface IPerformanceAttributes
     {
         /// <summary>
         /// Calculated score performance points.
         /// </summary>
+        public double Total { get; set; }
+    }
+
+    public class PerformanceAttributes : IPerformanceAttributes
+    {
+        /// <inheritdoc/>
         [JsonProperty("pp")]
         public double Total { get; set; }