Basic score flow.

osu.Game.Mode.Osu/OsuRuleset.cs

@@ -17,6 +17,8 @@ namespace osu.Game.Modes.Osu
 
         public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
 
+        public override Score CreateScore() => new OsuScore();
+
         protected override PlayMode PlayMode => PlayMode.Osu;
     }
 }

osu.Game.Mode.Osu/OsuScore.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace osu.Game.Modes.Osu
+{
+    class OsuScore : Score
+    {
+    }
+}

osu.Game.Mode.Osu/osu.Game.Modes.Osu.csproj

@@ -53,6 +53,7 @@
     <Compile Include="Objects\Drawables\Pieces\RingPiece.cs" />
     <Compile Include="Objects\Drawables\Pieces\Triangles.cs" />
     <Compile Include="Objects\OsuHitObjectParser.cs" />
+    <Compile Include="OsuScore.cs" />
     <Compile Include="UI\OsuComboCounter.cs" />
     <Compile Include="UI\OsuHitRenderer.cs" />
     <Compile Include="UI\OsuPlayfield.cs" />

osu.Game.Modes.Catch/CatchRuleset.cs

@@ -18,6 +18,8 @@ namespace osu.Game.Modes.Catch
 
         protected override PlayMode PlayMode => PlayMode.Catch;
 
+        public override Score CreateScore() => new Score();
+
         public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
     }
 }

osu.Game.Modes.Mania/ManiaRuleset.cs

@@ -19,6 +19,8 @@ namespace osu.Game.Modes.Mania
 
         protected override PlayMode PlayMode => PlayMode.Mania;
 
+        public override Score CreateScore() => new Score();
+
         public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
     }
 }

osu.Game.Modes.Taiko/TaikoRuleset.cs

@@ -1,6 +1,7 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System;
 using System.Collections.Generic;
 using osu.Game.Modes.Objects;
 using osu.Game.Modes.Osu.Objects;
@@ -18,6 +19,8 @@ namespace osu.Game.Modes.Taiko
 
         protected override PlayMode PlayMode => PlayMode.Taiko;
 
+        public override Score CreateScore() => new Score();
+
         public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
     }
 }

osu.Game/Modes/Ruleset.cs

@@ -18,6 +18,8 @@ namespace osu.Game.Modes
 
         public abstract ScoreOverlay CreateScoreOverlay();
 
+        public abstract Score CreateScore();
+
         public abstract HitRenderer CreateHitRendererWith(List<HitObject> objects);
 
         public abstract HitObjectParser CreateHitObjectParser();

osu.Game/Modes/Score.cs

@@ -0,0 +1,17 @@
+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace osu.Game.Modes
+{
+    public class Score
+    {
+        public double TotalScore { get; }
+        public double Accuracy { get; }
+    }
+}

osu.Game/Modes/UI/ScoreOverlay.cs

@@ -15,6 +15,7 @@ namespace osu.Game.Modes.UI
         public ComboCounter ComboCounter;
         public ScoreCounter ScoreCounter;
         public PercentageCounter AccuracyCounter;
+        public Score Score { get; set; }
 
         protected abstract KeyCounterCollection CreateKeyCounter();
         protected abstract ComboCounter CreateComboCounter();

osu.Game/Screens/Play/Player.cs

@@ -19,6 +19,7 @@ using OpenTK.Input;
 using MouseState = osu.Framework.Input.MouseState;
 using OpenTK;
 using osu.Framework.GameModes;
+using osu.Game.Screens.Ranking;
 
 namespace osu.Game.Screens.Play
 {
@@ -36,6 +37,8 @@ namespace osu.Game.Screens.Play
         
         private IAdjustableClock sourceClock;
 
+        private Score score;
+
         private Ruleset ruleset;
 
         [BackgroundDependencyLoader]
@@ -84,6 +87,8 @@ namespace osu.Game.Screens.Play
             ruleset = Ruleset.GetRuleset(usablePlayMode);
 
             var scoreOverlay = ruleset.CreateScoreOverlay();
+            scoreOverlay.Score = (score = ruleset.CreateScore());
+
             var hitRenderer = ruleset.CreateHitRendererWith(beatmap.HitObjects);
 
             hitRenderer.OnHit += delegate (HitObject h) { scoreOverlay.OnHit(h); };
@@ -117,6 +122,12 @@ namespace osu.Game.Screens.Play
         {
             base.Update();
             Clock.ProcessFrame();
+
+            if (Beatmap.Track.HasCompleted)
+                Push(new Results
+                {
+                    Score = score
+                });
         }
 
         class PlayerInputManager : UserInputManager

osu.Game/Screens/Ranking/Results.cs

@@ -2,6 +2,7 @@
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Framework.GameModes;
+using osu.Game.Modes;
 using osu.Game.Screens.Backgrounds;
 using OpenTK.Graphics;
 
@@ -22,5 +23,7 @@ namespace osu.Game.Screens.Ranking
             Background.Schedule(() => Background.FadeColour(Color4.White, 500));
             return base.OnExiting(next);
         }
+
+        public Score Score { get; set; }
     }
 }

osu.Game/osu.Game.csproj

@@ -66,6 +66,7 @@
     <Compile Include="Beatmaps\Drawables\BeatmapBackgroundSprite.cs" />
     <Compile Include="Graphics\Cursor\CursorTrail.cs" />
     <Compile Include="Modes\Objects\HitObjectParser.cs" />
+    <Compile Include="Modes\Score.cs" />
     <Compile Include="Overlays\DragBar.cs" />
     <Compile Include="Overlays\MusicController.cs" />
     <Compile Include="Beatmaps\Beatmap.cs" />