diff --git a/osu.Game.Rulesets.Mania/Mods/ManiaModKeyCoop.cs b/osu.Game.Rulesets.Mania/Mods/ManiaModKeyCoop.cs
index 82036d1e82..382eea589c 100644
--- a/osu.Game.Rulesets.Mania/Mods/ManiaModKeyCoop.cs
+++ b/osu.Game.Rulesets.Mania/Mods/ManiaModKeyCoop.cs
@@ -12,7 +12,7 @@ using osu.Game.Rulesets.UI;
 
 namespace osu.Game.Rulesets.Mania.Mods
 {
-    public class ManiaModKeyCoop : Mod, IApplicableToBeatmapConverter<ManiaHitObject>, IApplicableToRulesetContainer<ManiaHitObject>
+    public class ManiaModKeyCoop : Mod, IKeyBindingMod, IApplicableToBeatmapConverter<ManiaHitObject>, IApplicableToRulesetContainer<ManiaHitObject>
     {
         public override string Name => "KeyCoop";
         public override string ShortenedName => "2P";
diff --git a/osu.Game.Rulesets.Mania/UI/ManiaStage.cs b/osu.Game.Rulesets.Mania/UI/ManiaStage.cs
index 15de119342..115a3cadb7 100644
--- a/osu.Game.Rulesets.Mania/UI/ManiaStage.cs
+++ b/osu.Game.Rulesets.Mania/UI/ManiaStage.cs
@@ -193,10 +193,6 @@ namespace osu.Game.Rulesets.Mania.UI
 
         internal void OnJudgement(DrawableHitObject judgedObject, Judgement judgement)
         {
-            var maniaObject = (ManiaHitObject)judgedObject.HitObject;
-            int columnIndex = maniaObject.Column - firstColumnIndex;
-            //Columns[columnIndex].OnJudgement(judgedObject, judgement);
-
             judgements.Clear();
             judgements.Add(new DrawableManiaJudgement(judgement)
             {
diff --git a/osu.Game/Rulesets/UI/Playfield.cs b/osu.Game/Rulesets/UI/Playfield.cs
index 25da00362e..a7fed7059b 100644
--- a/osu.Game/Rulesets/UI/Playfield.cs
+++ b/osu.Game/Rulesets/UI/Playfield.cs
@@ -1,7 +1,6 @@
 // Copyright (c) 2007-2018 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.Framework.Graphics;
 using osu.Framework.Graphics.Containers;