diff --git a/AquaMai/UX/SelectionDetail.cs b/AquaMai/UX/SelectionDetail.cs
index 6dd794fe..87325ca2 100644
--- a/AquaMai/UX/SelectionDetail.cs
+++ b/AquaMai/UX/SelectionDetail.cs
@@ -14,52 +14,87 @@ namespace AquaMai.UX;
 
 public class SelectionDetail
 {
-    private static Window window;
-    public static MusicSelectProcess.MusicSelectData SelectData { get; private set; }
-    public static int Difficulty { get; private set; }
+    private static readonly Window[] window = new Window[2];
+    private static MusicSelectProcess.MusicSelectData SelectData { get; set; }
+    private static readonly int[] difficulty = new int[2];
 
     [HarmonyPostfix]
     [HarmonyPatch(typeof(MusicSelectMonitor), "UpdateRivalScore")]
     public static void ScrollUpdate(MusicSelectProcess ____musicSelect, MusicSelectMonitor __instance)
     {
-        if (__instance != ____musicSelect.MonitorArray[0]) return;
-        if (window != null)
+        int player;
+        if (__instance == ____musicSelect.MonitorArray[0])
         {
-            window.Close();
+            player = 0;
         }
+        else if (__instance == ____musicSelect.MonitorArray[1])
+        {
+            player = 1;
+        }
+        else
+        {
+            return;
+        }
+
+        if (window[player] != null)
+        {
+            window[player].Close();
+        }
+
+        var userData = Singleton<UserDataManager>.Instance.GetUserData(player);
+        if (!userData.IsEntry) return;
 
         if (____musicSelect.IsRandomIndex()) return;
 
         SelectData = ____musicSelect.GetMusic(0);
         if (SelectData == null) return;
-        Difficulty = ____musicSelect.GetDifficulty(0);
+        difficulty[player] = ____musicSelect.GetDifficulty(player);
 
-        window = __instance.gameObject.AddComponent<Window>();
+        window[player] = player == 0 ? __instance.gameObject.AddComponent<P1Window>() : __instance.gameObject.AddComponent<P2Window>();
     }
 
-    public class Window : MonoBehaviour
+    private class P1Window : Window
+    {
+        protected override int player => 0;
+    }
+
+    private class P2Window : Window
+    {
+        protected override int player => 1;
+    }
+
+    private abstract class Window : MonoBehaviour
     {
         private GUIWindow window;
+        protected abstract int player { get; }
 
-        private void Start()
+        public void Start()
         {
-            window = GUIWindow.Begin($"ID: {SelectData.MusicData.name.id}", Screen.width / 2f - 100, Screen.height * 0.87f, 200, 50, 10, 22, 5, true, true, true);
+            var x = Screen.width / 2f - 100;
+            if (!AquaMai.AppConfig.UX.SinglePlayer)
+            {
+                var halfPlayerWidth = Screen.height / 1920f * 1080 / 2;
+                x += halfPlayerWidth * (player == 0 ? -1 : 1);
+            }
+
+            window = GUIWindow.Begin($"ID: {SelectData.MusicData.name.id}", x, Screen.height * 0.87f, 200, 50, 10, 22, 5, true, true, true);
             window.Label(MusicDirHelper.LookupPath(SelectData.MusicData.name.id).Split('/').Reverse().ToArray()[3]);
             window.Label(SelectData.MusicData.genreName?.str);
             window.Label(SelectData.MusicData.AddVersion?.str);
-            window.Label($"{SelectData.MusicData.notesData[Difficulty]?.level}.{SelectData.MusicData.notesData[Difficulty]?.levelDecimal}");
+            var notesData = SelectData.MusicData.notesData[difficulty[player]];
+            window.Label($"{notesData?.level}.{notesData?.levelDecimal}");
 
-            var rate = CalcB50(SelectData.MusicData);
+            var rate = CalcB50(SelectData.MusicData, difficulty[player]);
             if (rate > 0)
             {
                 window.Label($"SSS+ => DXRating += {rate}");
             }
         }
 
-        private uint CalcB50(MusicData musicData)
+        private uint CalcB50(MusicData musicData, int difficulty)
         {
-            var newRate = new UserRate(musicData.name.id, Difficulty, 1010000, (uint)musicData.version);
-            var user = Singleton<UserDataManager>.Instance.GetUserData(0);
+            var newRate = new UserRate(musicData.name.id, difficulty, 1010000, (uint)musicData.version);
+            var user = Singleton<UserDataManager>.Instance.GetUserData(player);
             var userLowRate = (newRate.OldFlag ? user.RatingList.RatingList : user.RatingList.NewRatingList).Last();
 
             if (newRate.SingleRate > userLowRate.SingleRate)
@@ -72,7 +107,7 @@ public class SelectionDetail
 
         private void OnGUI()
         {
-            window.Draw();
+            window?.Draw();
         }
 
         public void Close()