diff --git a/Common/Data/Excel/Rogue3DDifficultExcel.cs b/Common/Data/Excel/Rogue3DDifficultExcel.cs
new file mode 100644
index 0000000..150909e
--- /dev/null
+++ b/Common/Data/Excel/Rogue3DDifficultExcel.cs
@@ -0,0 +1,17 @@
+using Newtonsoft.Json;
+
+namespace MikuSB.Data.Excel;
+
+[ResourceEntity("server_01_difficult.json")]
+public class Rogue3DDifficultExcel : ExcelResource
+{
+    [JsonProperty("DifficultID")] public uint DifficultId { get; set; }
+    [JsonProperty("GameplayGroup")] public List<uint> GameplayGroup { get; set; } = [];
+
+    public override uint GetId() => DifficultId;
+
+    public override void Loaded()
+    {
+        GameData.Rogue3DDifficultData[DifficultId] = this;
+    }
+}
diff --git a/Common/Data/GameData.cs b/Common/Data/GameData.cs
index ef3631f..c21fe8f 100644
--- a/Common/Data/GameData.cs
+++ b/Common/Data/GameData.cs
@@ -15,6 +15,7 @@ public static class GameData
     public static Dictionary<uint, ChapterLevelExcel> ChapterLevelData { get; private set; } = [];
     public static Dictionary<uint, ArItemExcel> ArItemData { get; private set; } = [];
     public static Dictionary<uint, ManifestationExcel> ManifestationData { get; private set; } = [];
+    public static Dictionary<uint, Rogue3DDifficultExcel> Rogue3DDifficultData { get; private set; } = [];
 }
 
 public static class GameResourceTemplateId
diff --git a/GameServer/Server/CallGS/Handlers/Rogue3D/Rogue3D_SelectDiff.cs b/GameServer/Server/CallGS/Handlers/Rogue3D/Rogue3D_SelectDiff.cs
index ac133c3..5ab1911 100644
--- a/GameServer/Server/CallGS/Handlers/Rogue3D/Rogue3D_SelectDiff.cs
+++ b/GameServer/Server/CallGS/Handlers/Rogue3D/Rogue3D_SelectDiff.cs
@@ -1,10 +1,10 @@
+using MikuSB.Data;
 using MikuSB.Database.Player;
 using MikuSB.GameServer.Game.Player;
 using MikuSB.Proto;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
-
 namespace MikuSB.GameServer.Server.CallGS.Handlers.Rogue3D;
 
 // Selects the Rogue3D difficulty.
@@ -18,16 +18,6 @@ public class Rogue3D_SelectDiff : ICallGSHandler
     private const uint CurDiffSid = 5;
     private const uint GameplayIdSid = 6;
 
-    // First gameplay group per difficulty (from server_01_difficult.txt, GameplayGroup column)
-    private static readonly Dictionary<uint, uint> DiffToGameplayGroup = new()
-    {
-        { 1,   100 },
-        { 2,   200 },
-        { 3,   300 },
-        { 4,   400 },
-        { 100, 811 },
-    };
-
     public async Task Handle(Connection connection, string param, ushort seqNo)
     {
         var req = JsonSerializer.Deserialize<SelectDiffParam>(param);
@@ -37,7 +27,7 @@ public class Rogue3D_SelectDiff : ICallGSHandler
             return;
         }
 
-        if (!DiffToGameplayGroup.TryGetValue(req.DiffId, out var gameplayGroup))
+        if (!GameData.Rogue3DDifficultData.TryGetValue(req.DiffId, out var cfg) || cfg.GameplayGroup.Count == 0)
         {
             await CallGSRouter.SendScript(connection, "Rogue3D_SelectDiff", "{\"sErr\":\"rogue3.massage_gameProcessError\"}");
             return;
@@ -47,7 +37,7 @@ public class Rogue3D_SelectDiff : ICallGSHandler
         var sync = new NtfSyncPlayer();
 
         SetAttr(player, CurDiffSid, req.DiffId, sync);
-        SetAttr(player, GameplayIdSid, gameplayGroup, sync);
+        SetAttr(player, GameplayIdSid, cfg.GameplayGroup[0], sync);
 
         await CallGSRouter.SendScript(connection, "Rogue3D_SelectDiff", "{}", sync);
     }