[+] Play "Master" difficulty on Demo screen

AquaMai/AquaMai.csproj

@@ -273,6 +273,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Main.cs" />
     <Compile Include="UX\CustomVersionString.cs" />
+    <Compile Include="UX\DemoMaster.cs" />
     <Compile Include="UX\DisableReboot.cs" />
     <Compile Include="UX\LoadJacketPng.cs" />
     <Compile Include="UX\LoadAssetBundleWithoutManifest.cs" />

AquaMai/AquaMai.toml

@@ -26,6 +26,8 @@ LoadAssetBundleWithoutManifest=true
 SkipEventInfo=true
 # Random BGM, put Mai2Cue.{acb,awb} of old version of the game in `LocalAssets\Mai2Cue` and rename them
 RandomBgm=false
+# Play "Master" difficulty on Demo screen
+DemoMaster=true
 # Execute some command on game idle or on game start
 ExecOnIdle=""
 ExecOnEntry=""

AquaMai/Config.cs

@@ -23,6 +23,7 @@ namespace AquaMai
             public bool LoadAssetBundleWithoutManifest { get; set; }
             public bool QuickSkip { get; set; }
             public bool RandomBgm { get; set; }
+            public bool DemoMaster { get; set; }
             public string CustomVersionString { get; set; }
             public string ExecOnIdle { get; set; }
             public string ExecOnEntry { get; set; }

AquaMai/UX/DemoMaster.cs

@@ -0,0 +1,27 @@
+using DB;
+using HarmonyLib;
+using MAI2.Util;
+using Manager;
+using Process;
+
+namespace AquaMai.UX
+{
+    public class DemoMaster
+    {
+        [HarmonyPostfix]
+        [HarmonyPatch(typeof(AdvDemoProcess), "OnStart")]
+        public static void AdvDemoProcessPostStart()
+        {
+            var userOption = Singleton<GamePlayManager>.Instance.GetGameScore(0).UserOption;
+            userOption.NoteSpeed = OptionNotespeedID.Speed7_0;
+        }
+        
+        [HarmonyPrefix]
+        [HarmonyPatch(typeof(GamePlayManager), "InitializeAdvertise")]
+        public static void PreInitializeAdvertise()
+        {
+            GameManager.SelectDifficultyID[0] = 3;
+            GameManager.SelectDifficultyID[1] = 3;
+        }
+    }
+}