Add intro and begin to create central logic nest.

osu.Game/GameModes/Menu/Intro.cs

@@ -0,0 +1,34 @@
+//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 osu.Framework.Audio.Sample;
+using osu.Framework.Audio.Track;
+using osu.Framework.GameModes;
+
+namespace osu.Game.GameModes.Menu
+{
+    class Intro : OsuGameMode
+    {
+        public override void Load()
+        {
+            base.Load();
+
+            AudioSample welcome = Game.Audio.Sample.Get(@"welcome");
+            welcome.Play();
+
+            AudioTrack bgm = Game.Audio.Track.Get(@"circles");
+            bgm.Looping = true;
+
+            Game.Scheduler.AddDelayed(delegate
+            {
+                bgm.Start();
+            }, 600);
+
+            Game.Scheduler.AddDelayed(delegate
+            {
+                Push(new MainMenu());
+            }, 2900);
+        }
+    }
+}

osu.Game/GameModes/Menu/MainMenu.cs

@@ -22,10 +22,6 @@ namespace osu.Game.GameModes.Menu
         private ButtonSystem buttons;
         public override string Name => @"Main Menu";
 
-        protected override bool IsTopLevel => true;
-
-        private AudioTrack bgm;
-
         protected override BackgroundMode CreateBackground() => new BackgroundModeDefault();
 
         public override void Load()
@@ -34,13 +30,6 @@ namespace osu.Game.GameModes.Menu
 
             OsuGame osu = (OsuGame)Game;
 
-            AudioSample welcome = Game.Audio.Sample.Get(@"welcome");
-            welcome.Play();
-
-            bgm = Game.Audio.Track.Get(@"circles");
-            bgm.Looping = true;
-            bgm.Start();
-
             Children = new Drawable[]
             {
                 new ParallaxContainer
@@ -50,6 +39,7 @@ namespace osu.Game.GameModes.Menu
                     {
                         buttons = new ButtonSystem()
                         {
+                            Alpha = 0,
                             OnChart = delegate { Push(new ChartListing()); },
                             OnDirect = delegate { Push(new OnlineListing()); },
                             OnEdit = delegate { Push(new EditSongSelect()); },
@@ -68,6 +58,8 @@ namespace osu.Game.GameModes.Menu
                     }
                 }
             };
+
+            buttons.FadeIn(500);
         }
 
         protected override void OnSuspending(GameMode next)

osu.Game/OsuGame.cs

@@ -1,7 +1,9 @@
 //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 osu.Framework.Configuration;
+using osu.Framework.GameModes;
 using osu.Game.Configuration;
 using osu.Game.GameModes.Menu;
 using OpenTK;
@@ -18,7 +20,8 @@ namespace osu.Game
     public class OsuGame : OsuGameBase
     {
         public Toolbar Toolbar;
-        public MainMenu MainMenu;
+        public MainMenu MainMenu => intro?.ChildGameMode as MainMenu;
+        private Intro intro;
 
         public Bindable<PlayMode> PlayMode;
 
@@ -34,18 +37,51 @@ namespace osu.Game
             base.Load();
 
             Add(new Drawable[] {
-                MainMenu = new MainMenu(),
+                intro = new Intro(),
                 Toolbar = new Toolbar
                 {
-                    OnHome = delegate { MainMenu.MakeCurrent(); },
+                    OnHome = delegate { MainMenu?.MakeCurrent(); },
                     OnSettings = delegate { Options.PoppedOut = !Options.PoppedOut; },
                     OnPlayModeChange = delegate (PlayMode m) { PlayMode.Value = m; },
+                    Alpha = 0.001f //fixes invalidation fuckup
                 },
             });
 
+            intro.ModePushed += modeAdded;
+
             PlayMode = Config.GetBindable<PlayMode>(OsuConfig.PlayMode);
             PlayMode.ValueChanged += delegate { Toolbar.SetGameMode(PlayMode.Value); };
             PlayMode.TriggerChange();
+
+            Cursor.Alpha = 0;
+        }
+
+        public Action<GameMode> ModeChanged;
+
+        private void modeChanged(GameMode newMode)
+        {
+            //central game mode change logic.
+            if (newMode is Player)
+                Toolbar.FadeOut(100);
+            else
+                Toolbar.FadeIn(100);
+
+            Cursor.FadeIn(100);
+
+            ModeChanged?.Invoke(newMode);
+        }
+
+        private void modeAdded(GameMode newMode)
+        {
+            newMode.ModePushed += modeAdded;
+            newMode.Exited += modeRemoved;
+
+            modeChanged(newMode);
+        }
+
+        private void modeRemoved(GameMode newMode)
+        {
+            modeChanged(newMode);
         }
 
         public override bool Invalidate(Invalidation invalidation = Invalidation.All, Drawable source = null, bool shallPropagate = true)

osu.Game/osu.Game.csproj

@@ -73,6 +73,7 @@
     <Compile Include="GameModes\Charts\ChartInfo.cs" />
     <Compile Include="GameModes\Edit\Editor.cs" />
     <Compile Include="GameModes\GameModeWhiteBox.cs" />
+    <Compile Include="GameModes\Menu\Intro.cs" />
     <Compile Include="GameModes\Menu\ButtonSystem.cs" />
     <Compile Include="GameModes\Menu\MainMenu.cs" />
     <Compile Include="GameModes\Multiplayer\Lobby.cs" />