A stand-alone engine for making room transitions in GameMaker: Studio.
GameMaker: Studio added a lot of new things to GameMaker, but sadly it also removed some for compatibility with more devices. One thing which was removed was the built-in transitions.
Now, however, I have made this easy-to-use room transition system for GameMaker: Studio. Just add the transition script and object to your game and you are ready to go!
End User Licence Agreement (EULA).