How do I change rooms?
Can I change the room_speed during gameplay?
room_speed = 60;
Can different rooms have different speeds?
Can I view two rooms at the same time?
No, and it's not likely that this will ever be added to Game Maker.
Why don't room transitions work in Game Maker 7?
The room transitions in Game Maker 7 have been changed. If you created your game with an earlier version of Game Maker, the room transitions may not work. You may have to get a room transition script to get the transition effect you want.