Answer 1: I did something similar to this when I entered last year's july mags. I used objects rather than new rooms, (btw, change your GUI to a popup-modal and turn it off when the game starts). Anyway, make objects that are your game's resolution, then show them one at a time with simple Object On and Object Off commands. Then, when they are all off, your main menu (the actual room background) will be visable. (At this point turn the GUI back on)
Answer 2: I think there's a child function for play music, stop music, etc. But I'm not good with music so someone else would be a better answerer to this one.
Answer 2: I think there's a child function for play music, stop music, etc. But I'm not good with music so someone else would be a better answerer to this one.