OK then all you guys have been a great help (and this site rocks!) but Im afraid I need some more help. (Keep in mind that this is my first mapping expereince and that its for school). Now for a start, what files are needed in order to post a map on this site? Please take a look when I do. Now for the problem. In the 'lab' after going down the elevator, theres a bunch of scinetists around and glass tubes (this room is unfinished). Now I want it so that when you go up the stairs to a computer and press the button, an explosion will sound, the level will change slightly and the glass tubes will explode and the monsters emerge and eat the scietists (sound familiar??). How would I go about achieveing this? Please make the respnse as simple as possible, but if you can't don't worry. Thankyou!!