Roller Coaster Tycoon Deluxe 

This is the original roller coaster tycoon with both expansion packs ( corkscrew follies and loopy landscapes ) its all in one disk and works perfectly, small file. if you have a slow computer this is a perfect game for you to have, even if you have a fast computer, get it because it's a classic.  Have fun and please seed, its an old game so this is going to be hard to keep alive.