comeon you guys have never seen outside tiles used inside before?! tons of people make levels like that and tehy come out great....i dont mean make an outside level with walls around it, just used stuff like water and whatnot, like look at mine in the second post, it just has some flowing water in it with some lilypads and stuff, its fun to make stuff like that, its a bit different ya know? Just give it a shot, it'll be fun, and with the 1337 mofo level makers in here they'll prolly come out really good.
