One of the games I played A LOT before i became so totally swamped in the awesomeness of Toribash was Garry's Mod (GMod for short). It's a really cool physics simulator that allows you to spawn various items and make contraptions from them such as turrets or spaceships or... or... GIANT... MECHANICAL...ZOMBIE KILLING ROBOTS? >.>
Anyway, hit my thread if you play. If you don't, I highly recommend you try it.
if you turn on noclip and fly really high up there will be a box with the buildings in the out side of the level, and spawn stuff up there and then go back down, its EPIC!