Type the code "zoo" into the code prompt and you will go to a zoo-type facility where you can kill all the animals that are on the game.

Withering Heights (Multi player only)

If you are in the top of the room in one building (not the roof the top room by the switch) and go to the ledge that sticks out side with the grave stone upgrade type thing. Jump off into the trampoline with out the bouncy part missing. It will suddenly appear and you will bounce on the top of the central pillar. You find some items on there. But here's the catch. if you friend finds out you can press that one switch and when your friend is on the piller, a metal cage will trap your friend on it and a giant electricity bolt will come down and blow up your friend.