Effect:a piece of cheese

How to get it: You have to unlock the rocket launcher, super dragon, foenix or any other gun with explosives in one player cheats.

Go the first level and drop from the roof , killing any one in your way or not, go inside the first room, and go to the security pannel, look to the right a bit, you will see a giant tube...

BLOW IT UP!!, you will unlock a passege down, drop and look at one of the three windows
they have grating, but you can still see the cheese! I haven't found out what it does, but do expertiment!