Go to Extras on the main screen and then once you are in the extras go to passwords.

Password Effect

coolprop 3 props in stunt creator mode
nobleman all items unlocked for construction mode
gfxmodes several new camera effects and styles
kungfoopete unlock all cheats
iceage unlock ice wheels cheat
theduke unlock nitro addiction cheat
imtarex unlock touchable cheat
wearefrozen unlock vision switcher cheat
fastride unlocks the MVX Spartan