Go to the Cheat Menu in the Options menu and enter the following codes: 

DAJIGSUP - List of Cheats (It will show all the cheats available)
WAAAAAAH - Topsy Turvy (Flip Screen)
AMATINEE - View any Movies
MISSIONS - Play any Level
PRAYTOME - God Mode
SHIELDME - Invincible
NDMRBLTS - Inf Ammo
SHOESIZE - Big Boots
EATGRENZ - Big Hands
VERYHIIQ - Big Heads
AMBULNCE - Fill Health Bar
SHOOTMOR - Fill Ammo