Loaded Cheats

Ammo: 
Down, R, Circle, L, R, Circle

Health: 
R, R, L, Down, Down, Up, Triangle, Circle

Power: 
Down, R, Down, R, Triangle

Lives: 
L, Down, R, Triangle, Square, X,Circle

Smart Bombs:
R1, R2, X, Triangle, Square, Circle, R1, R2, Circle, Circle,    Square

Skip Level: 
X, R1, Triangle, R1, Square, Circle, R2, R2, X, Square, Triangle,    X

These items will now appear permanently on your pause menu. Pause and activate them with X at any time.

Walking Corpse:
Use the code to enable the health option on the pause menu. Then, go and get yourself killed. Just after you bite the bullet, pause the game and renew your health bar. Now, you can walk your dead body around the room you're in - and the meanies are powerless to do anything to you (of course, you cannot do anything to them either) This is especially cool on level 6.

Thanks to Revolution readers Raymond and Bill Schiff!