BULLETZAP
Bullet Shield-Enemy bullets cannot harm you, but punches, tanks, etc can.
HABRDASHR
Men With Hats-Enemies walk around wearing different ammunition (that becomes
collectable after killing them) as hats.
Invincibility
On your controller, hit Start at the beginning of a level to pause the game.
Then hit: Square, L1, Circle, R1, Triangle, L2, Select, R2 & the game will
un-pause with you playing the game invulnerably.
Infinite Ammo
On your controller, hit Start any time to pause the game. Then hit: Circle, L2,
Square, L1, Select, R2, Triangle, Select & the game will un-pause with full ammo
for all in-level weapons.