Hold L1 + L2 + R1 + Triangle + X + Left when "Press Start" appears at the opening screen. Select the "Start Game" option and choose a level. Your character will have unlimited ammunition and will be invincible during game play. Note: The game cannot be saved when cheat mode is enabled.

Hit a vending machine until the pop cans fall out. Stand over a can and press X to increase your rage meter.

When facing the steel worker at end of level 1, do not let him hit you. Hit him a dozen times and he should fall down and disappear.

When you get to the end of level 2, get the shotgun and shoot one man two times. Then, send a grenade or two flying his way to finish him off. For the other three men, put as many shells as you can in them.