While playing the game, pause the game and enter one of the following codes for the desired effect.

Effect	Code
Gives 3 gas bombs	L, UP, L, L, A, B, Y.
Gives 5 grenades	Down, R, A, B.
Gives body armor	L, A, R, Down.
Gives extra life	B, Up, R, Y.
Gives pistol	A, R, Up, B, A.
Gives shotgun	A, R, A, B.
Recover health	B, A, R, Down.
Skips level	Y, A, R, Down.