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

Code	Effect
B, B, Left, Up, Down	Refill Health.
B, B, Left, Up, Up	Get 5 Grenades.
C, A, B, A, Left	Gain An Extra Life.
C, C, Left, Up, B	Get a Shotgun.
Left, Right, A, B, B	Level Skip.