Army Men: Sarge's Heroes Codes -

All weapons with unlimited ammunition:
Press Start to pause game play, then quickly press Square, Circle, R1, L1. The words "Power Up!" and a voice will confirm correct code entry.

Level select:
Hold Square + L1 + R1 and press Up, Down, Left, Right at the main menu. A voice will confirm correct code entry.

Unlimited heath:
Hold R1 + L1 and press Square, Triangle, Right, Left, Circle, Square(2), Right at the main menu. A voice will confirm correct code entry.

Hint: Survive falls:
Hold Down when you fall off a cliff or wall and Sarge will slide down the wall.