Cheats for Army Men: Sarges Heroes (PS1)

All Levels:
At the main menu, press and hold Square + L1 + R1 and then press Up, Down, Left, Right.

Debug Menu:
Pause the game and press L1, L2, R1, R2.

Power Up for All Weapons and Infinite Ammo:
While playing, go to pause screen and press Square, Cicle, R1, L1.