Cheats for Army Men 3D (PS1)

Level select
At the main menu, quickly press Square, Circle, R1, L1, L1 + R1.

Invincibility
Pause the game and quickly press Square, Circle, L1, L1 + L2. Then, Sarge will be invincible during the current level. Alternatively, pause the game and press R1, L1, R1 + R2 within two seconds. -From: mss@blazenet.net

All weapons
Pause the game and quickly press Square, Circle, R1, L1, R1 + R2. Then, Sarge will have access to all the weapons during the current level. Alternatively, pause the game and press L1, L1 + L2 within two seconds. -From: mss@blazenet.net

First person view
While playing a game, hold Start + Circle + Square. The game will pause. Press Start to resume the game in the first person view.

Run faster in multi-player mode
Hold Square + Triangle to chase your opponent quicker.