Army Men: Sarge's War Cheats

All Weapons
Press the following combination when you have paused game-play and are holding the L trigger: Right, X, X, Y, X.
Invisible Mode
Press the following combination when you have paused game-play and are holding the L trigger: Up, Left, Right, Up, X.
If the code has been entered correctly you will see a confirmation message.
Slow-motion Mode
Press the following combination when you have paused game-play and are
holding the L trigger: Left, Down, Up, Right, X.
If the code has been entered correctly you will see a confirmation message.

Pause the game, then hold L and press Up, Right, Up, Down, X. If you entered the code correctly, a message will appear.

Pause the game. Hold L and then press left, down, up, right, X. Then release L.

Pause the game, hold the Left Trigger, then enter the following codes and once entered release the Left Trigger:

Code - Effect
Right, X, X, Y, X - All Weapons
Up, Right, Up, Down, X - Alter Lighting
Down, Up, X, Y, X - Buddy Decals
Left, Up, Right, Down, X - Fish Eye View
Up, Left, Right, Up, X - Invisible Mode
Left, Down, Up, Right, X - Slow Motion
Right, Up, Up, Down, X - Wacky Fade

During gameplay, pause the game and hold the L trigger while pressing RIGHT, X, X, Y, X.