Army Men: Sarge's War
Alternate Lighting
Pause the game, then hold L1 and press Up, Right, Up, Down, O.
Unlock All Available Weapons
Pause the game, then hold L1 and press Right, O, O, Triangle, O.
Invisible Mode
Pause the game, then hold L1 and press Up, Left, Right, Up, O.
Fish Eye Lens
Pause the game, then hold L1 and press Left, Up, Right, Down, O.
Beagle Holes, Footprint and Burns
Pause the game, then hold L1 and press Down, Up, O, Triangle, O.
Alternate Fade
Pause the game, then hold L1 and press Right, Up, Up, Down, O.
Slow Motion Mode
Pause the game, then hold L1 and press Left, Down, Up, Right, O.
The database at Game Oak contains more information regarding Army Men: Sarge's War for Sony PlayStation 2.