Army Men - Sarge's War - Platform: XBox

All weapons:
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Pause the game, then hold L and press Right, B(2), Y, B. If you entered the code 
correctly, a message will appear. Note: Only weapons normally available in the 
current level will be unlocked.

Invisible mode:
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Pause the game, then hold L and press Up, Left, Right, Up, B. If you entered the 
code correctly, a message will appear.

Slow-motion mode:
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Pause the game, then hold L and press Left, Down, Up, Right, B. If you entered 
the code correctly, a message will appear.

Fish eye camera:
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Pause the game, then hold L and press Left, Up, Right, Down, B. If you entered 
the code correctly, a message will appear.

Beagle holes, footprints, and burns:
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Pause the game, then hold L and press Down, Up, B, Y, B. If you entered the code 
correctly, a message will appear.

Alternate fade:
---------------
Pause the game, then hold L and press Right, Up(2), Down, B. If you entered the 
code correctly, a message will appear.

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