Cheats42.net

Cheat mode
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Enter Y, X, B, X, Y, A, B, A at the cheats screen under
the options menu to unlock all cheats.
All options
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Enter B, B, A, A, Y, X, Y, X at the cheats screen under
the options menu. All normal game options will be unlocked.
Level select
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Enter X, Y, A, B, Y, X, A, A at the cheats screen under
the options menu.
Super health
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Enter A, A, Y, B, Y, B, X at the cheats screen under the options menu.
Infinite ammunition
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Enter Y, B, A, X, Y, X, A, B at the cheats screen under the options menu.
Infinite grenades
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Enter X, A, X, Y, A, X, A, X at the cheats screen under the options menu.
Bouncy grenades
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Enter X, X, X, X, X, X, X, X at the cheats screen under the options menu.
Gibby explosions
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Enter B, X, A, Y, B, X, A, Y at the cheats screen under the options menu.
Gibby ammunition
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Enter A, A, A, A, X, Y, A, A at the cheats screen under the options menu.
Rapid rails
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Enter X, Y, X, Y, A, A, B, B at the cheats screen under the options menu.
Fat mode
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Enter X, X, X, X, B, A, X, X at the cheats screen under the options menu.
Walking dead
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Enter A, A, A, A, A, A, A, A at the cheats screen under the options menu.
Wacky deaths
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Enter B, B, B, B, B, B, B, B at the cheats screen under the options menu.
Rain of fire
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Enter Y, Y, Y, Y, Y, Y, Y, Y at the cheats screen under the options menu.
Directors cut
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Enter Y, A, X, B, X, A, Y, B at the cheats screen under the options menu.
Joke message
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Enter Y, A, Y, A, Y, A, Y, A at the cheats screen under the options menu.
Make "Congratulations. You won the game!" appear
Go to the Extras/Cheats screen, and enter YAYA as a code.
A message will appear that says, "Congratulations.
You won the game!", but not much else will occur.
(Complete the game to see the full ending)