Cheat Codes
For the following codes, start from the title screen, where you see the "Press Start" message. When you input a code, the sound of a gun should tell you the cheat is activated.

Effect	Code
Unlock Trial mode (allows all levels to be used)	tap Up, Down (x2), Right (x3), Left (x4), quickly, hold Triangle and press Start
Unlock Sudden Death mode (single hit kills)	tap L2, R2, L2, R2, Circle, Triangle, Circle, Triangle, hold L1 and press Start
Unlock Max Power mode (Start game with all weapons and unlimited ammo)	tap L1, R2, L2, R2, L2, Triangle, Circle, Triangle, Circle, hold L1 and press Start
Unlock all multiplayer characters	tap Up, Down (x2), Right (x3), Left (x4), hold Circle and press Start

** You want to tap the buttons quickly or else the codes might not work.

Unlocking it for real
When you finish the game on hard difficulty, you unlock the Max Power, Sudden Death, and Trial modes for real. Finish the game on easy and normal to unlock the multiplayer characters for real.

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Cheats

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