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Playstation 2 - Twin Caliber cheats

Unlock Invincibility
During gameplay enter the following codes:
Up, R, Down, L, Up, Down, R, Up, L, Down. 
You must enter this code at each level.

Unlimited Ammo
During gameplay enter the following codes:
L, R, Up, R, Down, Down, R, Up, L, Down. 
You must enter this code at each level.