Infinite Ammo At the Title Screen hold L1 + R1 and press CIRCLE, CIRCLE, SQUARE, SQUARE, L2, CIRCLE, L2, SQUARE, SELECT.
Release L1 (but not R1) and press CIRCLE. Release R1 and all weapons will have infinite ammo.
Cheat mode Hold L1 + R1 at the title screen. Keep those buttons held and press Circle(2), Square(2), L2, Circle, L2, Square, Select. Release L1, press Circle, then release R1. Start the game to have all weapons with unlimited ammunition.
