Cheat Mode:
To activate the cheats at the main menu
screen hold L2 and R2 down and press Left, Down, Right and Up. If you have done
the cheat correctly then ti will say CHEATS ON at the bottom of the screen. It
will give you invincirbility and unlimited ammo.
Rapid Fire Press X d40605740040
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Super Jump Press Triangle d40605500010
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Thanks to Revolution readers Ahpschepsut and Michael!