Ratchet & Clank: Up Your Arsenal Cheats

Easy one weapon challenges
before doing a challenge in Anihalation Nation that requires you to use a specific weapon, do one theat doesnt. never hit the inferno power up.
just before the challenge ends, hit the inferno box. when you start the next challenge you will be in inferno mode, when it wares off you will have your wrench equipped until you press the O button.