Infinite Chainsaw Fuel:
Hold L1 press X, X, Circle, Sqaure, Circle, Sqaure, Triangle.

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Hints

Outta Gas?:
If your out of chaisaw fuel and you need to fight an opponent, keep on pressing L2 and X at the same time. The chinsaw machine will keep on turning on and off and with the help of the button X you keep on attacking on the enemy. After attacking him eight or nine times your chainsaw will get stuck in his stomach. After it gets in press X ones more time and you will hear a sound like "swallow this" then voila he's dead.

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GameShark Codes

Infinite Health
80076c140064  

Infinite Chainsaw Gas
800778700064  

Always Have Access To Inventory Chest
801310a40001
801311cc0001  

Save Anywhere
801312440001
8013124c0001
    

Thanks to Revolution readers Frydaddy, rizwan patel and BUBBALES!