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Playstation - Gunfighter - The Legend Of Jesse James cheats

Enable cheat menu
Hold Left thumb-stick at the main menu until a small box appears.
Keep held Left Analog-stick and push Triangle, X, Square, Circle, 
Circle, Square, Triangle, X buttons. Start a game, then push Start 
to bring up the options screen with a cheat menu.

Gunfighter - The Legend Of Jesse James Game Shark Codes: 

More Time (push R1):
D007CD2C F7FF
8007D14A 0E0E
D007CD2C F7FF
8007D14E 0E0E

Never Reload at Train:
800EE8B8 0006

Unlimited Health at Train:
800EE8B4 0005

Never Reload at Town:
800B23D8 0006

Unlimited Health at Town:
800B23D4 0005

Never Reload at Saloon:
800E6CC8 0006

Unlimited Health at Saloon:
800E6CC4 0005

Never Reload at Mine:
800117FA8 0006

Unlimited Health at Mine:
800117FA4 0005

Never Reload at Hanging:
800B84C8 0006

Unlimited Health at Hanging:
800B84C4 0005

Unlimited Bullets in Rolling Rampage:
80184914 0036

Unlimited Bullets in Target Take Down:
80184CD4 0028