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XBox - Fuzion Frenzy cheats

Enable Mutant mode one and two
Pause the game play, and hold L and push Y, B, X, X. 
Re-enter the cheat code to enable mutant mode two.
Re-enter the cheat code again to disable mutant mode.

First person mode:
Pause the game play by pressing Start button, and hold L and press 
Y, B, Y, B buttons on your controller to activate the first person mode.

Turbo mode:
Pause the game play by pressing Start button, and hold L and press 
Y, B, X, X buttons on your controller to activate the turbo mode.

Welsh mode:
Pause the game play by pressing Start button, and hold L and press 
Y, Y, Y, Y buttons on your controller to enable the welsh mode.

Enable "Real Controls":
Pause the game play by pressing Start button, and hold L and press 
Y, Y, Y, B buttons on your controller to enable Real Controls.

Squeaky voices:
Pause the game play by pressing Start button, and hold L and press 
Y, X, Y, Y buttons on your controller to activate squeaky voices.