First person mode:
Press Start to pause game play. Then hold L and press Y, B, Y, B. Repeat the code to disable its effect.

Turbo mode:
Press Start to pause game play during a mini-game. Then hold L and press Y, B, X(2). Repeat the code to disable its effect.

Welsh mode:
Press Start to pause game play. Then hold L and press Y(4). Repeat the code to disable its effect.

Enable "Real Controls":
Press Start to pause game play. Then hold L and press Y(3), B. Repeat the code to disable its effect.

Squeaky voices:
Press Start to pause game play. Then hold L and press Y, X, Y(2). Repeat the code to disable its effect.

Mutant mode:
Press Start to pause game play. Then hold L and press Y, B, X(2). To get mutant mode two, repeat the code. To get mutant mode repeat the code again. To disable the code repeat the code one more time.