Turbo mode
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Pause the game, hold L and press Y, B, X, X.
Welsh mode
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Pause the game, hold L and press Y, Y, Y, Y.
Enable 'Real Controls’
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Pause the game, hold L and press Y, Y, Y, B.
1st person mode
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Pause the game, hold L and press Y, B, Y, B.
Squeaky voices
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Pause the game, hold L and press Y, X, Y, Y.