Invincibility:
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On the pause menu, press: R, Left, L, Right, Up , Select, Left.
You should hear a voice confirmation.
Unlock All Levels:
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On the pause menu, press: R, left, L, right, up, select, R.
You should hear a voice confirmation.
Instant 500 Bullets:
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On the pause menu, press: R, Left, L, Right, Up, Select, Right.
You should hear a voice confirmation.
Higher Pitched Voices:
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On the pause menu, press: R , Left, L, Right, Up, Select, L.
You should hear a voice confirmation.