500 Bullets-

During a mission, pause the game. At the pause menu, press:

R, Left, L, Right, Up, Select, Right

You should hear a voice sample to confirm the code entry. When you unpause, you will have 500 bullets for every weapon.

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Higher Pitched Voices-

When your in a mission , pause the game and enter the following: R , Left(dpad) , L , Right(dpad) , Up , Select
and L

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Invincibility-

During a mission, pause the game. At the pause menu, type:

R, Left, L, Right, Up , Select, Left

You should hear a voice sample to confirm correct code entry. When you unpause, you will be invincible.

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Unlock All Levels-

During a mission, pause the game. On the pause screen, press:

R, left, L, right, up, select, R

You'll hear a voice sample (''You'll have to do better than that!'') to confirm code entry. When you exit the mission, you'll find that all the levels are unlocked.