At the extras menu (unless marked otherwise), use the D-pad to enter the following:
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Down Left, Up, Left, Right, Down, Left, Up
Unlock All Skins In Multiplayer
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Right, Left, Right, Left, Down, Down, Up, Up
Paintball mode
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down, right, down, right, up, down, up, left
Unlock all levels and multiplayer power-ups/modifiers
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At the Pause Screen: Right Trigger, Right Trigger, Black, White, Black, Right Trigger, Left Trigger, Black
Full Health/Armor
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At the Pause Screen: Left Trigger, Left Trigger, Black, Black, Right Trigger, Black, Left Trigger, White
Unlock all eye powers
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At the Pause Screen: Left Trigger, Right Trigger, Left Trigger, White, White, Black, Right Trigger, White
Recharge goldeneye
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Left, Down, Up, Right, Up, Right, Left, Down
Unlock One Life Mode