Enter the following codes at the 'Extras' Screen
Unlock ALL Single and Multi-Player Levels:
Down, Right, Down, Right, Up, Down, Up, Left.
No Eye Powers in Multiplayer:
Up, Up, Down, Left, Right, Right, Left, Down.
Unlock ALL Skins in Multiplayer:
Down, Left, Up, Left, Right, Down, Left, Up.
Unlock Paintball Mode:
Right, Left, Right, Left, Down, Down, Up, Up.
Unlock One-Life Mode:
Left, Down, Up, Right, Up, Right, Left, Down. In-game Codes
Pause gameplay to enter the following codes
Unlock ALL Eye Powers:
L1, L1, R2, R2, R1, R2, L1, L2.
Fully Charge Eye Power:
L1, R1, L1, L2, L2, R2, R1, L2.
Gives you Full Health and Armor:
R1, R1, R2, L2, R2, R1, L1, R2.