Note:  You  have  to beat the levels with at a 5 star rank before
you can use the codes. Helium hunters:

At the main menu, press R1, R1, Triangle, Circle, Square, l2, L1, Down. 

Invincibility:
     At  the  main  menu,  press Square, Square, Square, Down, Square,
Down, Circle, Up.

Fully equipped:
     At the main menu, press R1, R2, L1, l2, Down, Up, Left, Up.

Monkey skin:
     At  the  main  menu,  press  Square,  Square, R2, Down, Triangle,
Square, Circle, Down.

Piggsy skin:
     At the main menu, press Up, Down, Left, Left, R1, R2, L1, L1.

Rabbit skin:
     At the main menu, press Left, R1, R1, Tiangle, R1, R1, Square, L1.

Regenerate:
     At the main menu, press R2, Right, Circle, R2, l2, Down, Circle, Left.

Runner:
     At the main menu, press R2, R2, L1, R2, Left, Right, Left, Right.

Silence:
     At the main menu, press R1, L1, R1, L1, Right, Left, Left, Left.

Super punch:
     At the main menu, press L1, Triangle, Triangle, Triangle, Circle,
Circle, Circle, R1.

Unlock Bonus Level "Monkey See, Monkey Die":
     Beat the game once

Unlock Artwork and More:
     Earn  3-stars  on  any  level  to unlock a piece of artwork. Each
piece of artwork has half of a code on it. Combine the Left bonus code
with the Right bonus code to get the cheat codes (shown above).