Pause the game and enter any of the following button presses.
Change Klaymen's Color: Press L2, Cir, Cir, Left, Select, L2, Up, Down.
Clean Pause Screen: Press L2, Left, Cir, R2, Down, Square, Tri, Down.
Fire Heads, Not Bullets: Press Down, Square, Tri, Down, Down, Square, Square, Right.
Hyper Speed: Press Left, Square, R2, Cir, R1, Down, Cir, R2.
Shadow Klaymen: Press Down, Right, Tri, L2, Up, Left, Tri, Select.
Skip to the Next Stage: Press Tri, L1, L1, Square, Right, Cir, Tri, Down.
Slow-Motion: Press L1, Tri, Left, Down, R2, Tri, Left, Select.
Small Klaymen: Press R1, Left, Square, Tri, R1, Left, Square, Tri.
Secret Stage Password Enter the password L1 to access a secret stage, Skullmonkey Gates.
Eric Cunningham
via Internet