Cheat codes:
     Enter these at the main menu.

Invincibility:
     L2, R2, R1, L1, R2, L2, R2, R1, L1, R2.

99 lives:
     Up, Up, Down, Left, Right, Square, Up, Left, Right, Circle.

All levels:
     Up, Up, Square, Down, Down, Circle, Left, Square, Right, Circle.

Level select:
     R2, R2, R2, R2, R1, L1, L1, L1, R1, R2.

All morphs:
     Circle, R2, Circle, Left, Right, R2, Up, Down, Circle, R2.

+1000 Pick-ups:
     Square, R2, Circle, Left, Up, Down, Right, Square, L2, Circle.

+10 Muppet Tokens:
     Left, Up, Down, Right, Square, R2, Circle, Square, L2, Circle.

Ballistic chicken weapon:
     Square,  Square,  Circle, Square, Circle, Circle, Square, Square,
Circle, Square.

Unlimited sub-game time:
     Down, L2, R2, R2, Up, L1, L1, R1, Down, Up.

Unlock gallery:
     Square, Left, Circle, Right, Down, Up, Square, Down, Circle, Down.

Debug info:
     Up, Right, R2, Square, Left, R1, Left, Up, Left, L2.

Fly cam:
     Square, Left, R2, Up, R1, L2, R1, Up, R2, Up.