Hints
Different Color
Put on invincibility code, then go find a Greeter. Walk through his motion detector and he will zap you. Do this many many times and you will become a different color. Colors vary. I've had squggly blue and clear outline.

Secret Rooms
Secret rooms or often found behind objects and anywere you see a pile of green glass bottles.

Cheats
Invincibility
While playing a game, hold R1 and press Circle, Triangle, Square, X, Down(3), Circle, Triangle, Square, X.

Green Air Mine
While playing a game, hold R1 and press Up, left, right, Square, circle, X, Than, Abe will produce a green air mine every time he farts.

Path Skip
While playing a game, hold R1 and press Circle(2), X(2), Square(2) to skip to the beginning of the next path. Note: When enabling this code, no FMV sequences will be played. The final level must still be played to advance to the end of the game.

View FMV Sequences
At the main menu, hold R1 and press Up, Down, Left, Right, Square, Circle, Triangle, Circle, Square, Circle, Up, Down, Left, Right.

Level Select
At the main menu, hold R1 and press Down, Up, Left, Right, Triangle, Square, Circle, Triangle, Square, Circle, Down, Up, Left, Right.