Movie Player
PSX: At the title screen, hold R1 and press up, left, right, square, circle, triangle, sqaure, right, left, up, right.
  PC: At the title screen, hold SHIFT and press up, left, right, left, right, left, right, down
Description: This code will let you view all the FMV movie sequences in the game.

Level Select
PSX: At the title screen, hold R1 and press down, right, left, right, square, circle, sqaure, triangle, circle, square, right, left.
  PC: At the title screen, hold SHIFT and press down, right, left, right, left, right, left, up.
Description: As the title exclaims, this code will let you select a level to play.

Voice Cheat
PSX: At the title screen, hold R1 (as if you didn't know!) and press triangle, up, circle, left, x, down, square, right.
  PC: Unknown
Description: This thingy will let you get past those password asking Mudokons with ease!

Green Fart
PSX: At the title screen, hold R1 (boy is this getting old) and press up, left, right, square, circle, x.
  PC: Unknown
Description: This little bugger will make a cloud of green mist come out of Abe's ass whenever he farts.