Level skip - To skip a any level in the game, do the following when on that level

Code Effect - Left, Left. Up, Up, Right, Right, Down, Down Level skip

Unlock all Bonus areas - Load a saved game. When the screen that asks if you want to go to the Fantasy Garden or continue your game comes up on screen, press the following:

Code Effect - Down, Down, RIght, Right, Up, Up, Left, Left Unlock all bonus areas