At any time during the game, press START to pause the game, then enter of the following codes.

Effect	Code
Enemies can't hit you	Up, Up, Down, Down, Left, Right, Left, Right.
Remove graphics from the screen	Up, Down, Up, Down, Up, Down, L, R.
Super Jump	L, R, L, R, Up, Up, Down, Down.
Super Speeed	Right, Right, Right, Left, Left, Left, Up, Down.