- Enter following cheats in the mainscreen:
 - for level selection:

right, down, left, up, right, up, down, up, left, up, left, up

 - for 999 lives:

right, up, left, down, right, down, right, left, up, left, up

 - for the end sequence

right, up, left, up, down, up, right, left, up, right, left, down