Press P to pause game play. Hold the Left
Mouse Button and press [F1]. The background will turn
green to confirm correct code entry. Resume game play and press
N to jump to the next level. Note: Repeat this code to
disable this feature.
Move up a level:
Enter the options screen and set the "Hard"
and "6 Credits" options. Press [Space] + N
during game play to move up a level.