When the picture of Einstein appears the second time, type “MOONUNIT” and press ‘RETURN’. Now use the following keys during play:

‘F1’______________________Forward a level.

‘F2’_________________________Back a level.

‘F3’___________________Forward ten levels.

‘F4’______________________Back ten levels.

There are five ways you can complete a level and gain a hidden bonus:

- Finish a level with the last digit of the timer as a three.

- Complete a level collecting exactly 4 pods.

- Completely fail a bonus level by doing everything wrong.

- Complete a screen without wrapping around the screen.

- Finish a level without rotating your ship right (clockwise).