The Jupiter Jump

Your spaceship is surrounded by four hostile aliens that want to kill you. Your job is to keep them at bay as long as you can by firing your phaser at each of them. You cannot kill them, but you can keep them from reaching your ship and killing you. Keep them away for so long, and it's on to the next level.

This game was developed by James C. Hilty and released in the following:

-- Commodore Magazine 1987/08

-- Loadstar #038