Outer-space action, science fiction thrills!
Computer-controlled alien invaders attacking!
You check the Mother Ship radar map, deploy defence.  Ready, aim, fire missiles!
Win the battle, save the day!
 
Two views to work with - Mother Ship radar map and astro fighter cockpit close-up!
Plot your strategy!  Maneuver to engage attackers.  Test your interplanetary marksmanship!
Simulated 3-D motion.  "Stars" in the heavens twinkle!
Simulated sound effects such as "laser" cannons, direct hits, "Disaster Signal", etc..
Fail to beat off the attack and Mankind is done for!.  Win the battle, save the Mother Ship!