You control a spaceship on a mission to clear 99 sectors of space from hostile aliens. Your ship is equipped with lasers and torpedoes, which are more powerful but have limited use.
The game requires you to destroy fifteen white flying saucers in each sector to progress. As you complete even-numbered sectors up to 16, new types of enemies will appear, making your mission more challenging. Destroying these enemies won't advance the game, but destroying the flying saucers will.
A rejuvinator will occasionally appear, allowing you to earn an extra life if collected. However, be cautious not to accidentally shoot it, as it will turn into an enemy and hinder your progress.