Cosmic Cruiser comes packaged in Imagine's new cassette design with a profile of the programmer and detailed instructions and game objectives. Essentially you have parked your Cosmic Cruiser underneath an Earth-owned space station which has been overrun by aliens. Your task is to rescue the captured crew and bring them to the safety of your Cruiser. Your ship is equipped with a laser canon and a hatch, and you also have a laser hand gun. Cosmic Cruiser is not a moving game in the sense that the ships fly about; both your ship and the space station remain static. The object is to shoot open one of the hatches in the station which line a revolving outer wheel. This is done with the canon. You can then fly up to the opened hatch and dive in. The scene cuts to the interior. If you are lucky the compartment will contain a crewman, and after blasting the alien guards, you can drag him to the safety of your ship.
But not all the compartments contain crewmen. You will have to kill all the aliens before you can leave. Outside, the aliens are gathering. There may be fighters which will bomb you and the warriors from the station may come after you. Firing the hand gun while carrying a crewman will result in his floating away from you.
Progression from level to level is either by time or by rescuing eight crewmen. Bonus points are awarded after each level. As the levels progress the enemy become nastier.