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Commander Keen 1: Marooned on Mars is a platform video game developed by id Software and published by Apogee Software in 1990 as shareware for MS-DOS. The game follows the adventures of an eight-year-old genius named Billy Blaze, who uses his homemade spaceship to travel to various alien planets to save the Earth from alien invaders known as V...

Commander Keen 5: The Armageddon Machine is a science fiction action oriented platform game designed by Tom Hall, developed by id Software and released by Apogee Software in 1991 for DOS only. Commander Keen 5: The Armageddon Machine is part of the Commander Keen game series, specifically it's the second episode of Commander Keen in Goodbye, Galaxy.