This is the retail version of the original Commander Keen trilogy. You play the role of Billy Blaze, an 8-year old superkid who dons his brother's football helmet and becomes Commander Keen - Defender of the Earth. This trilogy is comprised of the episodes: Marooned on Mars, The Earth Explodes and Keen Must Die! In each game, Commander Keen battles aliens and monsters, wanders through mazes and solves simple puzzles to complete levels. All 3 games are based on the same classic EGA scrolling platform game engine, so the gameplay is consistent through the series. Each of these games is featured here independently. Less