Commander Keen is described as ': Invasion of the Vorticons: Episode 1: Marooned on Mars (Dec. 14th 1990) Episode 2: The Earth Explodes (1991) Episode 3: Keen Must Die! (1991) Commander Keen's very first adventure, and the debut of id's groundbreaking side-scrolling technology'. There are four games similar to Commander Keen for a variety of platforms, including Linux, Windows, Android, Android Tablet and Mac. The best alternative is Jazz Jackrabbit 2, which is free. Other Commander Keen like games are Jazz Jackrabbit (Freemium), Commander Genius (Free, Open Source) and Abe's Amazing Adventure (Free, Open Source).
"JAZZ IS BACK! The nefarious turtle, Devan Shell, has built a time machine as part of a diabolical plan to rewrite Carrotus' past. Now, only our hero along with his spaced-out little brother, Spaz, can stop him from turning history on its ear! Represent entire series of Jazz Jackrabbit 2 games including Jazz Jackrabbit, Jazz Jackrabbit 2, Jazz Jackrabbit 3: Adventures of a Mean Green Hare, Jazz Jackrabbit (GBA).
Jazz Jackrabbit is a platform game developed and published by Epic MegaGames. It was released in 1994 for PCs operating DOS, with subsequent Macintosh and Microsoft Windows releases in 1995 and 1996. Represent entire series of Jazz Jackrabbit games.
"A scrolling, platform-jumping, key-collecting, ancient pyramid exploring game, vaguely in the style of similar games for the Commodore+4. The game is intended to show young people (I'm writing it for my son's birthday) all the cool games they missed."