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Halo: Combat Evolved (frequently referred to as simply Halo) is a first-person shooter video game developed by Bungie and published by Microsoft Game Studios. The first game of theHalo franchise, it was released on November 15, 2001 as a launch title for the Xbox gaming system,[1] and is considered the platform's "killer app".[8] With more than five million copiessold worldwide as of November 9, 2005,[9] Microsoft released versions of the game for Microsoft Windows (ported by Gearbox Software) and Mac OS X in 2003, and the surroundingstoryline was adapted and elaborated into a series of novels and comic books. The game was later released as an Xbox Original for download onto an Xbox 360 HDD.

Halo is set in thetwenty-sixth century, with the player assuming the role of the Master Chief, a cybernetically enhanced super-soldier. The player is accompanied by Cortana, an artificial intelligence whooccupies the Master Chief's neural interface. Players battle various aliens on foot and in vehicles as they attempt to uncover the secrets of the eponymous Halo, a ring-shaped artificialplanet. The game has been called "easy to learn",[10] and has been praised for its "engaging story".[11]

Many game magazines have praised Halo as one of the best[12] and mostimportant[13] games of all time. The game's popularity has led to labels such as "Halo clone"[14] and "Halo killer", applied respectively to games either similar to or anticipated to be betterthan it.[15][16] In addition, the game inspired and was used in the fan-created Red vs. Blue video series, which is credited as the "first big success" of machinima[17] (the techniqueof using real-time 3D engines, often from video games, to create animated films). A prequel to the game and Bungie's last Halo title, Halo: Reach, was released on September 14, 2010.