Halo: Combat Evolved, also referred to as Halo: CE, Halo 1, or simply Halo, is a 2001 first-person shooter video game developed by Bungie and published by Microsoft Game Studios.
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The first game of the Halo franchise, it was released on November 15, 2001 as an exclusive launch title for the Xbox gaming system, and is considered the platform’s “killer app”.
More than five million copies were sold worldwide by November 2005.Microsoft released versions of the game for Microsoft Windows and Mac OS X in 2003, and the surrounding storyline was adapted and elaborated into a series of novels, comic books, and live action web shorts. The game was later released as an Xbox Original for download onto an Xbox 360 HDD