Halo: Combat Evolved (commonly known as Halo or Halo 1) is a first-person shooter (FPS) video game developed by Bungie Studios. The first game of the Halo series, it was released on November 15, 2001 as a launch title for the original Xbox, and is considered the platform's "killer app." With more than five million copies sold worldwide as of November 9, 2005, Microsoft released versions of the game for Microsoft Windows (developed by Gearbox Software) and Mac OS X in 2003, and the surrounding st
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