The game was later released as an Xbox Original for download onto an Xbox 360 hard drive. 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. More than five million copies were sold worldwide by November 2005. 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'.
Halo: Combat Evolved is a 2001 military science fiction first-person shooter video game developed by Bungie and published by Microsoft.
