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Official Site: Xbox Game Studios

Halo: Combat Evolved is a 2001 first-person shooter video game developed by Bungie and published by Microsoft Game Studios for the Xbox. It was released as a launch game for Microsoft's Xbox video game console on November 15, 2001. The game was ported to Microsoft Windows and Mac OS X in 2003. It was later released as a downloadable Xbox Original for the Xbox 360. Halo is set in the twenty-sixth century, with the player assuming the role of the Master Chief, a cybernetically enhanced supersoldier. The Chief is accompanied by Cortana, an artificial intelligence. Players battle aliens as they attempt to uncover the secrets of the eponymous Halo, a ring-shaped artificial world.

Bungie began the development of what would eventually become Halo in 1997. Initially, the game was a real-time strategy game that morphed into a third-person shooter before becoming a first-person shooter. During development, Microsoft acquired Bungie and turned Halo into a launch game for its first video game console, the Xbox. Halo was a critical and commercial success and is often praised as one of the greatest video games ever made. The game's popularity led to labels such as "Halo clone" and "Halo killer", applied to games either similar to or anticipated to be better than it. Its sequel, Halo 2, was released for the original Xbox in 2004, and the game spawned a multi-billion-dollar multimedia franchise that incorporates games, books, toys, and films.

More than six million copies had been sold worldwide by November 2005. A remaster of the game, Halo: Combat Evolved Anniversary, was released for Xbox 360 by 343 Industries on the 10th anniversary of the original game's launch. Anniversary was re-released alongside the original competitive multiplayer as part of Halo: The Master Chief Collection in 2014.

Halo: Combat Evolved is a first-person shooter (FPS) game in which players primarily experience gameplay in a 3D environment from a first-person view. The player can move around and look up, down, left, or right. The game features vehicles, ranging from armored 4×4s and tanks to alien hovercraft and aircraft, many of which can be controlled by the player. The game switches to a third-person perspective during vehicle use for pilots and mounted gun operators; passengers maintain a first-person view. The game's heads-up display includes a "motion tracker" that registers moving allies, moving or firing enemies, and vehicles, in a certain radius of the player.

UNSC Pillar Of Autumn has not been a contender in any CBUB matches.