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Halo is a science fiction video game franchise created by Bungie and owned and published by Microsoft Game Studios. The main trilogy of games center on the experiences of the Master Chief, a cybernetically-enhanced human super-soldier, and his artificial intelligence (AI) companion, Cortana. The Master Chief aids future humanity in battling the Covenant, a theocratic alliance of alien races. In this science fiction setting, the term "Halo" refers to Halo megastructures: large, habitable ringed structures, similar to Larry Niven's ringworlds.

The trilogy of video games have been praised as being among the best first-person shooters on a video game console, and are considered the Microsoft Xbox's "killer app". This has led to the term "Halo killer" being used to describe console games that aspire, or are considered, to be better than Halo. Fuelled by the success of Halo: Combat Evolved, and immense marketing campaigns from publisher Microsoft, both sequels went on to break various sales records. Halo 3 sold more than US$170 million worth of copies in the first twenty-four hours of release, breaking the record set by Halo 2 three years prior. The trilogy of games have sold over 24.8 million copies worldwide.

Strong sales of the games has led to the franchise's expansion to other mediums; there are five bestselling novels, two graphic novels, and other licensed products. Beyond the original trilogy, other "Halo" games have branched off into other genres of play, with different developers; including Halo Wars, a real-time strategy game, Halo: Chronicles, which is being developed by Peter Jackson, Halo 3: ODST and Halo: Reach both prequels to Halo 3. The series' award-winning music was composed by Bungie's own in-house musician Martin O'Donnell, and soundtracks have been released for the entire trilogy. The cultural impact of the Halo series has been compared by writer Brian Bendis to that of Star Wars. The collective group of fans of the series is referred to as the "Halo Nation".
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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 Xbox gaming system, 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 (ported by Gearbox Software) and Mac OS X in 2003, and the surrounding storyline was adapted and elaborated into a series of novels. The game was later released as an Xbox Original for download onto an Xbox 360 HDD.

In Halo's twenty-sixth century setting, the player assumes the role of the Master Chief, a cybernetically enhanced "SPARTAN" super-soldier. The player is accompanied by Cortana, an artificial intelligence who occupies 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 structure. The game has been called "easy to learn", and has been praised for its "engaging story".

Many game magazines have praised Halo as one of the best and most important games of all time. The game's popularity has led to labels such as "Halo clone" and "Halo killer", applied respectively to games either similar to or anticipated to be better than it. 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 the technique of using real-time 3D engines, often from video games, to create animated films.
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Halo 2 is a first-person shooter video game developed by Bungie Studios. Released for the Xbox video game console on November 9, 2004, the game is the second video game title in the Halo franchise and the sequel to 2001's critically-acclaimed Halo: Combat Evolved. A Windows Vista version of the game was released on May 17, 2007, developed by an internal team at Microsoft Game Studios referred to as "Hired Gun". The game features a new game engine, as well as using the Havok physics engine; added weapons and vehicles, and new multiplayer maps. The player alternatively assumes the roles of the human Master Chief and alien the Arbiter in a 26th century conflict between the human UNSC and genocidal Covenant. Players fight enemies on foot, or with a collection of alien and human vehicles.

After its initial release, Halo 2 was the most popular video game on Xbox Live, holding that rank until the release of Gears of War for the Xbox 360 nearly two years later. By June 20, 2006, more than 500 million games of Halo 2 had been played and more than 710 million hours have been spent playing it on Xbox Live; by May 9, 2007, this number had risen to more than five million unique players on Xbox Live. As of November 2008, Halo 2 is the best-selling first-generation Xbox game with 8.46 million copies sold worldwide, with at least 6.3 million copies sold in the US alone. Critical reception of the game was generally positive, with most publications lauding the strong multiplayer component; at the same time, the campaign was the focus of criticism for its cliffhanger ending.
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Halo 3 is a first-person shooter video game developed by Bungie exclusively for the Xbox 360. The game is the third title in the Halo series and concludes the story arc that began in Halo: Combat Evolved and continued in Halo 2. The game was released on September 25, 2007 in Australia, Brazil, India, New Zealand, North America, and Singapore September 26, 2007 in Europe; and September 27, 2007 in Japan. On the day before its official release, 4.2 million units of Halo 3 were in retail outlets.

Halo 3's story centers on the interstellar war between 26th century humanity, led by the United Nations Space Command, and a collection of alien races known as the Covenant. The player assumes the role of the Master Chief, a cybernetically enhanced supersoldier, as he wages war in defense of humanity, assisted by human Marines as well as an allied alien race called Elites, which is led by the Arbiter. The game features vehicles, weapons, and gameplay not present in previous titles of the series, as well as the addition of saved gameplay films, file sharing, and the Forge map editor; a utility which allows the player to perform modifications to multiplayer levels.

Halo 3 grossed US$300 million in its first week. More than one million people played Halo 3 on Xbox Live in the first twenty hours. As of January 3, 2008, Halo 3 has sold 8.1 million copies, and was the best-selling video game of 2007 in the U.S. Overall, the game was very well-received by critics, with the Forge and multiplayer offerings singled out as strong features. By March 2009 more than 1 billion online matches had been played. A prequel to the game, Halo 3: ODST, is currently under development.
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Halo Wars is a real-time strategy (RTS) video game developed by Ensemble Studios and published by Microsoft Game Studios for the Xbox 360 video game console. It was released in Japan and Australia on February 26, 2009, in PAL territories on February 27, and in North America on March 3. The game is set in the science fictional universe of the Halo series, 20 years before the events of Halo: Combat Evolved. The player leads human soldiers aboard the warship Spirit of Fire in a effort to stop an ancient fleet of ships from falling into the hands of the genocidal alien Covenant.

Halo Wars was officially unveiled at the X06 Xbox show in 2006. Ensemble designed the game specifically for the Xbox 360 controller, in an attempt to circumvent issues present in previous console RTS. Ensemble was closed by Microsoft before the game's release, but Robot Entertainment was quickly founded by many of Ensemble's former employees; this new company continued to support Halo Wars with updates and downloadable content.

Halo Wars received generally positive reviews. Reviewers lauded the game's pre-rendered cinematics, attention to detail in replicating the Halo universe, and intuitive control scheme. Complaints against the game included the lack of an option to play as Covenant or Flood factions in the campaign mode, and the lack of strategic options during play. Critics from GameSpot and USA Today wrote that experienced RTS players would find the strategic elements of the title shallow. The game sold one million units worldwide through March 2009, making it the best-selling console real-time strategy game to date.
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Halo 3: ODST (initially named Halo 3: Recon) is a standalone expansion for the first-person shooter video game Halo 3. Players assume the roles of human UNSC soldiers known as Orbital Drop Shock Troopers (ODSTs) during the events prior to Halo 3.

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Halo: Reach is an upcoming first-person shooter video game in development exclusively for the Xbox 360. The game is the sixth game in the Halo series. It is scheduled for release in Fall 2010.
[NOTICE] Please buy Halo 3 ODST to recieve a beta version halo reach multiplayer beta on September 22nd 2009