Halo 2 is a science fiction first-person shooter video game developed by Bungie. Released for the Xbox game console on November 9, 2004, the game is the sequel to Halo: Combat Evolved. 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 May 9, 2006, Halo 2 is the best-selling first-generation Xbox game with 8 million copies sold worldwide. As of September 25, 2007, Halo 2 is the fifth best-selling video game in the United States with 6.3 million copies sold in the US alone. The game features a new game engine, as well as using the Havok physics engine; added weapons and vehicles; new multi-player maps; and a continuation of the storyline from Halo: Combat Evolved. (more...)