Editions: 7 Halo: Combat Evolved (2001), Halo 2 (2004), Halo 3 (2007), Halo Wars (2009), Halo 3: ODST (2009), Halo: Reach (2010)

Publisher: Microsoft Studios

Although it wasn't a phenomenal hit when it first came out, Halo grew into one of the biggest franchises is the history of gaming. Master Chief and his crew of elite marines plasma blasted their way into the front position of the FPS revolution. Unlike many of the shooters before it, the Halo series spun off novels, animated shorts, and branded merchandise. The game also penetrated became a pop culture staple, making it the mainstream definition of what a first person shooter is. So much that the latest release, Halo 4 is in as much anticipation as a Jay-Z and Beyonce collaboration album.