It became one of the best-selling titles of 2008, selling 3 million copies in the United States within the first two months of its release. It also marked the beginning of the Black Ops sub-series, as characters from World at War were carried over into its sequel, Call of Duty: Black Ops (2010).
Black Ops II is the ninth game in the Call of Duty franchise of video games, a sequel to the 2010 game Call of Duty: Black Ops and the first Call of Duty game for the Wii U.