Call of Duty: Black Ops received an 18+ age rating due to its violent and criminal content, including killing zombies, war scenes, and strong language. The game was designed for those 18 and older as it allows players to enjoy a virtual life of crime and violence without real consequences. In its first day on sale in 2010, Black Ops sold over 5.6 million copies and made $360 million in revenue. Both positive and negative feedback was received, with praise for its realistic graphics but criticism of the excessive bad language that could still be heard by younger players.