Call of Duty: Modern Warfare 3 is the 2011 release in the best-selling Call of Duty First-Person Shooter action series. The game is a direct sequel to the previous game in the series, Call of Duty: Modern Warfare 2, with a campaign storyline continuing the struggle of U.S. forces against an invasion by the Russian Federation following the framing of an undercover U.S. agent in a terrorist attack on Moscow. Along with classic Call of Duty multi-character control, Call of Duty: Modern Warfare 3 contains deep multiplayer support, including two-player Co-op Survival mode. The game also contains all-new Kill Streak categories and customizable strike packages that offer more options for player combat styles and strategies.