Call of Duty: Modern Warfare 3 is the best-selling first-person action game in the Call of Duty series released in 2011. 
The game is a direct sequel to the previous installment in the series, Call of Duty: Modern Warfare 2, with a campaign storyline that continues American forces' fight against an invasion of the Russian Federation after the arrest of an American agent infiltrated a terrorist attack in Moscow. 
In addition to classic Call of Duty multi-character control, Call of Duty: Modern Warfare 3 features deep multiplayer support, including a two-player Co-op Survival mode. 
The game also contains all-new Kill Streak categories and customizable attack packs that provide more options for players' fighting styles and strategies.