Lead writer Chet Faliszek confirmed in an interview that the Left 4 Dead series had sold over 11 million units in total as of August 2011. Left 4 Dead 2 was both critically and commercially successful critics praised the additions of melee weapons and new enemy types coupled with the original game's emphasis on cooperative tactics and horror-themed gameplay. Director' to procedurally alter gameplay to an even greater degree, customizing the dynamic difficulty of each scenario based on players' performance. While still retaining the same focus on four-player co-op as in the original game, Left 4 Dead 2 uses an updated version of the ' A.I.

The sequel is set in the Southern United States and centers around a new team of four Survivors - Coach, Nick, Ellis and Rochelle - who are forced to work together to fight through the hordes of Infected and reach safe haven.

Like its 2008 predecessor, the game is set during the aftermath of a global pandemic that rapidly transforms its victims into mindless, highly aggressive zombie-like creatures known simply as 'the Infected'. Left 4 Dead 2 is a first-person shooter developed and published by Valve for PC and Xbox 360 on November 17, 2009.

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