The survivors must fight their way through levels, interspersed with safe houses that act as checkpoints, with the goal of reaching a rescue vehicle at the campaign's finale. Like the original, Left 4 Dead 2 is set during the aftermath of an apocalyptic pandemic, and focuses on four survivors fighting against hordes of the infected. It builds upon the cooperatively focused gameplay of the original and uses Valve's proprietary Source engine, the same game engine used in Left 4 Dead. The game launched on November 17, 2009, for Microsoft Windows and Xbox 360 in the United States and November 20 in Europe. It is the sequel to Valve Corporation's award-winning Left 4 Dead.
Left 4 Dead 2 is a cooperative first-person shooter game.
