Left 4 Dead

Left 4 Dead is a cooperative survival-horror first-person shooter video game. It was developed by Turtle Rock Studios, which was purchased by Valve Corporation. Set during the aftermath of an apocalyptic pandemic, the game pits its four protagonists - dubbed the "Survivors" - against hordes of the infected. The popularity of the game led to the development of a sequel, Left 4 Dead 2, which was released November 17, 2009.