Left 4 Dead 2

Left 4 Dead 2 is a cooperative first-person shooter video game, the sequel to Turtle Rock Studios' 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. On September 5, 2010 the game was made available to the Steam client for Mac OS X, and on July 2, 2013 it was made available through Steam for Linux.