

There also have been concerns about the game's graphic content, as seen from the alterations made to the cover art as well as the refusal of classification by the Australian Office of Film and Literature Classification for the unmodified edition. The game attracted an unusually high volume of pre-release controversy,receiving a combination of positive, negative, critical, and community reactions. Several new features have been introduced, such as new types of infected, melee weapons, and a story-arc that connects each of the game's five campaigns together.

The gameplay is procedurally altered by an artificial intelligence engine dubbed the "Director" that monitors the players' performance and alters the scenario to provide a dynamic challenge for the players as they progress. 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. The game made its world premiere at E3 2009 with a trailer during the Microsoft press event. 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.
LEFT 4 DEAD 2 STEAM WONT START WINDOWS
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.
