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 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. 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. 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.
Testing was performed at 1920×1080 8aa 16af with 3D enabled.
The 3D experience provided by the 6850 in Left 4 Dead 2 is good and the software is free from bugs, provided we don’t alt-tab out to the desktop. Unfortunately it is one of only a few games which runs well in stereoscopic 3D on AMD hardware as the 3rd party drivers used to enable this technology still require a lot of development work, the complete opposite of the experience on NVIDIA based hardware.