Left 4 Dead 2 is a cooperative <http://en.wikipedia.org/wiki/Cooperative_gameplay> first-person shooter <http://en.wikipedia.org/wiki/First-person_shooter> game. It is the sequel to Valve Corporation <http://en.wikipedia.org/wiki/Valve_Corporation>'s award-winning Left 4 Dead <http://en.wikipedia.org/wiki/Left_4_Dead>. The game launched on November 17, 2009, for Microsoft Windows <http://en.wikipedia.org/wiki/Microsoft_Windows> and Xbox 360 <http://en.wikipedia.org/wiki/Xbox_360> in the United States and November 20 in Europe; in 2010, Left 4 Dead 2 was made available to the Steam client for Mac OS X.[8] <http://en.wikipedia.org/wiki/Left_4_Dead_2> It builds upon the cooperatively-focused gameplay of the original and uses Valve's proprietary Source engine <http://en.wikipedia.org/wiki/Source_(game_engine)>, the same game engine used in Left 4 Dead. The game made its world premiere at E3 2009 <http://en.wikipedia.org/wiki/Electronic_Entertainment_Expo> with a trailer during the Microsoft <http://en.wikipedia.org/wiki/Microsoft> press event.[9] <http://en.wikipedia.org/wiki/Left_4_Dead_2>

Like the original <http://en.wikipedia.org/wiki/Left_4_Dead>, Left 4 Dead 2 is set during the aftermath of an apocalyptic <http://en.wikipedia.org/wiki/Zombie_apocalypse> pandemic <http://en.wikipedia.org/wiki/Pandemic>, and focuses on four survivors fighting against hordes of the infected. The survivors must fight their way through levels, interspersed with safe houses <http://en.wikipedia.org/wiki/Safe_house> that act as checkpoints <http://en.wikipedia.org/wiki/Saved_game>, with the goal of reaching a rescue vehicle at the campaign's finale. The gameplay is procedurally altered by an artificial intelligence <http://en.wikipedia.org/wiki/Artificial_intelligence> engine dubbed the "Director" that monitors the players' performance and adjust the scenario <http://en.wikipedia.org/wiki/Scenario> to provide a dynamic challenge. Several new features have been introduced: new types of infected, melee weapons <http://en.wikipedia.org/wiki/Melee_weapon>, and a story-arc that connects the game's five campaigns together.[10] <http://en.wikipedia.org/wiki/Left_4_Dead_2>

When it was announced, it received a combination of positive and negative critical and community reactions. It also attracted an unusually high volume of pre-release controversy about the game's graphic content. In response, alterations were made to the cover art[11] <http://en.wikipedia.org/wiki/Left_4_Dead_2> and both Australia (due to having no R18+ rating) and Germany refused to rate the unmodified edition.[12] <http://en.wikipedia.org/wiki/Left_4_Dead_2>

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