The game has five campaigns, playable co-operatively by up to four people, as well as in Versus and Survival modes; we’ve been told there’s a new game mode, too, but you’ll have to play it to find what it is. The appeal of the decision to deny classification to the unedited version of the game was conducted by the independent Classification Review Board, and resulted in the previous ruling to deny classification being sustained. They mention that it is an amazing game, definitely good entertainment, and has excellent game play. The first improvement you notice is that the graphics are much more detailed and considerably crisper – attention to detail which instantly makes Left4Dead 2 even more involving than its predecessor.

The Classification Review Board cited "insufficient delineation between the depiction of zombie characters and the human figures" as one of the key factors in its classification refusal. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The bile attracts a horde of Common Infected on contact with Survivors and also momentarily blinds them. With new mutant types as well this is the perfect mix of survival horror and all out first person shooter action. Set during the aftermath of an apocalyptic pandemic, the game focuses on four new Survivors, fighting against hordes of zombies known as the Infected, who develop severe psychosis and act extremely aggressive.With the kit, players have found ways to include the original Left 4 Dead campaigns into Left 4 Dead 2. In introducing the new Infected, the development team had to consider how the new abilities would mesh with the existing Infected and any changes they had made to them. In Left 4 Dead 2, the Director has been improved to encourage more participation by players, forcing players through difficult gauntlets to reach safety.

In a video interview posted on October 29, 2009, Gabe Newell said, "for people who joined the Boycott Group on Steam . Singleplayer mode allows players to play without intrusion from human players, working through the Campaign stages with three computer-controlled Survivor allies.Prior to release, it received mixed critical and community reactions, and attracted an unusually high volume of controversy about its graphic content. According to the NPD Group, the Xbox 360 version was the fifth best-selling retail title for consoles in November 2009, with over 744,000 copies sold.