Left 4 Dead 2

Left 4 Dead 2 is a cooperative first-person shooter video game, the sequel to Turtle Rock Studios's Left 4 Dead. The gameplay is procedurally altered by the "AI Director 2.0", which monitors the players' performance and adjusts the scenario to provide a dynamic challenge. It attracted an unusually high volume of pre-release controversy about the game's graphic content. As in the first game, each campaign is presented in menus and loading screens as a film starring the four Survivors; and features, upon completing a campaign, a faux credits screen which acts as the final scoreboard for the players and recaps certain performance statistics for the group. Players also carry a flashlight with infinite battery life, the use of which enables players to see in the dark . The Survivors are also susceptible to friendly fire, forcing players to exercise caution when shooting or swinging their weapons. As Survivors take damage, they move more slowly; if a Survivor's health drops to zero, they are incapacitated and left to fight off the Infected using a handgun until rescued by another Survivor.