Left 4 Dead 2 or L4D2 is a first-person cooperative shooter game first released in 2009. It continues the story of Left 4 Dead. The game is set a week after the first game. The Infection or The Green Flu, an unknown virus that turns humans into zombies, has spread through the southern part of the US. There are four survivors in the game:
• Nick – a gambler who goes from city to city to find back-alley card games
• Rochelle – an associate producer from a popular news station
• Coach – a former defensive lineman turned teacher in a high school
• Ellis – a mechanic who works at a local garage in Savannah
Left 4 Dead 2 has two game modes: Realism and Scavenge. Scavenge mode is a turn-based match wherein the survivors have to look for gas cans to fuel a vehicle or a generator. Players must fight against others and look for the gas cans in a limited amount of time. In Realism Mode, players have the option to choose the difficulty of the game. This game mode alters the game play, such as the damage, and the use of weapons. The game has five expansive campaigns for the different game modes.