Left 4 Dead

Left 4 Dead (abbreviated L4D) is a cooperative first-person shooter video game. It is set in a zombie apocalypse. The zombies are humans who got an unknown infection. It is available for Xbox 360 and PC.

Concept and Characters
Left 4 Dead is a shooting game located in a zombie apocalypse. In-game there are several references from zombie movies or shows. The game has four playable humans or Artificial Intelligence controlled survivors; called Bill, Louis, Francis and Zoey, that battle against hordes of infected humans, or zombies, that can be controlled either by AI (artificial intelligence) or by other players (online or not). The first goal of the game is to help each other through a level to safety. Infected players must cooperate to stop them.

The Cover
The cover of the game, according to Valve, represents the title of the game, due to the hand being the "left" hand while only having "4" fingers while also being "dead," making up the title: Left 4 Dead.

Levels
There are five levels or "campaigns". Each of the 5 campaigns has the player(s) follow a generic path of going from point A to point B with a few different routes and awards stating who took the least damage, etc. There is a downloadable campaign which is called "Crash Course".

Sequel
Left 4 Dead 2 is Left 4 Dead's sequel. There are 4 different characters, more weapons, new infected and different gameplays.