Left 4 Dead is a cooperative first-person shooter video game, developed by Valve South and published by Valve Corporation. In the game the player takes control of one of four survivors; if human players are not available, then the remaining survivors are AI-controlled bots. They play through the levels fighting off the infected—living humans who have been infected with a rabies-like virus that causes psychosis. Although the survivors are carriers of the disease they do not show signs of any symptoms. The game focuses on cooperation and teamwork and thus eschews some “realism” conventions usual in most FPS games of the wider genre; colored outlines of teammates are visible through walls to help players stick together and coordinate their movement. If a survivor falls off a ledge, then they may automatically hang onto it and can only be helped up by another survivor. If a survivor’s health is depleted, then they become incapacitated and can only be revived by another survivor, at which point they continue playing with a low amount of health that decreases over time.

Left 4 Dead System Requirements

Minimum:

• OS: Windows® 7 32/64-bit / Vista 32/64 / XP
• Processor: Pentium 4 3.0GHz
• Memory: 1 GB
• Graphics: 128 MB, Shader model 2.0, ATI 9600, NVidia 6600 or better
• Storage: At least 7.5 GB of free space

Recommended:

• OS: Windows® 7 32/64-bit / Vista 32/64 / XP
• Processor: Intel core 2 duo 2.4GHz
• Memory: 1 GB
• Graphics: Shader model 3.0, NVidia 7600, ATI X1600 or better
• Storage: 8 GB