If a survivor falls off a ledge, then they may automatically hang onto it and can only be helped up by another survivor. 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. Although the survivors are carriers of the disease they do not show signs of any symptoms. They play through the levels fighting off the infected-living humans who have been infected with a rabies-like virus that causes psychosis. 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.

Left 4 Dead is a cooperative first-person shooter video game, developed by Valve South and published by Valve Corporation. Download Left 4 Dead for free on PC – this page will show you how to download and install the full version of Left 4 Dead on PC.

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