If you tried playing Counter strike it's easier for you to control your character because they are using Counter Strike control engine since they are owned by the same company, but it's a lot different because you're killing Zombies here. In Counter Strike, you need to kill other team to win the game. But in Left 4 dead you need to work as a group to complete your mission and survive. There are Four Characters in the game; Francis a tattooed covered biker, Zoey A college student and horror movie enthusiast, Louis a Junior Systems Analyst in his company's IT department; and Bill a Former Green Beret and Vietnam Veteran. They're up against a fast-moving horde of zombies, like those seen in 28 days later and the remade Dawn of the Dead though without either movie's fast-acting, hero-killing virus. While infection isn't a concern, the heroes do have to deal with a host of specialized zombies. Boomers are swollen with bile, which they spew at victims to blind them and attract other zombies. Hunters pounce from the shadows, knocking down survivors and then clawing open their chests. Smokers lurk on roofs and in dark alleys so they can attack and then strangle survivors with their super-long tongues. Witches are solitary zombies that sob uncontrollably and lash out at anyone who disturbs their sorrow. Opposite the witches are the tanks, brutish berzerkers that flip cars, throw chunks of concrete and pummel enemies into bloody bits.The game is focused on cooperation and team play; 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. The game is experienced through four campaigns that take place in various urban and rural locales. You need to work together and that's the one thing that i learned while playing this game. i really had fun, i keep on controling my self not to shout but the hell of those Zombies who suddenly appear in front of my monitor! Damn! it scared the hell of me.. ha ha ha.. it's one of my latest addiction right now.