Alongside the likes of Half-Life and Portal, Left 4 Dead is considered one of Valve's crowning achievements. director, which adjusted the challenge during play to keep things interesting. The gameplay is also regulated by Left 4 Dead's A.I. The game was designed to encourage players to work together since teamwork and coordination was key to surviving. The first Left 4 Dead is a cooperative shooter from Value, where up to four players fight off hordes of zombies and other creatures. Left 4 Dead 2's Realism mode is for players who really want to test their skills.
