Set in the immediate aftermath of the zombie apocalypse, Left 4 Dead's survival co-op mode lets up to four players blast a path through the swarming zombie hordes and terrifying mutant monsters. Guide your survivors across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests in your quest to escape a devastated Ground Zero crawling with infected enemies.
Amazing coop shooter, one of my favouritest games from Valve :) It's sad, that Valve had released L4D2 then and completely forgot about original game. Deep horroric atmosphere in first L4D is more pleasant for me...