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.
A sound pack I made changing most of the Smoker sounds to the gun turrets in Portal. There is a video of this on youtube. Just search for l4d turret or find me, nsf4848. Hope you enjoy it!