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.
Gabe Newell talks about the making of Left 4 Dead along with an extended E3 trailer. This presentation was originally made at E3 2008 for members of the press and E3 awards judges, and contains portions not previously available to us common folk.
Gabe goes into detail on many aspects of the making of Left 4 Dead, including their goals in development, the what and why of the AI Director, all about the monsters including animation, physics and AI, and also all about the world including graphics and lighting technology. The video can be found below, just make sure you press the fullscreen button to get the full resolution.