"Left 4 Dead certainly lives true to the term survival horror. This isn't about defeating the zombie hordes and heroically saving the world. This is simply about not dying for as long as you can, and maybe, if you're lucky, escaping. Being described as a procedural experience, rather than a series of scripted routines, this is the brainchild of one Michael Booth, the creator of online multiplayer Counter-Strike's official AI bot. This is a man who knows how to programme convincing and effective artificial intelligence, and just the sort of person equipped to give brains (braaaaiiins) to those who would take brains (brrraaaaaiiiiiins): an army of the deadliest undead. It's a game designed to respond to the reactions of human players, and improvise accordingly. It's a game that should already be starting to scare you."