l4d2 | Left 4 Dead 2 Trailer Released

<p>"A large part of how Left 4 Dead became 2008’s top-selling new IP on Xbox 360 and the PC was the custom-tailored gameplay made possible by the AI Director," said Gabe Newell, president and co-founder of Valve. With the knowledge gained from creating the original, new technology.&nbsp; Source Link :- http://ready2beat.com/entertainment/games/left-4-dead-2-l4d2-trailer</p&gt;