When Valve announced Left 4 Dead 2 during Microsoft's E3 2009 press conference -- less than seven months after the release of the award-winning original -- gamers were, perhaps rightfully, shocked. This was the same Valve that spent nearly ten years iterating on Team Fortress 2 and whose experiment in episodic gaming has forced us to reevaluate our expectations for future installments of Half-Life 2 using the "Star Wars-definition" of episodic. So when Valve announced a direct sequel to the ground-breaking Left 4 Dead on what could only be considered an accelerated schedule for normal developers (and an impossibly accelerated schedule for Valve) we had every right to be shocked. Valve answered this concern with assurances that Left 4 Dead 2 was an entirely new game, with changes that could not be simply grafted onto the original. And the team was right! ... But that's the problem.