This is State of Decay, a new Microsoft-published Xbox Live Arcade game that might be one of the most ambitious digital titles I've ever seen. It's an RPG, and also an RTS, and also a zombie survival game, and also a simulator, and if you're confused by all this, I know exactly how you feel. You can watch some video footage—and listen to me try to talk after destroying my voice at PAX East last weekend—right up top.