It is easy to draw parallels between Left 4 Dead and Payday: The heist. So easy in fact that Valve and Overkill, the developer behind Payday, are making a proper crossover. Just recently a gameplay trailer was released showing the Payday clowns in a familiar hospital. There are hints and teases about the impending zombie outbreak sprinkled in the trailer. The most obvious being the quarantined patients you get a good look at. It is still not obvious what Payday has to do...
