If youre wondering why Back 4 Blood looks very similar to the ever-popular Left 4 Dead, its because both co-op shooters come from the same developer Turtle Rock Studios. Back 4 Blood is as close to a direct sequel as you can really get, the direct lineage to those original games helping it to stand out from a crowd that has sought to adapt that formula.
Source: N4G PC Back 4 Blood Open Beta Is it worth playing this weekend?