Turtle Rock Studios, the development studio that created Left 4 Dead and who eventually brought us Left 4 Dead 2 and Evolve (but let's not talk about that one) is working on a new co-op FPS. And just like Left 4 Dead, this new title will also include plenty of zombies.

The game is called Back 4 Blood (I see what they did there) and it will be published by WBIE. It's a bit early to say how this one will turn out since a lot of the old Turtle Rock kind of merged with Valve for a while there. We'll obviously be keeping our eyes on this one though.

Turtle Rock has...