'Back 4 Blood': Release Date, Trailer, Gameplay, and Everything We Know So Far "Left 4 Dead" series (1 and 2) were once one of the best, genre-defining survival horror games our consoles have ever seen. This time, Turtle Rock, also previously known as Valve South, is gearing up for its spiritual sequel, "Back 4 Blood." Following the devs' announcement during The Game Awards 2020, where "The Last of Us Part 2" took home almost all the major trophies, fans finally get more news on the legendary co-op zombie survival title. Many have noticed an exact rip-off between L4D and B4B, while most appreciate how the devs take things to the next level by adding more complex elements.