Turtle Rock's last unfinished Left 4 Dead campaign is now available to play : r/Games

The Last Guardian

Back 4 Blood won't get new content as its developers focus on making next game : r/gamernews

Left 4 Dead and Left 4 Dead 2 are 13 and 12 years old respectively, and still are one of the best co-op zombie shooters out there. Shame Valve don't know how

Back 4 Blood is the Left 4 Dead 3 We've Been Waiting For - Easy Allies : r/ Games

Turtle Rock Studios Announce Back 4 Blood - IGN

Home Brandon Sanderson

Turtle Rock Studios Survivors Improved (Mod) for Left 4 Dead 2

Left 4 Dead's developer just released a final, unfinished campaign

Idea For Evolve Pre-Dates Left 4 Dead, Turtle Rock Not Planning a Return For Left 4 Dead 3