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

Back 4 Blood from Turtle Rock Is Vying to Reclaim the Left 4 Dead Throne - Hands-On

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

Day of the Dragon, Page 18

Left 4 Dead: Turtle Rock's final, unfinished campaign now available for free

Those who think B4B was a flop are the same players that buy 4 armor instead of contributing 400 to team upgrades : r/Back4Blood

Left 4 Dead's original developer releases final, unfinished campaign - Polygon

Lord of the Clans, Page 10

Left 4 Dead's final campaign released by Turtle Rock

Steam Workshop::My Cool Collection Of Left 4 Dead 2 Mods

Turtle Rock Studios releases the final, lost episode of Left 4 Dead – Destructoid