Turtle Rock's Back 4 Blood is a more complex Left 4 Dead spiritual

Original Left 4 Dead developer Turtle Rock evolves the zombie shooter with Back 4 Blood, a four-player co-op action game that includes player progression, perk cards, and new strains of zombies.

Left 4 Dead Creators Reveal Concept Art for New Zombie Game, Back 4 Blood - IGN

Back 4 Blood Tips and Tricks Guide - Epic Games Store

Back 4 Blood Review

Back 4 Blood – News, Reviews, Videos, and More

Turtle Rock Studios Announce Back 4 Blood - IGN

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

Forget Left 4 Dead, Back 4 Blood sequel teased by Turtle Rock

Back 4 Blood Will Not Have Left 4 Dead's Versus Campaign and That Sucks

Back 4 Blood Review: Army of the Dead