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 - Wikipedia

Do you think in the future we will get people liking back 4 blood and calling it underrated or did the Left 4 Dead fans ruin any chance of that happening? : r/Back4Blood

Back 4 Blood review – a zombie-shooter tribute act with brains of its own, Games

Back 4 Blood review – the zombie trend isn't dead

Gamers Can't Get Enough Of Left 4 Dead Spiritual Successor, Back 4 Blood

Turtle Rock Studios update: no more additional content for Back 4 Blood, studio is working on next big game : r/Games

Turtle Rock Studios Announce Back 4 Blood - IGN

Back4Blood Preview: The Good, The Bad, and The Ugly

Back4Blood Preview: The Good, The Bad, and The Ugly

Everything In Back 4 Blood's New Children Of The Worm Expansion

Back 4 Blood Tips and Tricks Guide - Epic Games Store