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 Spiritual Sequel Back 4 Blood Gives First Gameplay Look

Turtle Rock Studios Announce Left 4 Dead Spiritual Successor, Back 4 Blood

Back 4 Blood Final Expansion Review: River of Blood - Magnetic Magazine

Back 4 Blood, Left 4 Dead's new spiritual successor

Left 4 Dead 3 - News and what we'd love to see

Left 4 Dead's developers are Back 4 Blood with new spiritual successor

Left 4 Dead successor Back 4 Blood left to rot as devs stop support - Dexerto

Turtle Rock Studios Announce Back 4 Blood - IGN

Turtle Rock Studios are working on a Back for Blood sequel - Xfire