Back 4 Blood is a cooperative first-person shooter set in a post-apocalyptic world overrun by the Ridden, a terrifying infected horde. Players form squads of four to complete mission-based campaigns, using a card-driven system that randomizes enemy types, objectives, and loot for high replayability. The game emphasizes teamwork, strategic use of weapons and abilities, and intense close-quarters combat, while offering both PvE and PvP modes. Developed by Turtle Rock Studios and published by Warner Bros. Interactive Entertainment, it launched on October 12, 2021 for Xbox Series X/S, PlayStation 5, Xbox One, PS4, and PC.