Back 4 Blood is a cooperative first-person shooter video game developed by Turtle Rock Studios. Released in October 2021, it serves as a spiritual successor to the popular Left 4 Dead series. Players team up in groups of four to battle against hordes of infected creatures in a post-apocalyptic world. The game features a card system that allows players to customize their abilities and strategies. With various characters, known as "Cleaners," each with unique skills, players can adapt their gameplay style. Back 4 Blood emphasizes teamwork and communication to survive challenging missions and defeat powerful bosses.