The Closed Alpha for Turtle Rock's first-person cooperative zombie shooter Back 4 Blood is now live until December 21st. On this occasion, Warner Bros. and the developer share new details on the title's vision as well as new gameplay footage. Players control "Cleaners" who gathered to deal with the Ridden, the name given to infected people due to an outbreak by the parasitic Devil Worm that killed or infected most of humanity. The game is planned to launch June 22nd 2021.