Turtle Rock Studios, the development team behind co-op zombie shooter Left 4 Dead, today announced they’re developing a new game in partnership with Warner Bros. The game is — hold onto your butts — a co-op zombie shooter called Back 4 Blood. Back 4 Blood? More like Back 4 More, am I right? Neither company has released much info about the game thus far, save that it’ll be a “premium” title with both a campaign and PvP gameplay in which you’ll be able to “shoot up a lot of zombies.” Turtle Rock is adamant this isn’t Left 4 Dead 3, but team members have…

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