Back 4 Blood, Turtle Rock's latest addition to the co-op zombie shooter genre, gives a fresh take on everything players have enjoyed about Valve's Left 4 Dead series for the last decade. It's got weird zombies (okay they're called "The Ridden"), gonzo objectives, great gunplay, and an AI "director" that is deliberately out to ruin your day (or give you some health packs--as a treat).
But there's one huge mechanic that wasn't in the Left 4 Dead games that has helped make Back 4 Blood an incredible
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