Back 4 Blood is an "exceptional" zombie co-op zombie shooter, but its difficulty is a bit unbalanced. Some will strenuously deny it, but certain encounters in the game are dramatically tougher than those on either side, and that's not to mention the Corruption Cards that can bank up throughout a run, gradually turning a tense zombie blaster into a test of endurance...
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Back 4 Blood is too hard, and Turtle Rock is still finding the right balance
Source: PC Gamer (opens in a new tab)