lvl 29 with 2 people. upgraded mg-42, browning, ray gun, and ppsh. ran circle stategy which is legit. Start at bowie knife teleport and stay there until it gets out of hand then teleport. go to the left where the trench room is and wait for zombies to come and then turn on barrie. go up the stairs and jump down and turn on bridge barrier when zombies come. then keep repeating.