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First off, you need at least two people for this glitch. As soon as you get enough points open downstairs, then the comm room gate, then doctors quarters gate then comm room hut. Ok so what you do is after all of that is open, have one person go kill themselves outside to the left of the doctors quarters hut and then when he spawns the next round, everyone go to the comm room and have the person that killed themselves run jump and crouch in front of the perk machine and if done right, all the zombies outside should just come by the door and then go straight to doctors quarters

all you need to do is have someone guard the windows inside the hut.

^