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Not sure if this was patched but in the pig room u got 2 windows 1 behind the claymores and one next to the cages where the pigs should be in..
when u repair bottem and top bar u can jump on it and then when ure on the top 1 u can jump 1 barrier more above. wich will lead u to the frame of the window.. When the zombie break the window u WONT fall off and all zombies will go for you and wont be able to hit u..
tought it was old and patched, so nthats why i posted it that i works