Forklift Glitch
On the the level with the elevator in the No Mercy campaign. 1 person should go do this while the others keep the survivors distracted. Get to where the top of the elevator is, and keep going according to the path until you see a forklift. This glitch is a great backup if for some reason your glitch to block-off the elevator door didn't work out well. Simply move the forklift to the left, followed by pushing it forward till it is placed perfectly between the boxes and the support column of the building. IF done right, they should not be able to continue from this point.
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