This video shows a really simple glitch that some of my friends and I discovered. Using this glitch, you can essentially get an infinite amount of time on the No Mercy rooftop finale in survival mode.

The idea is the following: you stand behind the air conditioning unit (I guess that's what it is) on the roof. This somehow breaks the space-time continuum, and zombies (including special infected and tanks) can no longer pathfind correctly. No zombies can hurt you!

This works best when there's only 1 person alive which is why I killed the bots off in the beginning.

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