^ I play the same level occasionally. I've gotten to 24, with 4 people, totally different strategy though. We run "the loop" which is basically a huge circle through the whole map killing off any zombies in the way and activating the teleporter as we run and then jumping it, raining grenades and coming back. It works well, me and my buddies haven't gotten past 24 because it takes too damn long doing it this way and just get hungry/tired/got to pee/bored of repetition/etc after like 2-3 hours of running the same damn loop.
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