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Mine is 23 so far . And 213 with the new glitch.
My best strategy is going to the power handle, open the door behind it and then go and camp up the stairs (with multiple people). You can go get the perks and go to the Pack-A-Punch machine (with the teleport nearby).
I just made 35 with 3 people legit last night no glitching! we used the fly trap area to camp in untill 31. then we opened up the MP40 door into the hallway and ran back n forth from teleporter to teleporter untill we died at level 35. It was titties! we just ran from the mainframe to the mp teleporter (turning on the electric fences along the way) teleporting when the zombies overtook us, then again from the mainframe to the thompson teleporter.
We started the round at 12:30 am and died at 4am.... 3.5 hrs for 35 rounds. Dam. lots of time invested.