(adsbygoogle = window.adsbygoogle || []).push({}); i have done this with NGU User CamelToe
once you spawn you go and get enough to buy downstairs and after you have enough points then go and purchase downstairs not to the left i dont know why but is seems to work worse if you purchase to left of where you spawn so just buy down stairs once downstairs there should the chest with the random guns once the hell hounds come make sure some one has a shot gun preferably the double barrel and once the the hell hounds come then go to the hallway behind teh box then once you get the teddy hope for to get it where the zipline is or the door is called "The doctors office" once ther just camp ther have 2 people with rayguns or browning and one person at the window in the main room then have somebody camp the windows in the little room next to the box when the hell hounds come camp the little room next to the box and if your too crowded with zombies then take the zipline!
i go to wave 27 but every body lagged out

Nice strategy, what I do is have all the people on the bridge, then have 2 facing one way and me and another guy facing the other way. I've got to round 17 doing this which is okay I guess

yea we use the same type, still perfecting it though, got to lvl 23, but my team got downed, but i managed to revive them but once i was downed it all went to pieces