I lasted until wave 23 with 4 people doing this...
Open up the help door ASAP so you can get good weapons. When we did it we all had ray guns and brownings.
Clear the debri in the help room and have everybody camp where the grenades can be bought on the 2nd floor.
Have 3 people watch the door with brownings and 1 person with ray gun, while the other person is guarding the window in prone with a ray gun.
It stinks to be the guy watching the window because at points the zombies are inches away from you:P
Also if somebody needs to reload just swap positions, you'll have more than enough guys to look after the door.
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