If you ever restart (try this) ok well me n my friends were doing this and we found out if you keep restarting over and over again until you noticed that no zombies come from that windo you do the glitch on you all can go down (have crawlers) and get any weapon you want but when you turn on the power the window begins to have zombies spawn there....We got to round 20 without other weapons (3 of us and the olympia and mpl and m14 and pistols lol) I also found a way to get 3 guns without the minigun...I'll post it as soon as I can