This happens because your in a glitch and the zombies get use to not attacking you. Each round less zombies will come and just stand at the window, until you get to a high round where they would just stop coming in. This is what i learnt:
1 person - zombies will still come in no matter what level
2 people - zombies will stop coming at level 45 aprox.
3 people - zombies will stop coming at level 37 aprox.
4 people - zombies will stop coming at level 30 aprox.

^ at least one person must be in a glitch

so the more glitchs being done the better chance that the zombies will stom comming in?

I dont know i never tried, but it might work

Lol. What do you mean this might work it does work silly

What i always do is open all doors on right.including door that is at end of power room and i open stairs on left.I then go upstairs on left.1 guy goes in glitch and 1 guy behind.1 guy at window behind and last guy to check on everyone.i open the door after power room so if we get teddy bear on weapon box it can spawn under the window so we aint risking it around the map.ofcourse after level 30 about they come in only at window.thats why every1 needs a ray gun cos they turn into robot zombies.i only got to level 38 with 3 guys because guy in glitch left and we died but if we all lived we could have gotten further.i hope this helps guys.GT=DJ Crolly

Yeah thats a good stratigy

ill try that stuff tonight! youtube bin laden sings calum kennedy very funny! cheers guys

i was doing what j crolly was doing except with only 3 people so it was a lot harder.
gamertag.....the BeeEyeGee

yep it happens ent it kool!

This is a normal occurance and has been discussed to death in several other threads.


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Groovy