(adsbygoogle = window.adsbygoogle || []).push({}); The Ally:
When you are looking at the PaP machine open the door to the left and work your way around to the inside of the other door and this is what you do...

3 people look down the ally and the other person covers the window. The window man is the most important man in this strategy. In later round there may need to be 2 covering the ally and 2 covering the window. Never open the the door to the left when you are looking down the ally!

The Balcony:
At PaP machine get to where the first box is by opening either door, it does not matter how you get there. The balcony is behind the door you have to open when you are facing the bridge it will be behind you. Open the door and climb the stars and here is what you do...

Climb the stars and 1 person covers the window and the rest can cover the stairs, the incoming zombies or whatever. Never get in the hole where the box is, that is where you will die.

The Quick Revive Room:
You get here the same way you would get to the balcony but instead of going to the stars you make a left before the room that has the steps in it and the is a Quick Revive machine. Here is what you do...

One person will stand at the window holding square and shooting either the zombies trying to break the window he is constantly repairs or shoot the zombies coming in the entrance of the room. The other 3 players will kill the zombies coming into the entrance. If you are looking at the entrance there is a hole to the right so be careful not to fall in it if you do this. If you feel you may die simply fall into the hole and do not leave, if you do fall in the hole your team mates should follow to help you hold them off until the next round.

I like to switch it up a bit...sometimes I camp at the carbine(got me to 32). Sometimes I have 2 people cover the entrance of Teleporter C and 2 at windows. Sometimes I just wonder around wit a bowie knife up to round 20 or so...

I don't have that trophy but is it that beast? I may try that next time. Does it kill the with one stab?

until roun 12

we just run from teleporter to teleporter turning on barriers

Its 1 stab until round 12
But after that I switch to Thompson, put enough bullets for their arm to pop off, and then knife for the kill. Saves ammo and less box time for me. Just risky for crowds of zombies so I just kill a few normally and then kill the last 3 with the knife. I also recommend juggernaut.

For the achievement, if you can't do it with 4 player then get a good friend to play 2 player with you. Both buy the knife right away(if your just going for achievement) and just have a slaughter with it. Works good cause once you get to 12 you can just take turns or compete for the kills.

I just got the trophy, I went down 12 times trying though. We went on the balcony and I had the window so I just knifed in the window until I got it. The next one I am going for is Pack Addict!

tru dat lol its also good for getting out of map before round 12

Sit in the teleporter then teleport when there are to many.

alley for me