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I know that a lot of people have posted strategies that are almost exactly the same, but I have tweaked it and created a more in depth description. Enjoy, thank, and +Rep if you find this useful
For the first 2 rounds, use only your knife, and let them in, trying for 2x or Ka-Boom. Round 3, shoot the zombies 8 times and then knife them, trying to keep them outside (If you're comfortable letting them in however, go for it). At the end of the third round, you should have at least 2200 points, probably more. Open the stairs and go buy a Thompson. If you still have 1000points, buy Bouncing Betties and place them in the corner by the Storage door, by the Trench Gun. This is where you camp for dogs. Stand in front of the window, checking to make sure it isn't being broken down occasionally, and get headshots with the Thompson. In between rounds, start opening doors to find Juggernog and Speed Cola (avoid opening Storage unless it guranteed has Juggernog or Speed Cola). Maybe go to Mystery Box a few times, but don't go too much until the door to Comm Room swamp is open and you have at least Juggernog.
At round 8 or so, wait for the gong thing that signals the beginning of a round, place your betties, and run to the Comm Room swamp. Go around the right side. The path ends, so you must sprint and jump to the fence on your right if you don't want to be slowed down. There should be a small hut in front of you. Run around or the hut and continue following the path, not going into Comm Room. There will be another hut in front of you. Turn left inside there. This is the most dangerous part of this strategy. In early rounds, just shoot the zombies coming at you. In later rounds, you need Juggernog for this, just find a hole and sprint through it. Repeat that same thing at least twice, and when you go through the second hut (the dangerous one), turn around and shoot all the zombies following you. Do this a few times until they are all dead, but you might want to make one a crawler if you don't have the Wunderwaffe yet. Go Mystery Box until you have a Thompson and a Waffe, and place your betties by the Trench Gun for dogs.
The zombies all spawn at once when you are playing solo, so this could get you past 100 easy. However, it isn't flawless. About 1 in 10 times you do this you will get past level 30, so there is a lot of luck involved.
My 360 Gamertag is yyz13, feel free to add me if you want to play zombies.