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This is a guide to get as far a Level 33, because this is as far as we could get with 1 attempt.
This guide is for 2 people, can be done with more, but it worked with only 2.
First you need to spawn on the kar98 side(left side), gather as many points as you can, enough till you can get to the power room, also make sure you have enough for an MP40, as the gun is very good for points. Once you have enough move straight to the power room and turn the power on. Now, go and buy some betties and return to the power room and plant the betties around the stairs, so the zombies are covered. now go outside the room and have your friend defend the window to the right, and you defend the space on the left with your MP40, you should be able to last until Level 10, providing you do headshots with your MP40.
Before you get to level 10 keep trying to get a raygun and a browning.
Once you have both the guns head down to get juggernog then return back to the position, and hold the area off until there is only 1 zombie left, use this as an advantage for more time

, now go and buy slight of hand, then head down to get quick revive.
Once you buy quick revive open the door next to it, and head down to where there is a door next to the stairs, and begin to camp at the door. DO NOT OPEN THE STAIRS NEAR THE DOOR.
Begin to place betties behind you, this is a good use as if the zombies over power you the betties will do there job, at least spare you enough time.
Now kill the last zombie, now you need to position yourself, have your friend in front of you crouching, and you behind him standing.
Providing you both have MG42/Browning and slight of hand, you can use those guns in the same position till about round 29, aim for headshots and if you see any instakills best to switch to raygun as you can run faster.
(All zombies will come in 1's or 2's so easy to pick off)
By round 24 you will loose most of your MG42/Browning, so what we did is we kept 1 zombie alive and kept re-buying the magic box until we have full ammo/new mg42, we do this because we rarely got any max ammo crates.
Ok So once you get to about round 30, you browning/mg42 is completely useless, so best to pull out the raygun, you could do it where one of you is using browning and the other uses raygun, but we didnt want to risk them getting too close.
By Round 33 we had 20 shots in raygun and NO browning, so we died on round 33.
Remember to keep placing betties every round, as they will come in handy.
You dont have to wait till you have all the perks you could go straight to that position asap.
Always have a full clip of raygun on standby.
For 4 people you could just have 2 people on front (crouching) and two at the back

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I will be posting a new tutorial designed for 4 people ONLY.