We use this to get to 30 or so every time we play, so I wanted to share what works for us and hopefully you guys can use it, or pieces of it to help you. We just found out that you can hack perk drops into max ammos for 5000 pts so we are aiming for 40+ with this strategy some other time. Building points with this strategy is easy, but we were spending way too much time hitting the box for more ammo before we figured out the dropped perk hack.
Before you even start, make sure Speed Cola is the first machine so you can buy Jug when you teleport back. Start out by knifing all zombies during 1 knife kills in no man's land, then get rid of grenades and teleport. No grenades in space spawn area to keep it from decompressing. You need this room, preferably the lab and tunnel 11 pressurized to give your self the best chance of going far. Go through tunnel 6 at round 2-3 , stay in the MPL room, get MPL and enough points between 4 people you can open up to the labs. It is extremely important to maximize your points these first few rounds, so empty your pistol and knife window zombies, and only MPL if you have too. Keep the red astronaut alive from the beginning and have one person deal with him in the main spawn area during these first few rounds. Once in labs, hack all doors to the rest of the map which are to the dome, teleporter, and tunnel 11. You should be able to get enough points to buy Jug and box pulls by the time the first excavator comes. We start immediately working on the easter egg, so if the first excavator isn't decompressing tunnel 6, we restart. We are only at round 5-7 at this point so it's no big deal. If the excavator comes to six first, let it decompress, then go hack it at the end of the round. You can do some of the easter egg steps out of order, but you must have 6 decompressed and the wave gun to get to the zombie soul catching steps. Once you get to the 25 zombie souls step in the easter egg, everyone should have gersch, QED, mule kick, and Mustang/Sally. We have had the entire egg finished by 15, but it starts getting hard in the 20's if you are still catching souls. Be sure that once you have the 25 souls, don't flip the switch until you are ready to catch 100 souls. If done correctly, you will start the round, flip the switch, and all have death machines to fill the 4 tubes that come up at the corners of the pyramid. Finish the last few steps, and everyone has perma perks. The earliest we have done it is round 15. This makes the rest of the game much easier.
We all have spots in the dome to run, and we always keep it air locked. If the excavator is headed for the dome, someone haul ass back to hack it, and everyone else hoard zombies to keep as few as possible from following your hacker.
Random info:
Dome zombie train spots: one is directly right when you walk out through the front door (lots of zombies come here). One is directly down the long open strip out the back door (teleport door-lots of zombies come here), one at the end of this strip where there is good lighting and a big open area (few zombies here), and the last is in front of the set up random stairs in the dome, which is right next to the guy running front door area (medium flow of zombies).
I use MP5K for points until I can buy each of these in this order: (Jug, Mule Kick, box gun, Flopper, M/Sally, Gersch/QED).
If you all run the dome, it makes it easy to revive, especially if you have perma perks. Most of the time no Gersches are even necessary.
Make sure your hacker has M/S or wave gun so they can make it back from hacking excavators with no problem.
If the red devils shows up, try to keep him with the person running the biggest circle and destroy him at the end of the round or right before a max ammo.
*If you need a max ammo, when you see a drop, throw a gersh while your designated hacker hacks it into a max ammo.
Happy Zombie Slaying
Vodstok