so me and my friends just did this and it worked amazing, you dont have to follow this exactly but it worked pretty good,

okay so at the beggining we were going to all do nothing but buy the syth or whatever you call it (pardon my spelling) so we all got m14's and got to round 6 in the first room, we tryed to mostly knife as it gives you more points, at the end of round 6 we got a crawler, and each had around 6000 points, then we opened the top door, then take a right keep going and then buy the next door on the right, after that DO NOT buy the next door on the right, buy the door straight ahead, go down the hill a little bit and there will be a stair case on the right, go up the staircase and make a left, go up those stairs and buy the next door, you should now be where a lunar lander is located, everybody buy the cyth (make sure everyone has enough before you buy the doors). now for the next 2 rounds everyone goes 1337 ape sh1t with their pistols out and does nothing for knife, (it will be a one knife kill till round nine)by doing this everyone should aquire between 2000 - 4000 points extra. now go to the staircase by the rocket but instead of taking a left towards the syth, make a right, turn on the power (you can do this before round 7 and 8 if you have enough, now everybody use the mystery box, try and get a good weapon that you will want to upgrade, no this is where the stratagy comes in. first, you will need a crawler at the round of round 8 or 9 to get your guns, then after go ride all of the lunar landers and launch the rocket, you may also want juggernaug. after you do all of this go to the lunar lander by the PhD Flopper, there is a barrier at the top of the stairs, and one in the room with the perk. have 1 person guarding each barrier and 2 people at the top of the main stairs, (make sure you call the lunar lander as soon as you can. now when it gets really crowded and you guys have no choice, throw a black hole bomb (if you have them) everyone get on the lander and buy it, now if you dont have the two first doors on the bottom floor open going towards the power you better have enough. the lander should bring you to the main room, now everyone go through the bottom door and straight up to the power, go down the stairs leading to the third lunar lander and jump out the whole in the wall on your left, now just make your way back to the lunar lander by the PhD Flopper, and call it everyone take positions and repeat the process over and over. (it may also be a good idea to alternate between the lander by PhD Flopper and Stamin-Up)

this technique may sound bad but it is more than capable of getting you to round 30+, any feedback?