o that's right, me + 2 mates achieved our new personal best of round 23, and we had the following scores: - We started with 4, but a guy lagged out after like round 5, so we had 3 people with the number of zombies for 4 people.

51k(he had fail guns)
86k(me)
111k(my mate).

Credit goes to MwT MaGiiKzZ(HoboDefuse) & me for this method.

You need basic experience of "Five" for this, I will not go through the basics - see my other strategies for that.

Get to about round 10, with atleast 7k each person & all get packa-punched weapons(Assault Rifles/LMGs the best) + Speed Cola, Juggernaught & Double tap(importance in that order).

Now go to the middle level, and on the mp5k wall, go to the door which is furthest from the lift. One person covers this door - this person should have a shotgun, or you just swap around every round who covers it(they'll get least kills). Now one person covers the corridor looking at the lift, and one person covers the other corridor. If you have 4, this one can just provide support.

This is all you do, get crawlers if you want to packa-punch more weapons, but you should get ammo fairly often.

Thanks for reading,