the founder or creator of this walkthrough is me (a3n draqscopz)

using this strategy i got up to 22 on splitscreen and 16 on xbox live. check the leaderboards

step 1: when the round starts everyone guard a window/s with your pistol knife and grenades until round three. DO NOT BUY ANY WALL WEAPONS YET!

step 2: at the end of round three make a crawler and start heading to the power room and make sure everyone has the AK74U before buying the next door. DO NOT WORRY ABOUT HITTING THE BOX OR GETTING JUG UNTIL ABOUT ROUND FIVE WHEN THE POWER IS ON.

step 3: kill the crawler and head up to the mine cart and one person get the window, one person get the wall so zombies don't jump over it, one person get one of the trails and one person get the other. NOTE! this is for four player so if you have less people then you will have to divide it up differently.

step 4: stay there until about round 10-12 then make another crawler and start opening the opposite side of the map and decide whether or not to pack a punch. IT IS RECOMMENDED!

step 5: head back to the top of the mine cart and survive as long as you can constantly making crawlers and hitting the box in between rounds. some people may ask why at the top of the mine cart? because if you get overpowered you have an escape route if needed.

if you are wondering about durty dur, it is my nick name. if you find it successful, unsuccessful or have any questions please make a response and i will try to update this strategy as soon as possible. +rep and thanks are greatly appreciated because i worked very hard finding testing and posting this!