Ok, so what we do is go to the power room, turn it on, link the teleporter, get in, defend it for as long as possible then go up in into the pak o punch room. We through nades down till it takes us back, then we run the long way around back to the power room shooting zombies as they follow us. Just keep doing it over and over. Ill have a headset so ill show yo as we go. Hope you can understand me.