First you buy quick revive. Then for the first 2 rounds you knife.

On the third round use your pistol a little bit and knife. If it gets overwhelming get M14 and shoot 1 and knife. Use same thing for round 4.

On 5 open top door, then open until you're in big staircase and buy stakeout. Go kill zombies in barriers in the room first, then guard the stairs by stakeout by facing opened door.

If zombies start to overwhelm you run down stairs and throw a grenade right under your feet. At end of round 5 open the door to the dressing room and go near the other door but don't open it.

It should be a dog round so you want them to come one way. The stakeout kills them in 1 shot.

If you need to reload open the door to the stage while reloading. Don't turn the power on.

After you kill the last dog you get max ammo. If you have come across the box open it. If you haven't buy the weapon down there. Don't trade stakeout.Don't turn the power on unless you're getting overwhelmed.

If you do get overwhelmed run and get juggernogg and quick revive if you don't still have it.

When you get enough points pack-a-punch a gun, preferably a machine gun. Don't forget if you get firesale pack-a-punch it only costs a 1,000.

If you still have a gun that came off the wall, if you follow my directions you'll be able to pack-a-punch it and upgrade it's ammo.

Keep buying all the perks you find and the bowie knife if you have enough.

I did this and I lasted to wave 78.

Believe me it's hard even if you manage to open the box and get alien blasters.