Call of Duty: World at War Tips

Nazi Zombie Strategy
Okay, first off, using only the pistol can get you enough points the first two rounds to open the help door. After that in between rounds, open the random box to collect the two 100/500 weapons (one of them is the Browning M1919). Now only opening the second set of stairs, stay in the far corner where the other stairs and grenades are. Now you only have to focus on the upstairs door-way and the window to your right. The last zombie to come through into the building will be the slowest one. This gives you an opportunity to grab ammo or board up windows. Using this strategy I've been able to get as far as round 12 by my self, hopefully you can do the same or further.