Nazi Zombies Single Player Strategy
When you first Start off, don't buy a weapon until round 3. Once you are at round three, buy a Carbine. At round 6 open the stairs and buy a Trench Gun. Once you have the Trench gun, go to the stairs you have not opened and camp there until round 8. Once you are at round 8 have one Nazi Zombie left over. Then open the stairs and spend your money on the Random Box, trying to get the Ray Gun. When you have the ray gun, constantly check the windows, BUT mostly guard the Stairs. You should make it to about round 15.