Shi no numa survive to round 40
When you go down to the box, look at it ( get a gun if you want to) and after the end of the round/ very beginning of the next round, turn 180 degrees and walk forwards. Then look right to the window and walk to it and all of the zombies will come to that one window. If you want to hit the box in a round I suggest you do that when there is only one zombie left.
More tricks, tips and cheats for this game are right here - Call of Duty: World At War - Zombies cheats
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