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Once you have made your way through
Call of Duty 5: World at War you are given a little extra feature to extend gameplay.
Suddenly you are held up in a burnt out building with waves of Nazi zombies coming at you with increasing speed and intensity.
As you kill each group you go up levels and they become progressively harder, challenging you to survive as long as possible.
Though the game mechanics are the same there are a few things to keep in mind to extend your fight.