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For the achievement in Call of Duty: Zombies, see 40 Knives (Call of Duty: ZOMBIES).

40 Knives is a Nazi Zombies related trophy/achievement. It is available in Call of Duty: World at War on the map Der Riese. It requires the player to kill forty zombies with the Bowie Knife.

This achievement/trophy is easiest to earn if the player buys the Bowie Knife before round 10, due to the Bowie Knife losing its one hit kill ability after that round. The players will need at least 6750 points to earn this achievement/trophy, with 3750 to unlock the required doors and the other 3000 for the Bowie Knife itself.

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