Rough Economy Trophy
First: To Crazy Cheats, I was just trying to be helpful and I didn't mean to upset you.
Not sure if everyone knows this or not, but you can get the Rough Economy Trophy (3 kills with one bullet) in the Nazi Zombie Mode which makes it easier to do than in the regular game mode.
If you need more help, we've got more Call of Duty: World at War cheats and also check out all of the answers for this game
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