This video is not to show you how to do get it done because I am not sure what i did to get this to work. My game is glitched and never gave me the lvl 30 achievement so maybe it has something to do with that?

How it works.
Start or join a lobby.
Kill a few zombies and wait for the game to save.
Leave game & start it up again.
Boom 600k every time.

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