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Old 06-22-2013, 04:35 PM   #2
Voytek
 
Join Date: Nov 2010
Posts: 103

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Did you ever resolve this? My best guess would be that you have to beat the story completely on ONE difficulty. So that means if you play it half on normal and half on nightmare, it won't unlock. If you haven't already, try playing the levels you played on nightmare with your friend on normal and see if that does the trick.
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