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Old 06-22-2013, 04:35 PM   #2
Join Date: Nov 2010
Posts: 107

Gamertag: xTMx Voytek
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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