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There are a lot of alternate costumes in Arkham City, that once downloaded will change the look of

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Riddler's Revenge - Batman Arkham Knight Guide - IGN

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Costumes - Batman Arkham Knight Guide - IGN

Arkham Knight - Batman Arkham Knight Guide - IGN

Costumes - Batman Arkham Knight Guide - IGN

Own the Roads - Batman Arkham Knight Guide - IGN

Costumes - Batman Arkham Knight Guide - IGN

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Costumes - Batman Arkham Knight Guide - IGN