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What was once derelict remains of Killinger's Department Store has been re-purposed into the Arkham Knight HQ. The headquarters are divided into two

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Batman Arkham Knight - Arkham Knight HQ - All Riddler Trophy

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How do I solve this riddle in the tower by Pedition bridge? I

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Arkham Knight HQ - Batman Arkham Knight Guide - IGN

It's actually insane that one released in 2015 and the other in

Party's Over achievement in Batman: Arkham City