Church Hostages - Batman: Arkham City Guide - IGN

Joker's sniper is nearby, but in order to pinpoint his location you'll need to examine the two points of contact made by the bullet.

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If you return to the church after freeing all of Riddlers hostages

Church Hostages - Batman: Arkham City Guide - IGN

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Stop Protocol 10 - Batman: Arkham City Guide - IGN

I was playing through Arkham city again. Noticed the identity

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Steam Community :: Guide :: Enigma Conundrum. Riddler's Hostages Guide