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Is Harley Quinn keeping a secret from everyone? Find out what it could be in this Easter Egg.
Keywords: Batman: Arkham City, Batman: Arkham City (Collector's Edition)
Tags: pc, dlc, easter, egg, arkham, secret, batman-arkham-city, guide, hidden, games, city, playstation-3, guide-secret, test, xbox-360, ps3, batman-arkham-city-collectors-edition, batman, pregnancy