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HowLongToBeat on X: It takes on average 12 hours to beat Batman: Arkham Asylum (25.2 hours for completionists). / X

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In Batman: Arkham City (2011), you can find Harley Quinn's outfit from Batman: Arkham Asylum (2009) in Joker's Fun House, complete with Warden Sharp's ID tag. : r/GamingDetails

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