Basics - Batman: Arkham Asylum Guide - IGN

Batman: Arkham Asylum Walkthrough - GameSpot

Batman: Arkham Asylum Game of the Year Edition Xbox 360 1000150449 - Best Buy

How long is Batman: Arkham Origins?

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

Batman Arkham Asylum is the mother of superhero games

Beat Down, Arkham Wiki

Batman: Arkham Asylum - Lutris

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Batman: Arkham Asylum Game of the Year, PC - Steam