Batman: Arkham City - Harley Quinn's Revenge (Video Game 2012) - IMDb
Harley Quinn (Batman: Arkham City) by Ammie | ACParadise.com
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 City - Part 13 - Harley Quinn's Revenge - YouTube
Screenshot of Batman: Arkham City - Harley Quinn's Revenge (Windows, 2012) - MobyGames