Middle Hotel - Batman Arkham Origins Guide - IGN

Batman: Arkham City - IGN

Confronting Poison Ivy - Batman: Arkham Asylum Guide - IGN

Batman: Arkham City - Wikipedia

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

The biggest games of our lifetime #9: 'Batman: Arkham Asylum

Give me a challenge to complete Arkham city with, like only taking down thugs with beatdowns : r/BatmanArkham

Can You Beat Batman: Arkham Asylum (New Game Minus) with Gadgets Only?

What is the worst thing about each game? : r/BatmanArkham

Riot Shield, Arkham Wiki

Batman: Arkham City - Armored Edition (Wii U) review: Batman: Arkham City - Armored Edition (Wii U) - CNET