Batman: Arkham Asylum - The Warden's Secret Room - YouTube
Batman: Arkham Asylum | Arkham Wiki | Fandom
The secret room in Arkham Asylum showing plans for...
In Batman: Arkham Asylum, blowing up a wall in the Warden's Office reveals a secret room that shows blueprints for "Gotham City" - hinting at the game's sequel, Arkham City. : r/GamingDetails