Last year, Rocksteady's Batman: Arkham Asylum contained an easter egg featuring concept art and plans for its upcoming sequel, Batman: Arkham City . Problem is, almost nobody noticed it until recently.

More Batman: Arkham Asylum

Batman+may+not+approve+of+these+plans,+but+we+sure+do.

Unless you're a pyro, the secret walled-off room stemming from the Warden's office was probably left in peace. Should you care to commit a little more destruction (Hey, why not? The asylum is a mess anyways), we've got a video walkthrough to help you find your way.Inside the room lies a blueprint approved by Warden Quincy Sharp for Arkham Thanks to IGN reader Jacky Foong for tipping us off to this secret area. What do you make of these plans? Let us know in the comments below.