To solve this, you'll need to scan Arkham Asylum, but finding it is tricky ... switch with your Batarang to step inside, then use the Batmobile's remote function and winch to move the walls ...

Features of the Batman: The Animated Series Gotham City (76271) LEGO set include brick-built locations and from the series such as Gotham City Court, Arkham Asylum, Wayne Manor, the Batcave and more.