Keeping a Batman Arkham Knight Riddler guide by your side will ... Once you start the Man-Bat mission, you'll be sent here. Scan the drawing on his whiteboard. "I bet you weren't invited to ...

Batman: Arkham Knight has a lot of secrets that still many players don't know about and this is just one of them.

Drawing inspiration from The Dark Knight, Zur's sonar tech mirrors ... method in The Dark Knight. As long as Batman has tossed criminals into Arkham Asylum, they've always escaped.