Rocksteady has said there are still undiscovered easter eggs present in Batman: Arkham City.
Speaking during London's Kapow! Comic Con, game director Sefton Hill confirmed players have yet to find "3 or 4" secrets in the sequel:
"Some of them we put in there that were really obscure were found within a week [like the Scarecrow code]. We didn't think anyone would ever solve that, but it only took people two days. But there are still 3 or 4 things that people haven't seen - some of them very subtle things. There's one that we had right in one of the first demos that we did that nobody has found - it's in there if you look hard enough."
While the panelists discussed Batman: Arkham City's creative processes, they refused to comment on what Rocksteady is currently working on. Sefton reiterated that the award-winning studio is definitely not working on a Teenage Mutant Ninja Turtles game. Whatever the project is, though, it'll be "something pretty exciting" with the developer stating they "have a few surprises."