Batman: Arkham City, Arkham Wiki

Batman: Arkham City is a 2011 action-adventure video games developed by Rocksteady Studios. It is the sequel to the 2009 video game Batman: Arkham Asylum. The game was released by Warner Bros. Interactive Entertainment for the PlayStation 3, Xbox 360 and Microsoft Windows. The game was officially announced during the 2009 Spike Video Game Awards and was released worldwide for consoles, beginning in North America on October 18, 2011, and the PC version in November. A Wii U version, called Arkham

Catsuit, Arkham Wiki

Batman (Arkhamverse)/Gallery - Batman Wiki

Just because rocksteady didn't make it doesn't mean it's not cannon 💀 : r/ BatmanArkham

Arkham - Wikipedia

Batman: Arkham City, Arkham Wiki

Batman: Arkham City Escape, Board Game

Catwoman, Arkham Wiki

Nightwing, Arkham Wiki

Batman: Arkham City Lockdown (Video Game 2011) - IMDb

In Batman Arkham Origins, we know that Batman has yet to cross paths with Dick Grayson, but five years later Tim Drake is Robin. How was Batman able train three different robins

Batman Arkham Knight, Wiki