Batman: Arkham City is an open-world action-adventure game set in a vast prison district of Gotham City. Players control Batman as he navigates this dangerous environment, taking on iconic villains like the Joker, Penguin, and Two-Face. The game features enhanced free-flow combat, new gadgets, and a rich story filled with twists and turns. It also introduces side missions and a larger world compared to its predecessor. Arkham City is praised for its engaging gameplay and immersive world-building, making it a standout in the superhero genre.