Original: Batman: Arkham Asylum
If Batman: Arkham Asylum was the Dark Knight's Legend of Zelda, then Arkham City is A Link to the Past. In other words, it improved on its predecessor in massive ways.
The original set a new bar for video game adaptations, and Arkham City retained everything that was great in that game: the fluid combat, the bevy of cool gadgets, the stellar writing and voice performances, the fun cameos—the list goes on.
But to that it added one of the most interesting open worlds in recent gaming history. Oh—and Batman could fly around endlessly in it. Wonder how Arkham: Origins will improve on that?