Riddler

With an obsessive need for attention, Edward Nigma is determined to be the most outlandish of Gotham City's criminals, concocting elaborate series of clues and riddles around his crimes. Batman has proven a worthy opponent, capable of deducing the Riddler's plans, but Nigma is dedicated to creating a mystery the Dark Knight will not be able to solve in time to save the hostages.

Batman: Arkham Asylum
The Riddler was one of the many inmates who escaped Arkham Asylum after the Joker took control of the island. The Riddler made his way to a hidden location in Gotham City and contacted Batman by hacking into the communication signal the Dark Knight used to contact Oracle. In order to boast his superior intellect, the Riddler had organized a series of riddles around the island, ranging from a number of small Riddler Trophies hidden in out-of-the-way spots to elaborate perspective puzzles. After escaping, he challenged Batman to find these, along with the additional challenge of solving riddles that described specific objects in various rooms.

Batman steadily solved every riddle, with the Riddler boasting his superiority to begin with but slowly becoming more enraged with Batman. Before solving the last few riddles, Batman located the Riddler's signal and notified the police of his whereabouts. After solving his final riddle, the Riddler began to implement Gotham's "greatest riddle." But before he could do so, the GCPD broke into his hideout on 229 O'Neil Avenue in Old Gotham. The police arrive there and arrest Riddler as he quotes to Batman that he cheated on his riddles.