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The song playing during the first official Batman: Arkham City gameplay reveal trailer is "Short Change Hero" by The Heavy. Though Tim Drake is Robin in Batman: Arkham City, the Animated Series skin is Dick Grayson rather than the Tim Drake design from the revamped New Batman Adventures. It was estimated the the main storyline of Batman: Arkham City will take 25 hours to complete, with 15 hours worth of side missions. In Batman: Arkham City, Batman can keep track of the gangs in his criminal database, with territories changing in both appearance and size as the game progresses. In Batman: Arkham City Riddler thugs have replaced Riddler maps from Batman: Arkham Asylum, and will require interrogation before they will talk. Arkham City is estimated to be at least five times the size of Arkham Asylum. Arkham City's storyline will take place approximately 80% outdoors, and 20% indoors.