Warner Bros. Games has officially released its free-to-play prequel to the "Arkham" series, "Batman: Arkham Underworld," on iOS devices.

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The PVP action game, which was developed by Turbine (the team behind the mobile "Infinite Crisis" game), allows players to control one of five Batman villains: Harley Quinn, Riddler, Mr. Freeze, Killer Croc or Scarecrow. As one of Batman's finest adversaries, players navigate through the underbelly of Gotham City and attempt to build the ultimate hideout, recruiting an army of henchmen, and battling through story-missions within the city's neighborhoods. But be careful -- if your empire becomes too big, you may (or definitely will) get a visit from Batman...

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Check out some character art for "Batman: Arkham Underworld" below:

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"Batman: Arkham Underworld" is currently available for download on the App Store for iPhone and iPad.