Alongside an update to PAC-MAN Puzzle Tour, Warner Bros and DC Entertainment have recently announced that Batman: Arkham Underworld, their latest free-to-play game is now available for download on the App Store for iPhone and iPad. Developing on the lore and Super-Villains of the Batman: Arkham franchise, the game places players in control of Batman's greatest enemies in PVP action as they work their way up Gotham City to build a powerful army. In Batman: Arkham Underworld, players can take command of Super-Villains such as The Riddler, Harley Quinn and Killer Croc as they fight their way to the top by recruiting and training an army of henchmen through story-missions within Gotham City's neighborhoods. Player beware though, if their empire becomes too big, they'll have to face-off against Batman himself. Currently Batman: Arkham Underworldis available on the App Store for free, however, there are in-app purchases.