Edge:This stylish South Korean iOS game will attract a number of comparisons to Osu! Tatakae! Ouendan, though its riff on rhythm action is more like another iNiS game, Demon’s Score, given a Sin City makeover. It’s a revenge tragedy in comic book form, as a cybernetically enhanced mobster returns to exact bloody retribution for the deaths of his wife and daughter. He accomplishes this by sprinting down corridors and cutting up henchmen in time to a driving, percussive soundtrack that makes up in energy for what it lacks in melody.