The Idolmaster: Cinderella Girls is a Japanese free-to-play simulation video game developed for the Mobage social network platform for mobile phones. It was first released for feature phones, and compatibility was later on extended to iOS and Android devices. The game is based on The Idolmaster franchise, and features a cast of new idol characters. The story in Cinderella Girls follows the career of a producer in charge of leading and training prospective pop idols to stardom. Its gameplay follows a collectible card game format in which each idol is represented as a card, which the player may use to form a unit of idols to train in lessons, take to jobs, and compete against opponents.