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The Idolmaster Cinderella Girls is a Japanese free-to-play simulation video game developed by Cygames and Bandai Namco Entertainment for the Mobage social network platform for mobile phones. It was first released on November 28, 2011 for feature phones, and compatibility was extended to iOS and Android devices on December 16, 2011. The game is based on The Idolmaster franchise, and features a cast of new idol characters. In September 2015, a music video game developed by Cygames titled The Idolmaster Cinderella Girls Starlight Stage was released on Google Play Store and Apple Store in Japan.