Theatrhythm is a rhythm-based video game series developed by Indie Zero and published by Square Enix. It features music from various Final Fantasy titles and other Square Enix games, allowing players to tap, slide, and hold notes in time with the music. The gameplay combines rhythm mechanics with role-playing elements, where players can form parties of characters from the Final Fantasy universe. The series debuted on the Nintendo 3DS in 2012, with subsequent titles released on other platforms, including mobile devices. Players can unlock new songs, characters, and abilities as they progress, enhancing the overall experience and encouraging replayability.