This work is the world famous musical "CAT" as the theme of the music game. The combination of music games and traditional classic opera has been realized, allowing players to have a new understanding of musicals. The game uses SAI, Clip Studio Paint, live2D and other platforms for art production, and the Unity engine is used as the main engine for game development. The game is divided into three levels, players can freely choose to play tracks. In order to make the game more interesting, the game role to restore the original musical part of the role, players can choose to play the role. For the players to bring a richer and more dreamy game experience.