ontology, role and music package. According to the information about the game of Music World 2, the paid content of Music World 2 includes ontology, role and music package. Music World Seiters 2 is a music game developed by Rhea Games in Taiwan Province, China. Music World Seiters 2 inherits the intuitive and simple game mode of its previous work Music World, adds more tapping methods and improves the game picture and plot.