Imagine Rock Star for the Nintendo DS is a music simulation game where players step into the shoes of a budding musician working to become a superstar. Players can create and customize their own rock star avatar and band, choosing from a variety of instruments like guitar, bass, drums, and vocals. The gameplay involves successfully hitting notes and chords in time with the music to perform songs and win competitions. Players can also manage their band's schedule and style, engaging in the full rock star experience. The game's genre blends music rhythm with life simulation elements.