Pop'n Music 4: Append Disc is a rhythm game developed by Konami for the Sega Dreamcast, part of the Pop'n Music franchise. This installment features new tracks from the arcade version and reintroduces the Beginner mode, which was absent in prior home versions. It is an append disc that requires Pop'n Music 2 or another Key Disc from the series to function.
Pop'n Music 4 is one of the many titles in Konami's long-running rhythm game franchise, and the second of two `Append Discs` that require either pop'n music 2 or another Key Disc in the series in order to play. This particular release includes new music from the arcade version, and also restores the Beginner mode that has been previously removed from the home releases.