Pop'n Music 4 Append Disc is one of the many titles in Konami's long-running rhythm game franchise. It is part of a two-part series, alongside pop'n music 2 , which requires either the previous title or another Key Disc to play. This release includes new songs from the arcade version and also reinstates the Beginner mode that had been removed from home releases.
The gameplay involves pressing buttons in time with the music and lyrics, similar to other rhythm games in the series. Players must press the correct buttons at the right time to score points and navigate through levels. The game features a variety of modes, including solo and multiplayer options, as well as a unique scoring system that rewards players for their accuracy.