This reference covers Theatrhythm Final Bar line’s Nintendo Switch NSP update and downloadable content (DLC). It’s written to help players, archivists, and enthusiasts understand what the Switch release includes, how updates and DLC are packaged and distributed, installation and legal considerations, typical problems and troubleshooting, and how to manage content on consoles or in archival contexts. Where the terms “NSP” and similar appear, they are described in neutral, factual terms to inform users about formats and distribution practices; this reference does not endorse piracy or circumvention of platform protections.