The specific reference to "WAI-WAI-PARTY-NSP-21" seems to hint at additional content or perhaps a specific event or update related to "GROOVE COASTER." This further underscores the dynamic nature of the game's ecosystem, with new developments and community activities continually emerging.

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A standard "21 DLC" bundle typically includes various "Song Packs" that expand the game's tracklist. These packs often feature:

There are currently dozens of individual packs available on the Nintendo eShop

TAITO has confirmed that a new entry in the series is on the horizon. As of 2025, the developer has announced that a sequel or new release is targeted for a 2025 release date, though save data and DLC from Wai Wai Party!!!! will not carry over to the new title. This suggests that Wai Wai Party!!!! will ultimately stand as a complete, self-contained masterpiece, while the future of the series will forge a new path. DLC updates for Wai Wai Party!!!! are expected to continue in the meantime, with the community eagerly awaiting more crossover packs, original tracks, and new features.