Nintendo Switch Online’s December update: classics, co‑op and a 2025 music rewind

Nintendo has outlined what’s new for Nintendo Switch Online in December. The update mixes fresh retro additions, new online-capable releases, and a limited-time Nintendo Music 2025 rewind for members. Highlights include Wario World joining the GameCube – Nintendo Classics library on Switch 2, new Game Boy and NES titles on Switch, a co-op focused MARVEL release with drop-in/play, and a Mortal Kombat collection using rollback netcode. There’s also a seasonal Animal Crossing: New Horizons design drop with an official Dream Address.

Classics roundup – GameCube, Game Boy and NES

Wario World expands the GameCube – Nintendo Classics lineup. Notably, the GameCube – Nintendo Classics app is available only on Nintendo Switch 2. Nintendo also rotated in two Game Boy titles and two NES titles for Switch, broadening the retro library available to active members.

• Nintendo GameCube – Nintendo Classics (Switch 2): Wario World
• Game Boy (Switch): Kid Icarus: Of Myths and Monsters; Bionic Commando
• NES (Switch): Ninja Gaiden II: The Dark Sword of Chaos; Battletoads

Watch the official rundowns:
Monthly overview,
Wario World spotlight,
Retro additions trailer.

Co-op focus – MARVEL Cosmic Invasion

Designed for team play, MARVEL Cosmic Invasion supports both local and online co-op and features a drop-in/drop-out adaptive system to keep sessions moving as players join or leave. The game launches on both Nintendo Switch and Nintendo Switch 2.

Watch the official trailer: https://www.youtube-nocookie.com/embed/T01KOhvakhU

Read also our article: Nintendo Switch Online + Expansion Pack drops two Ubisoft N64 titles

Competitive online – Mortal Kombat: Legacy Kollection

Mortal Kombat: Legacy Kollection prioritizes online play quality with rollback netcode – a technique that helps preserve input precision across long distances. The collection is available on Nintendo Switch and Nintendo Switch 2.

Nintendo Music 2025 rewind – limited-time member perk

Nintendo Switch Online members can access a year-in-review inside the Nintendo Music app for smart devices. The feature is available until Monday, January 5, 2026 at 4:59 pm PST, summarizing listening data from January 1, 2025 to November 30, 2025. This is an NSO members-only feature.

Animal Crossing: New Horizons – holiday sweater designs

Seasonal custom sweater designs are available in Animal Crossing: New Horizons via the Custom Designs Portal on Nintendo’s official island. To visit, use the following Dream Address when speaking to Luna on your island:

At-a-glance: what’s new and where

Here is a quick platform overview of the December additions and features. The table summarizes platforms and the headline feature for each item.

Final takeaway – why it matters

December’s lineup leans into variety: a GameCube-era platformer on Switch 2, handheld and NES staples on Switch, plus online-forward releases for co-op and competitive fans. For members, the Nintendo Music rewind and Animal Crossing designs add seasonal flavor. If you play online, rollback netcode and drop-in/drop-out co-op are the practical upgrades to note – they shape how smooth your matches feel right now.