Nintendo Switch Online in December – classics return and online fighters sharpen up

Table of Content

Nintendo has outlined December additions for Nintendo Switch Online, spanning new classics, a co‑op brawler, a rollback‑ready fighter package, and a limited‑time year‑in‑review in the Nintendo Music app. The headline is Wario World joining the Nintendo GameCube – Nintendo Classics library, alongside several retro titles for Game Boy and NES. There is also a new MARVEL co‑op release with online play, plus a Mortal Kombat collection focused on smooth online matches. Below – the key details without storefront fluff.

Nintendo GameCube – Nintendo Classics grows: Wario World lands on Switch 2

GameCube’s Wario‑led 3D action platformer Wario World is now part of the Nintendo GameCube – Nintendo Classics catalog. As confirmed by Nintendo, this GameCube Classics library is available exclusively on Nintendo Switch 2. Expect the series’ signature treasure‑hunting and brawler‑style platforming translated into the Classics format.

Trailer: https://www.youtube-nocookie.com/embed/6wZZI8a4uDI

More retro arrivals: Game Boy and NES updates

The 8‑bit and handheld vaults expand with several additions to Game Boy – Nintendo Classics and Nintendo Entertainment System – Nintendo Classics on Nintendo Switch. The lineup spans action and platforming staples from the late 80s‑early 90s era.

• Game Boy: Kid Icarus: Of Myths and Monsters; BIONIC COMMANDO
• NES: Ninja Gaiden II: The Dark Sword of Chaos; BATTLETOADS

Highlight reel: https://www.youtube-nocookie.com/embed/YC1CL0RaeUU

Co‑op on demand: MARVEL Cosmic Invasion (Switch 2 and Switch)

MARVEL Cosmic Invasion supports local and online play with a drop‑in/drop‑out adaptive system, allowing teammates to join or leave without derailing a session. It is available on both Nintendo Switch 2 and the original Nintendo Switch, aiming squarely at quick‑match co‑op fans and family play.

Trailer: https://www.youtube-nocookie.com/embed/T01KOhvakhU

Rollback netcode focus: Mortal Kombat – Legacy Kollection (Switch 2 and Switch)

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The Mortal Kombat: Legacy Kollection emphasizes online stability with rollback netcode, a technique designed to keep inputs responsive and preserve attack precision across long‑distance matches. The collection is available on both Nintendo Switch 2 and Nintendo Switch.

Year in review returns: Nintendo Music app window and data range

NSO members can look back at their listening with a limited‑time feature in the Nintendo Music app for smart devices. The recap is available until Monday, January 5, 2026 at 4:59 pm PST and uses data from January 1, 2025 – November 30, 2025. Access is tied to Nintendo Switch Online membership.

Animal Crossing: New Horizons – seasonal designs via Dream Address

Nintendo has released holiday sweater‑style custom designs for Animal Crossing: New Horizons through the in‑game Custom Designs Portal on the company’s official island. To visit, use the Dream Address: DA-6382-1459-4417. This distribution taps into the series’ regular seasonal customization, no purchase messaging attached.

Platform and feature snapshot

The table below summarizes where each item lands and the standout feature. It’s a quick reference for players deciding what to boot up first.

Final checkpoint – what this means for players

If you’re on Nintendo Switch 2, the GameCube Classics track with Wario World is the clear new‑gen perk. If you’re on Nintendo Switch, the GB/NES drops keep the retro flow going, while MARVEL Cosmic Invasion and MK’s rollback‑powered package cover co‑op and competitive cravings. The music recap and ACNH designs round out seasonal extras – quick to try, easy to share.

General roundup video: https://www.youtube-nocookie.com/embed/DaPq9Z2xgCY