Super Smash Bros. Ultimate gets Switch 2 upgrade but there’s a problem

Nintendo has issued a warning for online play in Super Smash Bros. Ultimate on the Switch 2, although there are some benefits to playing on the new console.

One of the best features of the Nintendo Switch 2 is the amount of original Switch games which have received upgrades, ranging from paid-for overhauls in Zelda: Tears Of The Kingdom to free improvements in Pokémon Scarlet and Violet.

However, as highlighted by Nintendo prior to the Switch 2’s launch, not every game has had a smooth transition between consoles, with titles like Ring Fit Adventure, 1-2-Switch, and WarioWare: Move It! coming with some caveats when played on the new system.

While these titles have understandable issues connected to the lack of IR motion camera in the Switch 2 Joy-Con, one title which has encountered a bizarre problem is Super Smash Bros. Ultimate – and it’s all because of Mii Fighters.

As highlighted by X user OatmealDome, and noted on the Switch 2 compatibility list, Super Smash Bros. Ultimate has an issue in online play if someone is using a Mii Fighter character during matches against a Switch 2 user and someone on the original Switch console.

‘If someone is using Mii Fighter, the match may end immediately,’ Nintendo states. ‘Until this is fixed, please avoid using Mii Fighter in online play as much as possible.’

Nintendo highlights there may be issues with displaying the Mii Fighter’s thumbnail too. ‘When creating or editing and saving a Mii Fighter, the thumbnail image showing the Mii Fighter may not be made correctly. This may be improved by saving it again.’

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[Super Smash Bros. Ultimate]The game has some issues on the Switch 2.• If a Switch 1 and Switch 2 play together online and one uses a Mii Fighter, the match may immediately end.• Mii Fighter thumbnails may not save correctly.An update will be released soon.(thanks Pau) https://t.co/3I9HdveuuW

In regards to both these issues, the note concludes: ‘This is planned to be fixed in the near future.’

While the issue is fairly minor, it’s perhaps indicative of a wider problem with Miis on the Switch 2. In Mario Kart World, for example, there is no option to drive as your Miis like in Mario Kart 8 Deluxe, despite them being featured on the system.

ALTERNATE COSTUMES LOAD INSTANTLY ON SWITCH 2 FOR ULTIMATE!!!!!!!! LittleMacMain (@LittleMacMainKO) June 5, 2025

This issue aside however, there are some improvements in performance when playing Super Smash Bros. Ultimate on the Switch 2.

As highlighted by users on X, alternate costumes on the character select screen now loads instantly, whereas before it took a few seconds, with load times in general being much faster.

While Nintendo didn’t list Super Smash Bros. Ultimate as one of the games set to receive an upgrade on Switch 2, it seems most first party Switch games are improved on the console, with titles like Xenoblade Chronicles 3 and Super Mario Bros. Wonder also getting minor updates.

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