It’s very normal for Nintendo to release updates for their Switch games. Most of the updates they release are usually for games that released in the past few years. However, once in a blue moon, they’ll give the Switch games they released in the early years of the console’s life some attention.
This is no exception. Nintendo has released an update for Super Mario Maker 2. Once you update, the game should be at version 3.0.3. Unfortunately, the patch notes are very small. In fact, all Nintendo says is that they “made adjustments to make for a more pleasant gaming experience”.

Worse update ever!!!
It’s always so funny and vague when Nintendo does a minor update on a game that hasn’t been updated in years
Damn. Was hoping they added Waluigi
Seriously, why not add amiibo support like how they worked in the OG Mario Maker on Wii U? At least their own characters (surprisingly, Sonic, Mega Man, Pac-Man, and some other third-party characters appeared in SMM1 when their amiibo were scanned), is that truly so much to ask?
I’d make an entire Super Waluigi World if he was in the game.
It would potentially break many levels at this point. I don’t think SMM2 ever had an ability that let you be one unit high and still break blocks… except maybe a shell hat? I can’t remember.
Was hoping for New super Mario bros wii maker 🙁
Well they legit said that they weren’t gonna make anymore huge updates in 2021 so that wouldn’t be possible
OK the 3.0.3 patch, Some people have found that the update patch they did was to the ninja speed run on the mario maker.
https://youtube.com/shorts/sZ4_3kJkteg?si=BRPMKxZVXckPP-s0