If you’re looking for legitimate information about Super Mario Maker 2 :
"Made adjustments to make for a more pleasant gaming experience". Technical Deep Dive & Community Insights super mario maker 2 nsp actualizacion 303
How to Update Super Mario Maker 2 | Nintendo Switch | Support If you’re looking for legitimate information about Super
If you get "303" immediately after launch, your firmware is too low. Use to update your Switch’s firmware to 14.1.2 or 15.0.1 . Update 3.0.0 requires at least firmware 12.0.0, but 14+ is recommended for stability. but 14+ is recommended for stability.