However, if you’re asking about legitimate features of Super Mario Maker 2 with the 3.0.3 update (the final major update for the game), here are some :

If you are using a PC emulator, you typically install the "Update NSP" via the "Install Files to NAND" option in the emulator's File menu.

The 3.0.3 update for Super Mario Maker 2 is a significant one, with a range of new features and improvements that enhance the overall gaming experience. Some of the key changes include: