
A user named "Bunny" has created a series of Super Mario Maker levels that can be strung together to create what they call "Super Mario Maker World". The world is played in the style of a traditional Mario level which is impressive, full list of levels and user page can be found within the article.

Super Mario Maker's last level has been beaten, after Trimming the Herbs was revealed to be totally bogus.

Super Mario Maker has been a great series for Nintendo, but it is time to move on. How about a Metroid Maker? That would be interesting! Check out Jason Capo’s thoughts for more.
I'd go either for Metroid Maker a Zelda Maker would also be great even a Mario Kart Maker as well.

Nintendo has announced that as of Jan. 12, 2021, the original Super Mario Maker game for the Wii U will not be available for purchase on the eShop.
I mean there is a sequel available. My guess is Nintendo will want you to move towards a more current version.