so glad there's a topic for this. dreaming of making my own mario levels is one thing that propelled me into becoming a software engineer.
here's some screenshots of my levels, the codes are included in the screenshots. "days" 1 through 4 are basically me messing around with each of the new tools Nintendo gave during that day, and trying to make the most enjoyable level that i could within the limits of that day. 1-4 together form a "world" that i play in my course bot. day 4 "castle" wasn't meant to be Castlevania inspired, but you can tell i play a lot of castlevania. still working on day 5 "airship". pipe hills is another level i made on day 1 that i thought had a fun little challenge in it.
i'll be sure to try everyone's courses that they post, so if you see an avatar with a round head, short blond hair, and glasses going by "Andy" (youknowandy) on your course, that's me.