Official Super Mario Maker Thread - Mario Maker for 3DS has been released?! Ok...

[Never]

I've so far released two levels.

King Jellybrain's 4 Secret 1Ups (85AE-0000-0033-F73B)
Which as the name suggests has 4 1up mushrooms to find.

And Big Mario, Little Mario (which requires you to be big or little depending on the section).

(D74A-0000-0036-B0F6)