My first Super World is 2 worlds, 10 levels if anyone wants to try. World 1 is normal difficulty but World 2 is definitely tricky. Here is my Maker ID: VC3-50Y-WBG.
My first Link level, Race for Epona! (20 seconds): K11-VB5-0HF
Note: You have to shoot an arrow at the on off switch. A lot of people seem to be confused there.
This is my newest one. It's a very hard 3D World level built around bouncing on trampolines and enemies: P5X-P3G-DJG
Also, as a bonus for the few people still playing SMM1: https://supermariomakerbookmark.nintendo.net/courses/EE31-0000-0404-0FA1
Posting my series of Farewell to SMM courses. They're all pretty hard and long but hopefully satisfying.
Farewell to SMM SMB1: https://supermariomakerbookmark.nintendo.net/courses/7BAF-0000-03E2-197B
This one is Zelda themed.
Farewell to SMM SMB3...