Some actual game developers are trying their hand at making Super Mario Maker 2 stages. Nintendo briefly had a stage code list of some of them on the Switch's news feed, but it appears to have since been removed. So, if you happen across stages made by the pros, let us know here!

Yooka-Laylee Developers (Playtonic Games)

Stage Name	Level ID	Developer(s)
A Crate Job	7M1-TFF-T5G	Hamish Lockwood (Designer)
Treetop Arcade	Y4S-HT1-SSF	Daley Johnson (Engagement Director)
The Sacrifice!	66F-JLW-30H	Karl Roe (Programmer)
Flight of the Bomblebees	S4C-GS5-MGF	Matt Griffin (Audio Designer)

Nintendo Life has a great article in which it interviews each of the designers about their stages. Read here: http://www.nintendolife.com/news/2019/0 ... _2_courses

I must have just been blind, because I now see the other developer stages on the Switch's News Feed. They are as follows:

Indie Developers

Stage Name	Level ID	Developer(s)
The Impossible Layer	XHK-NB8-11H	Playtonic Games
Cadence of Mario???	HFH-D53-60G	Brace Yourself Games
Ding Dong, It's-a me, Mario!	HF7-BXD-3YG	Nickervision
4 Keys (2 players only)	L4L-8FX-NFG	Ghost Town Games
Berzerk Rush	JTY-647-39G	Berzerk Studio
The Key of Adventure	0KR-5Y1-LNF	Sabotage Studio