"Underwater (Super Mario Bros.) (Ver. 2.0 Update) - Super Mario Maker 2" is a high quality rip of the Ver. 2.0 Update version of "Underwater (Super Mario Bros.)" from Super Mario Maker 2.
Joke[]
At 0:03, the rip becomes an arrangement of "Skating" by Vince Guaraldi from A Charlie Brown Christmas.
The rip loops over at 0:35.