PangaeaPanga and his new roommate, TonesBalones, have created and beaten a very hard co-op level in Mario Maker 2. While the co-op clear check was not strictly necessary to upload the level, the duo pulled it off regardless. With a clear time of over 6 hours, this will be quite a challenge for anyone wanting to beat it as well.
Judging from Panga’s youtube video, they had a lot of fun trying to beat their creation. The clear starts at 5:34.
Course ID: 1X4-P53-C3G
Note that the level starts with a contraption that detects if you’re playing by yourself or with other people, so if you go in alone you will end up in the single player portion of the level. The single player challenge resembles the co-op part, but is adjusted for being beatable by just one player. If you’re curious, you can watch Syun’s clear video.