When you reach the Forbidden Grove area in Yaesha in Remnant 2, you may have encountered the Great Mystery. A note roller that needs to be adjusted. It doesn’t matter which notes you activate on the reel, it doesn’t work?
Well, it won’t work either! Because before you can solve this riddle, you first need access to the big water wheel!
If you stand by the reel, you will also see a kind of temple right next to it. There is a water wheel on the stone building, but it doesn’t work.
The first thing you should do is just ignore the riddle and move on. Because only when you are led back to this area later, you come up to the water wheel! When the time comes, you can also open all the doors on the lower floor.
In the lower level of the temple you can find a book that shows you the exact grades. Once you activate the water wheel, go back to the reel and set the notes from the book!