Can you name every level in Geometry Dash that follows the Nine Circles trend, according to the Nine Circles Demonlist?
Rated levels only, all difficulties
The NCDL has a somewhat strict definition of a "Nine Circles level", therefore, there may be levels often considered "Nine Circles" that are not present here.
Levels are ordered from oldest to newest within each difficulty
Finally updated! There are now 234 rated Nine Circles levels. I also specified that this uses the NCDL list so that it's very clear what counts for this list and what does not.