Where are the tonebase levels?

I have the very same question. I have been away from the guitar and Tonebase for some months due to a rather bad hand injury and the following surgery. Now that I'm back to see if there are things I could still play on the guitar, I find that the navigation of the site has changed a bit and the levels are nowhere to be found. Obviously, levels will always be somewhat arbitrary. People are different, have different musical backgrounds and learn in various ways and don't always find the same pieces easier or more difficult. But that doesn't make levels useless. It would still be meaningful to get a more fine-grained indication of the difficulty of a piece when searching for the next piece to learn. Currently, the filters available are "all levels", "intermediate", (intermediate-advanced, seemingly not in use) and "advanced".  I would prefer a more detailed scale in order to easily find a suitable suggestion for my next piece. As it is now users have to look elsewhere (e.g. guitarburst.com) to get an indication of the level of a piece. This solution doesn't seem the best  for either the users or Tonebase.