It was a long time ago, Partshade. I am still revisiting old levels and trying to get three stars in them all. Right now I am working on levels between 250 and 260. Now I see why I was stuck on those levels for days in a row. 252 and 253 I still have a hard time beating. I see that level 258 has only one star.
I only do this if there are no new levels and if either I beat the Daily Challenge or it expires. I have a lot more levels to deal with, but beating them adds to my main count of stars that allows me to level up, usually three gems or a handful of feathers, but there it is.