I have enjoyed the levels from 700 and up. They seem to make more sense to pass and there is nothing worse then being stranded on a level for days. Zaps the fun right out of game for me. And my game time is my "me time". I enjoy CCF more then CCS which used to be my favorite. But some levels are just impossible and frustrating to pass.
Competing for the Crown and after earning the crown having unlimited lives for awhile to beat levels and move up. I am on level 1430 and I enjoy the challenges