I reached a milestone on chess.com by reaching a 3000 rating for solving chess puzzles. The site's puzzle rating has little to do with real chess ratings because the puzzle ratings are comparatively inflated. I have seen average club players reach puzzle ratings of 2000 or 2100.
Nevertheless, reaching 3000 took a great deal of effort.
The site presents chess problems that have difficulty proportional to your current puzzle rating. I have reached a point where I am almost as likely to fail as I am to succeed. I find that I am not analyzing as well as I should so I am trying to make myself focus deeper. The casual puzzle solver will look for what the "trick" is in the position and make a move without thinking about it too hard. However, I can no longer just make cursory judgments.
A chess master in Salt Lake City that I know has been in the 3070 to 3100 range. I would like to catch up with him.