I really do enjoy these puzzles. The site is user friendly. I just do the puzzles for relaxation, but you can compete with others if you choose. The only problem I have with it is, if you don't do the puzzle in one sitting, it will start coming undone. Usually it is just a few pieces that are undone, but last night the whole puzzle was gone. I didn't redo it, I just chose another puzzle and hoped it wouldn't do the same thing.