The Stopwatch puzzle is a very fun puzzle to assemble. I thought it might be very challenging so it took me awhile to pull it out of my puzzle stash but I am so glad I did. Each stopwatch is a fairly unique color with a different lighter shade inside making it pretty easy in terms of a good color sort. Once you have your colors sorted, the puzzle practically puts itself together. I had a little trouble differentiating the three top pink/red colors but otherwise It was easy to tell the colors apart. The puzzle came in a sturdy box. The pieces were a nice thickness. I had absolutely no piece defects on any of the pieces. Great quality. The pieces are letter-coded on the back A-F, I believe but honestly, for this puzzle, I don't see any particular reason to use the letter codes unless you are just starting out with puzzles.
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