I finally completed one of these number puzzles without peeking. 100% perfect, done in the din of a coffee shop I stopped at before driving half an hour to a client's place just to match some colors. While doing the puzzle, he calls me from the other end of the state, and while talking, I got his verbal OK on my proposed color choices, so I didn't have to make the trip after all. Sometimes it pays off to be dragging things out. My day's on a roll - got to keep it spinning....