There is something irreplaceable about the first time you solve a difficult puzzle, especially one that you anticipate to be daunting. As a Sudoku enthusiast (t

There is something irreplaceable about the first time you solve a difficult puzzle, especially one that you anticipate to be daunting. As a Sudoku enthusiast (though not at Simon's level) this was surprisingly vicarious to watch for what's usually a silent solitaire experience. Well done!