Ferriss: Makikaji was a great puzzle maker. He is called the Godfather of Sudoku, and he died about a year ago. On his whiteboard, he wrote three symbols to represent what happens in puzzles. The question mark refers to the bafflement you feel when you first encounter a puzzle. And so the arrow, that was where you're solving. That's the struggle, that's the trying things out,. experimenting, and then the exclamation point is the aha moment.

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