The History of Sudoku – THE HOURGLASS

Logic, patience and a pencil: that’s all you need to defeat Sudoku’s 9×9 grid. At first glance, the maze of numbers and empty squares seems like a mathematical quandary. But upon closer inspection, Sudoku requires no mathematical skill at all. It also doesn’t require general knowledge (like crossword puzzles) or linguistic ability (like word games)

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The History of Sudoku – THE HOURGLASS

The History of Sudoku – THE HOURGLASS

Hanayama hourglass help!! : r/mechanicalpuzzles

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The History of Sudoku - 18th Century, by Komeil Mehranfar

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The History of Sudoku – THE HOURGLASS

The Sudoku: Its historical evolution - puzzlingcut