Sudoku -- from Wolfram MathWorld

Sudoku (literally, "single number"), sometimes also is a pencil-and-paper logic puzzle whose goal is to complete a grid satisfying various constraints. In the "classic" Sudoku, a 9×9 square is divided into 3×3 "regions", with various squares filled with "givens." Valid solutions use each of the numbers 1-9 exactly once within each row, column and region. This kind of sudoku is therefore a particular case of a Latin square. Under the U.S.-only

Professor Stewart's Cabinet of Mathematical Curiosities , Stewart

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Mrs Perkins's Quilt

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Why does Wolfram Alpha gives the wrong answer? : r/CasualMath