Popular Science

THE CLASSIC

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Dell Pencil Puzzles and Word Games magazine printed the first modern sudoku, called “Number Place,” in the 1970s. In the ’80s, Japanese publisher Nikoli took over and made improvemen­ts—as well as gave the stumper its name, a riff on a phrase that translates to “the numbers must remain single.” Instructio­ns: Enter the digits 1–9 in each nine-square box, row, and column such that no number appears in any of those areas more than once.

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