Popular Science



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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