Modern Sudoku began as Number Place in an American magazine

From an Indiana puzzle designer to a Japanese name

Howard Garns, an architect from Indiana, created the puzzle later known as Sudoku. When it appeared in a U.S. puzzle magazine in 1979, it was called Number Place—a name that described the task more than the experience. Players had to place digits in a grid so each row, column, and smaller box contained the required numbers without repeats.

That arrangement made the puzzle distinctive: the solver was not calculating an answer but using constraints to narrow possibilities. A digit that could fit several places at first might become forced once other entries ruled out alternatives. Each placement changed what was possible elsewhere, turning a quiet grid into a chain of deductions.

How “Number Place” became Sudoku

The puzzle reached Japan through imported puzzle publications. The publisher Nikoli popularized it there and gave it the shorter name “Sudoku,” drawn from a longer Japanese phrase about digits appearing only once. The new name traveled with the puzzle as it spread beyond Japan, while the original English title faded from common use.

The change in name reflects the puzzle’s two-stage history: Garns devised its grid in Indiana, and Japanese publishers helped shape how it was presented and recognized. Its enduring appeal lies in that simple premise—every number must obey several rules at once—yet each puzzle can make those rules interact in a fresh way.