The History of Sudoku
From an 18th-century mathematician to a puzzle played by hundreds of millions
Sudoku feels timeless, but the puzzle as we know it is barely fifty years old — and its family tree runs through Switzerland, France, Indianapolis, Tokyo, and a retired judge in New Zealand. Few games have a stranger passport.
Euler and the Latin square (1780s)
The mathematical ancestor of Sudoku is the Latin square: an n×n grid in which every symbol appears exactly once in each row and column. The Swiss mathematician Leonhard Euler studied them in the 1780s while investigating what he called "Graeco-Latin squares," treating them as objects of pure combinatorics. Euler never intended a puzzle — there were no clues, no solving, just structure. But rows-and-columns-without-repeats is the DNA every Sudoku carries.
The French newspaper puzzles (1890s)
A century later, French dailies flirted with something startlingly close to the modern puzzle. Papers like La France published 9×9 number-placement grids — some even using 3×3 regions — where readers filled in missing digits. They were a minor curiosity, faded within a couple of decades, and were forgotten so completely that the modern puzzle had to be invented all over again.
Number Place: the modern puzzle is born (1979)
The Sudoku you play today first appeared in May 1979 in Dell Pencil Puzzles & Word Games, under the name Number Place. Its creator — identified years later by puzzle historians — was Howard Garns, a 74-year-old retired architect from Indianapolis. Garns added the two ingredients Euler and the French papers lacked: the 3×3 boxes as a third constraint, and a set of starting clues leading to a single unique solution. He died in 1989, never knowing his puzzle would conquer the world.
Japan gives it a name (1984)
In 1984 the Japanese publisher Nikoli imported Number Place, and its president Maki Kaji christened it sūji wa dokushin ni kagiru — roughly "the digits must remain single" — soon shortened to Sudoku ("single numbers"). Nikoli added the refinements that shaped its feel: rotationally symmetric clue patterns and a cap of around 30 clues. In a country whose writing system makes crosswords awkward, a language-free logic puzzle thrived; Japan filled magazines with it for two decades while the West paid no attention.
Wayne Gould and the global craze (1997–2005)
In 1997, Wayne Gould, a retired Hong Kong judge from New Zealand, picked up a Sudoku magazine in a Tokyo bookshop. He spent six years writing a computer program that generated puzzles, then pitched them to The Times of London, which printed its first Sudoku on 12 November 2004. Within months every British paper carried a daily grid; by mid-2005 the wave hit the US, and Sudoku became the fastest-spreading puzzle since the crossword craze of the 1920s — TV shows, championships, bestseller lists and all.
The mathematics catches up
The boom pulled mathematicians back in, completing Euler's circle. In 2005, researchers computed that there are 6,670,903,752,021,072,936,960 valid completed Sudoku grids. In 2012, an exhaustive computer search settled the biggest open question: no 16-clue Sudoku with a unique solution exists — 17 clues is the proven minimum. Competitive speed-solving, world championships (held annually since 2006), and endless variants — killer, samurai, diagonal — keep the research and the rivalry alive.
Sudoku goes digital — and cosmic
The past two decades moved Sudoku from newsprint to screens, adding the conveniences paper never had: automatic pencil marks, unlimited puzzles, difficulty curves, streaks, and daily challenges shared by every player at once. Cosmic Sudoku is our contribution to that lineage — a free, browser-based take that wraps Garns's 1979 invention in a 777-level journey from Earth to the edge of the universe, with a lo-fi jazz soundtrack for company. Euler would recognise the grid instantly. We like to think he'd stay for the music.