Who Invented Sudoku? Origin and History Timeline
By Michel ·
Sudoku a Day Blog
Quick answer: Howard Garns is credited with the modern puzzle published as Number Place by Dell in 1979. Nikoli introduced it in Japan in 1984 and gave it the name Sudoku. The Times began publishing it in November 2004, helping bring it to a wider audience.
Sudoku history timeline
- 1782: Euler publishes his study of Latin and Graeco-Latin squares, a mathematical connection to Sudoku rather than the modern puzzle itself.
- 1979: Dell publishes Number Place, the modern puzzle credited to Howard Garns.
- 1984: Nikoli introduces the puzzle in Japan and later shortens the name to Sudoku.
- 2004: The Times of London publishes Sudoku, helping trigger the global newspaper boom.
- Today: Sudoku lives in newspapers, books, apps, printable PDFs, variants, and daily online puzzles.
Sudoku has a Japanese name, an American publication history and a connection to older mathematics. Its story is easier to follow if we separate the grid structure, the modern puzzle and the name.
Latin Squares: the mathematical ancestor
Euler studied Latin squares: grids where each symbol appears once in each row and column. The Euler Archive dates his paper on Latin and Graeco-Latin squares to 1782. A completed classic Sudoku also has the Latin-square property, but this mathematical relationship does not make Euler the inventor of the modern puzzle.
Euler's Latin Squares did not include the 3x3 box constraint that makes Sudoku unique. That came much later.
Number Place: the American prototype
In 1979, a puzzle called "Number Place" appeared in Dell Pencil Puzzles and Word Games magazine in the United States. It was a 9x9 grid with the three constraints we know today: rows, columns, and 3x3 boxes. The puzzle was designed by Howard Garns, a retired architect from Indiana.
Penny Dell records that Number Place has appeared in its puzzle magazines since 1979. The identification of Garns came later: puzzle historian Will Shortz compared the contributor lists in issues with and without Number Place.
Japan gives it a name and a culture
In 1984, the Japanese puzzle publisher Nikoli introduced Number Place to Japanese readers under the name "Suuji wa dokushin ni kagiru," which roughly translates to "the digits must be single." That name was shortened to "Sudoku," and the puzzle found its audience.
Nikoli says that in 1986 it adopted symmetrical clue placement as a construction rule and that the puzzle became more popular after this change. Symmetry is a design choice for the starting clues, not an extra solving rule required by every Sudoku.
The global explosion
Wayne Gould, a retired judge from New Zealand, encountered the puzzle during a visit to Japan in 1997. He developed software to generate Sudoku puzzles and later supplied them to The Times.
The Times began publishing Su Doku in November 2004. Its book publisher, Collins, records that date and credits Gould as the puzzle supplier. This was an important step in the puzzle's spread through English-language newspapers and books.
Once the rules are understood, a classic grid requires no vocabulary or arithmetic. The same grid can therefore be used by readers of different languages, although its instructions still need to be understood.
Sudoku today
Today, Sudoku is available in newspapers, apps, books and websites. Variants offer different constraints, from Killer Sudoku to Thermo and Arrow Sudoku. These variants add or change rules; they are distinct from the classic format.
But the core puzzle remains the same as Howard Garns designed it in 1979: a 9x9 grid, three simple rules, and pure logic. No math, no language, no luck.
For more on how the rules work, visit our Sudoku rules page or explore Sudoku variants to see how the original concept has been expanded.
Why it endures
The same three constraints work on paper and on a screen. A printed grid gives you space for pencil notes, while digital versions can provide entry controls and optional assistance. The format can change without changing the classic rules.
To experience those rules yourself, play a daily Sudoku and choose a difficulty that suits you. The familiar grid still follows the row, column and box constraints used in Number Place.
Frequently Asked Questions
Who invented sudoku?
The modern 9×9 sudoku puzzle was popularized by Maki Kaji in Japan in the 1980s under the name Sudoku, meaning 'digits must be single.' The format was based on an earlier American puzzle called Number Place, created by Howard Garns in 1979.
Is Sudoku Japanese?
The name Sudoku is Japanese, and Japanese publisher Nikoli helped shape the puzzle's modern style. The 9×9 format itself came from the American puzzle Number Place, created by Howard Garns.
When did sudoku become a worldwide phenomenon?
The Times began publishing Su Doku in November 2004, an important milestone in its spread to a wider audience. The puzzle already had an earlier history in American and Japanese publications.
What does the word sudoku mean?
Sudoku is short for the Japanese phrase Sūji wa dokushin ni kagiru, which means 'the digits must remain single' — a reference to the rule that each digit appears exactly once in every row, column, and box.