Where Was Sudoku Invented?
Sudoku was invented in Indianapolis, Indiana, United States, where the retired architect Howard Garns created it for Dell Magazines in 1979 under the name Number Place. It was then reinvented commercially in Tokyo, Japan, where the publisher Nikoli renamed it Sudoku in 1984 and gave it the rules of elegance it still follows. Its worldwide launch happened in London, England, when The Times printed its first Sudoku on 12 November 2004. Three cities, three countries, three distinct acts of invention.
The short answer, country by country
| Place | Year | What happened there |
|---|---|---|
| Indianapolis, USA | 1979 | Howard Garns builds the first 9×9 puzzle with 3×3 boxes; Dell prints it as Number Place |
| Tokyo, Japan | 1984 | Nikoli reprints it, renames it Sudoku, adds symmetry and a clue cap |
| Hong Kong / New Zealand | 1997–2004 | Wayne Gould writes generator software and pitches the puzzle to newspapers |
| London, England | Nov 2004 | The Times publishes it; the global craze begins within weeks |
| France | 1892–1895 | Newspaper number grids that resemble Sudoku but predate the box rule |
Indianapolis: where the puzzle was actually built
Howard Garns lived and worked in Indianapolis, Indiana. He spent his career at an architectural firm, retired, and kept building puzzles for magazines as a private occupation. The first Number Place appeared in Dell Pencil Puzzles & Word Games #16, May 1979, printed without a byline, as Dell printed everything.
Nothing about the location was strategic. Garns was not part of a puzzle scene, was not connected to Japanese publishers, and had no plan for the format beyond selling it to a magazine that bought puzzles. He built the grids by hand at a desk in Indiana, and the format that came out of that desk is the format the whole world now solves.
Tokyo: where it became Sudoku
In 1984 the Japanese publisher Nikoli, based in Tokyo, picked up the puzzle from an American magazine and printed it in Monthly Nikolist. Its first Japanese name was a full sentence — Sūji wa dokushin ni kagiru, roughly "the digits must be single" — and it was quickly shortened to Sūdoku. The abbreviation was registered as a trademark by Nikoli in Japan, which is why Japanese publications other than Nikoli still call it Number Place or Nanpure.
Tokyo is where the puzzle acquired its aesthetics. Nikoli added two conventions that Dell never had:
- 180° rotational symmetry of the givens. The pattern of clues looks the same rotated half a turn. This is purely visual — it does not change difficulty — but it is what makes a Sudoku grid look designed rather than random.
- A cap of roughly 32 givens. Dell puzzles often carried 35 or more clues, which makes them nearly mechanical. Capping the count forces the solver to actually reason.
Nikoli also ran a reader-submission model. Solvers built puzzles, sent them in, and the best were printed. Over a few years that produced a community of constructors competing on elegance, which is the real reason the Japanese version of the puzzle is the one that travelled.
London: where the world found out
The puzzle reached the general public through The Times of London on 12 November 2004. Within weeks the Daily Mail, the Telegraph, the Guardian and the Independent had all added one. Within months it was in newspapers on every continent. If you remember Sudoku appearing suddenly and everywhere, that is the moment you are remembering, and it happened in London.
The man who put it there was Wayne Gould, a retired Hong Kong judge from New Zealand. He found the puzzle in a Tokyo bookshop in 1997, spent six years writing a program to generate and grade puzzles, and then offered them to newspapers free of charge — taking his revenue from the puzzle books and software that followed instead of from licensing. Free supply removed every reason for an editor to say no, and that pricing decision is why the spread was measured in weeks rather than years.
France: the near-miss, 1892–1895
French newspapers ran number-grid puzzles in the 1890s that come surprisingly close. Le Siècle printed a 9×9 magic-square variant with removed digits in 1892. La France went further in 1895, printing a puzzle whose 9×9 grid required 1–9 in every row, every column and both diagonals — and whose 3×3 subsquares, as it happens, also contained 1–9.
Historians disagree over how deliberate the subsquare property was. What is not disputed is that the rule was never stated to solvers, never made part of the solving logic, and disappeared entirely when French newspapers dropped the format around World War I. A rule that is present by accident and never used is not the same as a rule that is designed and taught. That is the reason the invention is dated to 1979 in Indiana and not to 1895 in Paris.
Switzerland: the Euler myth
You will often read that Sudoku was invented by Leonhard Euler, the Swiss mathematician, in the 1780s. This is wrong, and it is worth understanding why the claim keeps circulating.
Euler studied Latin squares: n×n grids in which every symbol appears once per row and once per column. A completed Sudoku grid is a Latin square, so the two are genuinely related. But Euler was not making puzzles — he was doing combinatorics, on grids of any size, with no boxes, no givens and nobody expected to solve anything. The box constraint that turns a Latin square into a solvable human puzzle is not in his work at any point.
Was Sudoku invented in Japan or America? The honest answer
Both claims are defensible because they answer different questions, and most arguments about this are people answering different questions at each other.
| Question | Answer |
|---|---|
| Where were the rules first printed? | United States, 1979 |
| Where did the name come from? | Japan, 1984 |
| Where were the design conventions set? | Japan, 1984 onward |
| Where did it become a global puzzle? | England, 2004 |
| Where does the underlying mathematics come from? | Switzerland, 18th century |
If someone asks you where Sudoku was invented and wants one word, the correct one-word answer is America. If they ask where the Sudoku they actually play was shaped, the answer is Japan. Both statements are true and they do not conflict.
How the puzzle physically travelled
- Indiana to New York, 1979. Garns mails puzzles to Dell Magazines; Dell prints them nationally as Number Place with no author credit.
- New York to Tokyo, 1984. Nikoli staff encounter the puzzle in an American magazine, reprint it, and rename it.
- Tokyo to Hong Kong, 1997. Wayne Gould buys a Nikoli puzzle book while travelling and starts writing generator software.
- Hong Kong to London, 2004. Gould walks into The Times with a supply of computer-generated puzzles and offers them free.
- London to everywhere, 2005. Rival papers copy within weeks; syndication, books and mobile apps follow.
Every leg of that route depended on an individual noticing something in print. There was no company strategy behind it at any stage.
Where was Sudoku invented if you mean the modern computer version?
The Sudoku most people meet today — on a phone, with difficulty ratings, hints and instant validation — has yet another origin. Hand-built puzzles cannot supply an app that serves millions of grids a day, so the modern supply chain runs on generator and solver algorithms: a program fills a valid grid, removes clues one at a time, and after each removal runs a solver to confirm the puzzle still has exactly one solution. Difficulty is then graded by which solving techniques the puzzle requires.
That software layer began with Wayne Gould's program in the late 1990s and is now standard everywhere. So the puzzle you play on your phone was invented in Indiana, named in Tokyo, published in London, and generated by code that has no single birthplace at all.
What the 1979 puzzle actually looked like
If you could hold that Dell issue, the puzzle would be recognisable but slightly off. The grid was 9×9 with nine boxes and the rule was already the modern rule. What differed was the packaging: Dell printed some givens in bold and told solvers those digits spelled a hidden word once decoded, a habit carried over from the word puzzles filling the rest of the magazine. The instructions ran several lines long, written as if the editors doubted anyone would understand a puzzle with no words in it.
Clue counts were also unruly. Early Number Place grids sometimes carried 35 or more givens, well above the 22–30 range of a modern newspaper puzzle, because nobody had yet established how few clues a grid could survive on. Symmetry was inconsistent for the same reason: Garns built by hand, and hand construction favours whatever resolves cleanly over whatever looks balanced on the page. Both of those problems were fixed in Tokyo, not in Indiana.
Why America invented it but Japan made it work
Number Place sat in Dell magazines for five years without catching on, and the reason is structural rather than cultural. Dell sold to an audience that came for crosswords and cryptograms; a wordless logic grid was the odd item near the back with no name recognition, no newspaper slot and nobody championing it.
Nikoli supplied all three at once. Its readers were already fluent in language-free logic puzzles, so a number grid needed no selling. Its reader-submission model turned solvers into constructors, and within a few years there was a competitive culture of people trying to build more elegant grids than each other. That culture — not the rules, which came from Indiana — is what produced a puzzle worth exporting.
Frequently asked questions
Where was Sudoku invented?
In Indianapolis, Indiana, in the United States. Howard Garns, a retired architect, created the puzzle there and Dell Magazines published it in May 1979 under the name Number Place.
Was Sudoku invented in Japan?
No — but the version everyone plays was shaped there. Japan is where the puzzle was named Sudoku in 1984 and where the conventions of 180° symmetry and a roughly 32-clue maximum were established. The rules themselves were first printed in America five years earlier.
Who invented Sudoku?
Howard Garns (1905–1989). He was never credited during his lifetime because Dell printed puzzles anonymously. He was identified years after his death by comparing Dell contributor lists across issues.
What was Sudoku originally called?
Number Place, in the United States from 1979. Nikoli's original Japanese name was Sūji wa dokushin ni kagiru, shortened to Sūdoku in 1984.
Why is Sudoku still called Number Place in Japan?
Because Nikoli trademarked the name Sudoku in Japan. Other Japanese publishers therefore use Number Place or its abbreviation Nanpure. Outside Japan the trademark does not apply, which is why the rest of the world uses Sudoku freely.
Did Sudoku come from China?
No. The confusion comes from ancient Chinese magic squares such as the Lo Shu, a 3×3 grid whose rows, columns and diagonals sum to 15. Magic squares are about sums; Sudoku is about placement without repetition. They are different puzzle families with no line of descent between them.
Is Sudoku based on a French puzzle?
French newspapers printed close relatives in 1892–1895, one of which happened to satisfy the 3×3 box rule. But the rule was never stated or used in solving, and the format died out before World War I. It is a precursor, not the source.
Did Euler invent Sudoku?
No. Leonhard Euler studied Latin squares, the mathematical structure a completed Sudoku belongs to, but he never used 3×3 boxes, never removed digits, and never intended anything to be solved as a puzzle.
When did Sudoku reach the United Kingdom?
12 November 2004, in The Times. Every other British national paper had added one within a few months.
When did Sudoku become popular in the United States?
2005, following the British boom — despite the puzzle having been printed in American magazines continuously since 1979. It went global before most Americans noticed it had been there all along.
Who brought Sudoku to the West?
Wayne Gould, a retired judge from New Zealand who was living in Hong Kong. He found the puzzle in Tokyo in 1997, spent six years building software to generate puzzles, and gave them to newspapers free.
Is there a Sudoku museum or monument?
There is no museum. Howard Garns is buried in Indianapolis, and his gravestone makes no mention of the puzzle — it was placed before anyone knew he had invented it.
How many Sudoku grids are possible?
6,670,903,752,021,072,936,960 valid completed 9×9 grids. Removing grids that are equivalent under rotation, reflection and relabelling leaves 5,472,730,538 essentially different ones.
What is the fewest clues a Sudoku can have?
17. A 2012 proof by Gary McGuire's team in Dublin used exhaustive computer search to show no 16-clue puzzle with a unique solution exists.
Where to go from here
The geography of Sudoku is really a story about three people in three countries who each did one thing: one built it, one named it, one gave it away. Read more on who created Sudoku puzzles, or start solving with our free Sudoku solver and our beginner's guide to the rules.
