- Correct pronunciation: soo-DOH-koo (three syllables, stress on the second)
- The name is Japanese: 数独 — a contraction of Sūji wa dokushin ni kagiru
- It translates to "the digits must remain single" — i.e., no repeats
- The name was given by Japanese publisher Nikoli in 1984
- The original Western name was "Number Place," coined in the USA in 1979
How to Pronounce Sudoku
In English, Sudoku is commonly said as soo-DOH-koo — three syllables, with the stress on the second. In Japanese, all three syllables are roughly equal in weight: suu-doh-ku. Either is understood globally, but the Japanese pronunciation keeps all vowels short and even.
The word is written in Japanese as 数独 (sometimes seen as 数毒 in early print, but the standard form uses 数独). It is always pronounced the same way regardless of which characters are used.
What the Name Means
数独 is a contraction of the phrase 数字は独身に限る (Sūji wa dokushin ni kagiru), which translates to "the digits must remain single" or "single digits only." This is a direct description of the core rule: each digit 1–9 appears exactly once in every row, column, and box.
| Japanese | Romaji | Meaning |
|---|---|---|
| 数 | sū | number / digit |
| 独 | doku | single / alone |
| 数独 | sūdoku | "single digit" |
The American Origin and the Japanese Name
The puzzle was invented by American architect Howard Garns and first published in Dell Pencil Puzzles & Word Games in 1979 under the name Number Place. It was introduced to Japan by publisher Nikoli in 1984, who renamed it 数独 — a name that spread globally when the puzzle became a worldwide phenomenon in 2004–2005.
So the game is American in origin but Japanese in name. Most players worldwide use the Japanese name without knowing either fact.
Why the Name Matters for Learning
"Single digit" is not just a name — it is the entire rule. Every technique you learn in solving strategies is a way of enforcing that one constraint. When you use Naked Singles, you are finding the one digit that can remain single in a specific cell. When you use scanning, you are finding where a specific digit can be single in a specific box.
Understanding that the name encodes the rule helps new players remember it instinctively. Ready to apply it? Try a free Easy puzzle right now.