What is the meaning of Sudoku?

Sudoku is a shortened form of the Japanese phrase sūji wa dokushin ni kagiru, which means roughly “the digits must be single” or “digits are limited to one occurrence.” It refers to the rule that each digit appears once per unit.

Is Sudoku a Japanese word?

Yes — the modern brand name is Japanese. The underlying number-place puzzle had earlier Western magazine roots; Nikoli popularised the Sudoku name and format in Japan.

What does Sudoku mean in English?

There is no single English word equivalent. People describe it as a “number place” or “digit logic puzzle.” The name emphasises uniqueness of digits, not mathematics.

How do you pronounce Sudoku?

Common English pronunciation is soo-DOH-koo (stress on the second syllable). Japanese is closer to soo-doh-koo with even timing.

Etymology · Origin

Sudoku meaning

What the word Sudoku actually means — and why the name fits the puzzle so well.

What is Sudoku? → Play free

The short answer

Sudoku comes from Japanese. It is an abbreviation of sūji wa dokushin ni kagiru (数字は独身に限る) — often translated as “the digits must remain single” or “digits are limited to one occurrence.” The name points at the core rule: each digit appears only once in a row, column or box.

Breaking down the phrase

Sūji (数字) — numerals / digits.
Dokushin (独身) — single / unmarried; here, “appearing alone.”
Kagiru (限る) — to limit / restrict.

So the “meaning of Sudoku” is not “math puzzle.” It is “unique digits.” That is why replacing 1–9 with letters still works — uniqueness is the point.

History in brief

Number-place grids ran in US magazines in the late 1970s. In the 1980s, the Japanese publisher Nikoli refined and named the modern Sudoku. Worldwide newspaper popularity exploded in the mid-2000s. Today “Sudoku” is the global brand for the classic 9×9 logic grid and its smaller cousins.

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FAQ

What is the meaning of Sudoku?: Sudoku is a shortened form of the Japanese phrase sūji wa dokushin ni kagiru, which means roughly “the digits must be single” or “digits are limited to one occurrence.” It refers to the rule that each digit appears once per unit.
Is Sudoku a Japanese word?: Yes — the modern brand name is Japanese. The underlying number-place puzzle had earlier Western magazine roots; Nikoli popularised the Sudoku name and format in Japan.
What does Sudoku mean in English?: There is no single English word equivalent. People describe it as a “number place” or “digit logic puzzle.” The name emphasises uniqueness of digits, not mathematics.
How do you pronounce Sudoku?: Common English pronunciation is soo-DOH-koo (stress on the second syllable). Japanese is closer to soo-doh-koo with even timing.

Sudoku meaning

The short answer

Breaking down the phrase

History in brief

Related guides

FAQ

More free Sudoku to play