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The Complete History of Sudoku

Is the Name Sudoku Trademarked?

Sudoku is a registered trademark only in Japan. In the rest of the world, where it is not trademarked, the puzzles can be called sudoku without restriction.

In Japan, because it is trademarked, sudoku is generally referred to as Number Place.

Read about Eight sudoku myths.

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More About Sudoku

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Sudoku - the puzzle that addicts