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Sudoku is a logic-based placement puzzle born in Japan, and now have attained international popularity (particularily in Western Europe and North America).
(It is a trademark of puzzle publisher Nikoli Co. Ltd in Japan.)
If you have not, try it here!
http://www.sudokulive.net/
and Nikoli's official site
http://www.nikoli.co.jp/puzzles/1/
*The name "Sudoku" is the Japanese abbreviation of a longer phrase, "Suuji wa dokushin ni kagiru," meaning "the digits must remain single".
(It is a trademark of puzzle publisher Nikoli Co. Ltd in Japan.)
If you have not, try it here!
http://www.sudokulive.net/
and Nikoli's official site
http://www.nikoli.co.jp/puzzles/1/
*The name "Sudoku" is the Japanese abbreviation of a longer phrase, "Suuji wa dokushin ni kagiru," meaning "the digits must remain single".