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su doku

(so͞odō`ko͞o) [Jap.,=single number], a number puzzle consisting, in its classic form, of a square divided into nine squares, with each smaller square divided into nine boxes, thus forming an overall grid of 81 boxes. To solve the puzzle, a single number (from 1 to 9) must be entered in each blank box so that each number is used only once in each smaller square and only once in each row and column in the larger square. A number of the boxes are always filled in by the maker of the puzzle, providing both clues and limitations to where the solver may place numbers, and the degree of difficulty of the puzzle is determined by which numbers the puzzle maker chooses to reveal as clues. Variations include the use of larger or smaller squares than the 9-box-by-9-box classic grid, irregular divisions of the overall grid, and additional restrictions on the placement of the numbers.

The modern origins of sudoku appear to lie with Dell Puzzle Magazines, which has published nine-square "Number Place" puzzles since the 1970s. Such puzzles are based on, but more complicated than, the Latin squares described by the 18th-century Swiss mathematician EulerEuler, Leonhard
, 1707–83, Swiss mathematician. Born and educated at Basel, where he knew the Bernoullis, he went to St. Petersburg (1727) at the invitation of Catherine I, becoming professor of mathematics there on the departure of Daniel Bernoulli (1733).
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. In 1984 Nikoli publishers began publishing sudoku puzzles in Japan. Nikoli limited the number of boxes filled in as clues to less than 30, and required that the clues form a symmetrical pattern. In this form sudoku became popular in Japan and by 2005 common in the United States and other countries.

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After all, if I want to do mental gymnastics I'll take up Sudoko.
Durham Police was offering officers tips on golf, creative writing, disaster training, guitar skills, weight management nutrition, dance and exercise, sudoko challenge, mountain biking and home computer maintenance.
This follows the success of existing call-TV formats Quizmania and Play Sudoko, broadcast on ITV1 and ITV2 overnight in the last three months, the firm said.
We're also expecting an electronic version of the puzzle Sudoko to fly off the shelves.
Mother-of-four Estelle Evans, aged 35, of Winsford Avenue, Allesley Park, will travel to London's Pinewood Studios for the Sudoko Challenge, being screened on Sky One tomorrow, at 9pm.
Amaru has enhanced the offering of 55-channels of on-demand entertainment on its M2Btv Global Broadband TV service delivered through the PONY set-top box by adding interactive casual games like Push'n'Shove, Deal With It and Sudoko, with more to come in the near future.
One British importer has ordered 1740 crates full of sudoko games, nursery rhyme books, jigsaws and soft toys.
A Sudoko nut, Furlong's school years were when his love for maths and technical drawing flourished.
I had spent days filling more boxes than a Sudoko annual.
Yesterday dozens of children from four schools sampled some of the maths challenges on offer ( including a no-left-turn maze and countdown and sudoko games.
20: Spent first part of the education doing Sudoko, not interacting with the group.