# sudoku

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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).
. 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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Complete a Suduko or a cryptic crossword each morning.
Instead he took on the challenge of doing the arrangements himself on the computer, which he describes as "like a Suduko puzzle".
Sonja Hughes, of Allerton, said: 'I can usually complete the Suduko but Saturday's was the hardest yet and I wanted to check where I went wrong.
From brain fitness activities to the daily crossword puzzles and Suduko, learning new activities is an important step in maintaining and improving brain function at all ages.
19 /PRNewswire/ -- Puzzle and game lovers should be prepared to set aside their Sunday crosswords and daily suduko tune-ups.
With two radio shows, a suduko quiz show on BBC2, a 'day job' presenting breakfast news on Sky and a phone ringing with offers every other week, Eamonn's in big demand.
By < enabling anyone from anywhere on the modern social Web to < play classic games like Hearts and Suduko with one another, < Mytopia is helping to drive the \$2.
He's going to finish off his Suduko before his mid-morning snack.
Suduko (makes my head hurt), iPods (too much work) and autumn's fashionable capes (do I look like a superhero?
Get activity books and do brain teasers, crossword puzzles or Suduko.

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