sudoku

(redirected from Su-doku)
Also found in: Dictionary, Thesaurus.

sudoku

or

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).
..... Click the link for more information.
. 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.

Mentioned in ?
References in periodicals archive ?
SU-DOKU 5 NUMBER CLUES 0901 736 7687 (70p/call) ROI 1515 999 077 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4622 (60p/min) ROI 1550 999 683 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0901 736 7688 (70p/call) ROI 1515 999 078 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4623 (60p/min) ROI 1550 999 684 ([euro]0.
SU-DOKU 5 NUMBER CLUES 1515 999 789 ([euro]1/call) SU-DOKU FULL SOLUTIONS 1550 999 106 ([euro]0.
SU-DOKU 5 NUMBER CLUES 1515 999 076 ([euro]1/call) SU-DOKU FULL SOLUTIONS 1550 999 682 ([euro]0.
SU-DOKU 5 NUMBER CLUES 1515 999 077 ([euro]1/call) SU-DOKU FULL SOLUTIONS 1550 999 683 ([euro]0.
SU-DOKU 5 NUMBER CLUES 1515 999 078 ([euro]1/call) SU-DOKU FULL SOLUTIONS 1550 999 684 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0906 447 1430 (61p/call) ROI 1515 999 787 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4380 (61p/min) ROI 1550 999 104 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0906 447 1431 (61p/call) ROI 1515 999 788 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4381 (61p/min) ROI 1550 999 105 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0906 447 1432 (61p/call) ROI 1515 999 789 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4382 (61p/min) ROI 1550 999 106 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0901 736 7686 (60p/call) ROI 1515 999 076 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4621 (60p/min) ROI 1550 999 682 ([euro]0.
SU-DOKU 5 NUMBER CLUES 0901 736 7687 (60p/call) ROI 1515 999 077 ([euro]1/call) SU-DOKU FULL SOLUTIONS 0900 586 4622 (60p/min) ROI 1550 999 683 ([euro]0.