| Sudoku (Japanese: sūdoku), sometimes spelled Su Doku, is a
logic-based placement puzzle, also known as Number Place in the United
States. The aim of the canonical puzzle is to enter a numeral from 1 through
9 in each cell of a 9×9 grid made up of 3×3 sub-grids (called "regions"),
starting with various numerals given in some cells (the "givens").
Each row,
column and region must contain only one instance of each numeral. Completing
the puzzle requires patience and logical ability. Its grid layout is
reminiscent of other newspaper puzzles like crosswords and chess problems.
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