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Sudoku, also called Number Place, is a type of Constraint Satisfaction Grid puzzle. It is one of the more well-known types, syndicated and published all over the world.



A sudoku puzzle generally takes the form of a nine-by-nine grid, of which some of the cells are filled in with digits. These cells are called the "given numbers", or givens for short.


Place the digits 1 through 9 into the empty cells in the grid (a single digit per cell) so that each digit appears exactly once in each of the following regions: the nine rows, the nine columns, and the nine outlined 3×3 regions.


Puzzle by Wei-Hwa Huang.

Aesthetic Constraints

Published puzzles are often symmetric.


Number Place puzzles were invented by Howard Garns.


Sudoku Variants

See Also

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