Sudoku is a combination logic-based number sorting puzzle game.
The object of the game is to fill in the numbers in a 9×9 grid such that each column, each row, and each of the nine 3×3 subgrids make up the main grid (also called the "box", "block"). ", or "area") contain all the digits 1 through 9.
The puzzle has been partially completed, the player must continue to solve it by filling in the numbers. Every well-established puzzle has a unique way of doing it.

The completed game boards always form a sort of Latin square matrix with an added restriction on the content of each subgrid area. For example, every single integer will probably not appear twice in the same row, column, or any one of the nine 3x3 subgrids/subdivisions of the 9x9 game board