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The objective of Soduku game is to fill a  9×9  grid with digits so that each column, each row, and each of the nine  3×3  sub-grids that compose the grid (also called “boxes”, “blocks”, “regions”, or “sub-squares”) contains all of the digits from 1 to 9. A solved Soduku game is like:

To check if a  9×9  grid is a valid solution, we need to check every row, every column and  3×3  subgrids. It is not hard to check rows and columns, but checking subgrids is little tricky. When considering going through the grid only one time, it will be much harder.

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