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How To Play Sudoku
The Game of Sudoku is played on a grid measuring 9 rows and 9 columns of cells. Each cell is either empty or contains a number from 1 to 9. Your job is to fill in all of the empty cells such that:
1) each row contains all of the digits from 1 to 9 with no digit appearing more than once
2) each column contains all of the digits from 1 to 9 with no digit appearing more than once
3) each of the nine 3 x 3 subgrids (indicated by thicker lines) must also contain all of the digits from
1 to 9 with no digit appearing more than once
When all of the cells have been filled and the above conditions have been met then you have successfully completed the Sudoku puzzle.