The objective is to fill the (9 x 9) grid such that each column, row and each of the 9 (3 x 3) sub-grids contain all of the numbers from 1 to 9, without repeating any numbers within the column, row or sub-grid.
The objective is to fill the (9 x 9) grid such that each column, row and each of the 9 (3 x 3) sub-grids contain all of the numbers from 1 to 9, without repeating any numbers within the column, row or sub-grid.