Sudoku is a logic-based, combinatorial number-placement puzzle. In classic Sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9.
Our professional edition follows the same rules as The Hindu or The New York Times daily puzzles, featuring rotational symmetry and a unique logical solution for every level.