Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits from 1 to 9 so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contains all of the digits from 1 to 9. SUdokuIQ provides a partially completed grid on every page load, which for a well-posed puzzle has a single solution.
Completed games are always a type of Latin square with an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same row, column, or any of the nine 3×3 subregions of the 9x9 playing board. read more