Sudoku

The goal of Sudoku is to fill a 9×9 grid with numbers so that each row, column and 3×3 section

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 sub grids that compose the grid contain all of the digits from 1 to 9.