Sudoku

Sudoku is a classic logic-based, combinatorial number-placement puzzle that has captured the minds of players worldwide. 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 contain all of the digits from 1 to 9. As a traditional puzzle, it requires purely analytical thinking and no internet connection, making it available in thousands of digital and print variations.