Sudoku - Wikipedia, the free encyclopedia
Sudoku (数独, sūdoku?, Digit-single) i/suːˈdoʊkuː/, originally called Number Place,[1] is a logic-based,[2][3] combinatorial[4] number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 ...