Sudoku (sūdoku digit-single) originally called number place is a logic-basedcombinatorial 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 subgrids that compose the grid (also called "boxes" "blocks" or "regions") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid which for a well-posed puzzle has a single solution.

Sudoku (Digit Digit-Single) 3 subgrids single