Sudoku is a logic-based, combinatorial 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 sub-grids that compose the...
The numbers 1-9 have to be in each bix, row and column. So if you have one with 8 numbers, you can work out the last one. And you can see where a number goes in a box if it's in that row or column,...