RULES: The objective of sudoku is to enter a digit from 1 through 9 in each cell, in such a way that: - Each horizontal
**row**(shown in pink) contains each digit exactly**once** - Each vertical
**column**(shown in yellow) contains each digit exactly**once** - Each subgrid or
**region**(shown in green) contains each digit exactly**once**
not be changed. The puzzler's job is to fill the remainder of the grid with digits –respecting, of course, the three constraints mentioned earlier. |