3
7
5
4
1
5
9
8
4
3
9
7
1
2
8
5
9
2
5
3
7
6
4
9
7
1
8
9
1
3
4
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.
"It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change." — Charles Darwin
"It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change." — Charles Darwin