6
1
3
4
7
2
8
4
3
1
5
8
6
3
2
5
5
9
7
4
9
4
6
5
8
5
4
7
5
5
9
8
"If you know the enemy and know yourself, you need not fear the result of a hundred battles." — Sun Tzu
"If you know the enemy and know yourself, you need not fear the result of a hundred battles." — Sun Tzu
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.
There are Sudoku variants with extra constraints: Killer Sudoku (cage sums), Diagonal Sudoku, and even 3D Sudoku.