9
3
5
2
6
1
3
7
7
5
6
1
2
8
7
4
5
7
9
2
3
8
2
5
9
4
1
3
6
6
7
9
2
1
"If you want to be happy, be." — Leo Tolstoy
"If you want to be happy, be." — Leo Tolstoy
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.