4
6
5
5
1
3
8
3
7
2
4
8
4
6
9
4
7
4
1
8
1
7
6
3
6
9
2
7
4
5
3
8
1
9
2
"If you don't have confidence, you'll always find a way not to win." — Carl Lewis
"If you don't have confidence, you'll always find a way not to win." — Carl Lewis
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.