Example Sudoku.txt

Facili

3 x 7 x x 8 x 9 6
8 6 2 9 5 7 x x 1
x x x 6 x x 2 x 8
4 7 6 x 8 9 x 5 x
x x 8 x 1 x 3 6 x
x 3 x 2 7 x x 8 4
7 x 4 x x 1 x x x
x x 3 5 4 2 x 1 9
x 9 1 7 x x 8 4 5

x 4 x 8 x x x 5 x
2 x x x x 3 x x x
x x x x 4 6 x x x
x 8 x x 6 x 3 x 5
x x 4 x x x 2 7 x
x 5 x 2 7 x x 6 4
8 x 3 x 9 5 x x x
x 6 x x x 7 x 2 x
x x x 1 2 4 8 x 6

Normali

x x x x x x x 8 4
5 x x x 4 2 6 x x
x x 4 x x x x 2 x
x 4 x x 6 3 7 x x
x x x x x 1 x x 3
6 3 x 9 5 7 2 x x
x 5 x x x 9 x x 6
3 2 x 8 x x 1 x 9
x x 9 5 x x 8 x x

x 4 8 7 6 x 3 2 5
2 x x x x 4 x 9 x
x 3 5 x x 2 1 7 4
3 2 x x x 5 6 x 8
5 x x x x x 7 3 x
8 x 6 x 4 7 9 x 2
4 6 3 x 5 9 x 8 7
x 5 x 6 2 8 4 x x
x x x x 7 x 5 6 x

Difficile

x 3 x 5 x 2 x x 6
6 x 7 3 4 x x 5 2
5 x 8 x 7 x x x 3
x 6 x x 3 4 x x 9
8 x x 7 x 5 3 x x
1 5 3 x 2 x 4 x 7
3 x x x x 6 x x x
2 7 5 4 x x 6 x x
9 4 x 8 1 x 2 3 5

x 4 x 8 x x x 5 x
2 x x x x 3 x x x
x x x x 4 6 x x x
x 8 x x 6 x 3 x 5
x x 4 x x x 2 7 x
x 5 x 2 7 x x 6 4
8 x 3 x 9 5 x x x
x 6 x x x 7 x 2 x
x x x 1 2 4 8 x 6