A
B
C
D
E
F
G
H
I
1
9
5
7
6
4
2
7
1
5
9
8
3
4
7
9
3
2
4
5
6
5
6
7
9
1
6
1
7
2
5
4
8
7
8
7
6
3
4
9
8
9
6
3
9
7
3
6

Rules:

The object of the game is to fill all empty cells with numbers 1 to 9 in such a way that each number appears only once in a column (vertical), in a row (horizontal) and in a block (3×3 cells).