Time: 00:00:00

Sudoku 20x20 num: 257 (Level: hard)

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