Daily Sudoku Competition for May 18
Tough
by Andrew Stuart
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
G
H
J
5
4
8
6
3
2
9
1
7
1
7
9
4
8
5
2
6
3
3
6
2
9
1
7
5
4
8
2
1
7
3
5
9
4
8
6
8
3
5
7
4
6
1
9
2
4
9
6
8
2
1
3
7
5
6
2
4
1
7
3
8
5
9
9
8
3
5
6
4
7
2
1
7
5
1
2
9
8
6
3
4