Sudoku Explained
A
B
C
D
E
F
G
H
I
6
1
8
1
2
1
5
6
9
7
2
9
3
1
2
5
9
3
4
9
3
7
1
5
3
6
1
8
4
5
6
6
7
7
3
2
6
5
9
8
8
7
2
9
Box
1
Box
2
Box
3
Box
4
Box
5
Box
6
Box
7
Box
8
Box
9
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Box 5 requires a 1
Rows 4 and 5 contain 1
Column F contains 1
D6 must be 1