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Step by step example of solving a level 5 (very hard) sudoku puzzle

Step 50   Let’s look at the upper middle box of the sudoku game (where ABC cross MNO). We can’t put a 9 in cell CO because there’s a 9 in cell CJ on the same row. Therefore, sudoku game rules dictate the number 9 must be in cell AO.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1 8 7
5 4 3
9 2 6
3 4 Step50: 9
6 2 1
8 7  
2   6
8   7
1   4
4 9 1
3 7 2
8 6 5
2 6 8
9 5 4
7 1 3
3 7 5
6 1 8
4 2 9
2 1 8
6 3 9
7 5 4
4 9 7
5 8 2
1 3 6
5 6 3
7 4 1
9 8 2



   
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