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

Step 7   Let’s look at the box in the upper middle sudoku grid (where ABC cross MNO). We can’t put 4s in column O because there’s a 4 in cell EO and according to sudoku rules a number cannot be repeated twice in the same column. We can’t put a 4 in cell BN because there’s a 4 in cell BK. Therefore, the only available cell is AN.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1   7
5 4  
    6
3 Step7:
4		  
6    
8 7  
   
     
     
4   1
3  
8  
2 6 8
9 5 4
7 1 3
  5
    8
4  
   
 
 
  9 7
     
  6
5  
4 1
9 2



   
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