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

Step 1   Let's look at the box in the center of the sudoku grid (where DEF cross MNO). We can't put a 7 in column N because there's a 7 on cell CN, and we can't put a 7 in cell DO because there's a 7 on cell GO.  Therefore, we left with one option only: cell FM.

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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    
     
8 7  
   
     
     
    1
3  
8  
2  
9 5 4
step1:
7
  3
  5
    8
4  
   
 
 
  9 7
     
  6
5  
4 1
9 2



   
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