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

Step 12   This is another very hard solution. It takes a lot of brain power and sudoku logic. Again we resort to the process of elimination. Let’s look at cell IJ. We can eliminate numbers 1, 5, 4, 3, and 8 because there are already showing in column J. We can eliminate numbers 3, 6, 9 and 2 because they are already showing in row I. Therefore, the only number remaining is 7. This is a classic “finding by eliminating” sudoku move.

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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 4  
6 2  
8 7  
   
     
    4
4   1
3  
8  
2 6 8
9 5 4
7 1 3
  5
    8
4  
   
 
Step12: 7  
  9 7
5   2
  6
5  
4 1
9 2



   
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