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

Step 25   Let’s look at the right middle box (where DEP cross PQR). We can’t put 2s in rows D & E, because there are 2s in cells DM and El, respectively. We can’t put a 2 in cell FR because there’s a 2 in cell IR on the same column. The only inevitable sudoku solution is to put a 2 in cell FQ.

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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  
9   6
3 4  
6 2  
8 7  
   
    7
    4
4   1
3 2
8  
2 6 8
9 5 4
7 1 3
3   5
    8
4 Step25: 2
2  
6  
7  
  9 7
5 8 2
3 6
5 6 3
7 4 1
9 8 2



   
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