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

Step 22   Let’s look at column N again. There’s only one empty cell left now and there’s only one number missing: number 3. This is the reward for your hard work because the solution is obvious.

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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  
8  
2 6 8
9 5 4
7 1 3
  5
    8
4  
2  
6  
7  
  9 7
5 8 2
Step22: 3 6
5 6 3
7 4 1
9 8 2



   
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