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

Step 36   Again, this step is the reward for your sudoku logic and hard work: Only one blank cell and only one number missing. Let’s look at the bottom left box (where GHI cross JKL). Remember, according to suodku’s rules, every box must have all number from 1 through 9. This leads to sudoku’s inevitability: the number 9 must be in cell HL.

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J K L M N O P Q R
A
B
C
D
E
F
G
H
I
1 8 7
5 4 3
9 2 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 2
2 1 8
6 3 Step 36: 9
7 5 4
4 9 7
5 8 2
1 3 6
5 6 3
7 4 1
9 8 2



   
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