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Step by step example of solving a sudoku puzzle
Step 2   Let's look at the box below (where DEF cross PQR). We can't put a 7 in column R (cells DR, ER, and FR) because there's a 7 on cell CR. Remember the Sudoku game plan – Each column must contain the numbers 1 to 9, which means you can’t repeat a number twice in the same column. We can't put a 7 in cell DP because there's a 7 on the same row on cell DM. Therefore, the only available cell for a 7 in this box is cell FQ.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6    
  9  
4   6
     
3    
  5  
  9 7
2 6  
1    
     
7    
  2  
5   4
  8  
9 3  
2 Step2: 7  
    5
    8
  1  
     
3 4  
  7  
    9
     
8    



   
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