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Step by step example of solving a sudoku puzzle
Step 3   Let's look at the box in up in the middle of the sudoku table (where ABC cross MNO). We can't put a 7 in row C because there's a 7 in the same row on cell CR. We can't put a 7 in columns M and N, because there are 7s in cells DM and IN. Therefore the only available cell for a 7 in this box is cell AO.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6    
  9 Step3: 7
4   6
     
3    
  5  
  9 7
2 6  
1    
     
7    
  2  
5   4
  8  
9 3  
2 7  
    5
    8
  1  
     
3 4  
  7  
    9
     
8    



   
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