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Step by step example of solving a sudoku puzzle
Step 4   Let's look at the box on the upper left side (where ABC cross JKL). We can't put 1s in columns J and K because there are 1s in cells EJ and IK, respectively. Sudoku play rules prohibit using a number twice in the same column. Therefore, the only available cell for a 1 in this box is cell CL.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5   2
    9
6   Step4: 1
  9 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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