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Step by step example of solving a sudoku puzzle
Step 30   Let’s look at the top left box (where ABC cross JKL). This is simple sudoku logic. We can’t put a 7 in BK because there’s already a 7 in cell HK. Therefore, the only available cell is BJ.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
Step30: 7   9
6 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 9 7
2 6  
1 5  
8 9  
7   9
  2  
5   4
5 8  
9 3  
2 7  
    5
9 7 8
  1 6
     
3 4  
9 7  
7   9
6   5
8   3



   
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