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Step by step example of solving a sudoku puzzle

Step 17   This step is a bit more complicated. The logic to solve this step would demonstrate to you why the sudoku game has become so popular and why so many people play sudoku on a daily basis. Let’s first look at the middle box (where DEF cross MNO). We can’t put 3s in row E because there’s a 3 in cell EQ, so we know that there must be a 3 in either cell DN or FN in column N. Now, let’s look at the top middle box (where ABC cross MNO). We can’t put a 3 in column N because we know there’s already a 3 in this column following our previous logic.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
    9
6   1
1 9 7
4   6
    Step17: 3
3 6 8
1 5 2
4 9 7
2 6  
1 5  
     
7   9
  2  
5   4
  8  
9 3  
2 7  
    5
    8
  1 6
     
3 4  
9 7  
    9
     
8   3



   
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