Langer's Sudoku Assistant

Invalid Sudoku!

Column 4 is invalid. Go back and make a different choice.

 

5
9
2
      3
      6
       
      3
      6
       
8
7
1
4
4
3
7
1
5
9
2
6
8
8
6
1
7
4
2
9
3
5
4
8
7
3
5
1
   2   
      6
       
   2   
      6
       
9
6
9
1
7
4
2
8
1  2  3
4  5  6
7  8  9
3
2
5
3
6
9
8
1
7
4
1  2   
      6
       
   2   
      6
       
1      
      6
       
9
4
3
8
7
5
3
7
5
2
8
6
9
1
4
4
8
9
5
1
7
3
2
6

 

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