Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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