Langer's Sudoku Assistant

Invalid Sudoku!

Column 3 is invalid. Go back and make a different choice.

 

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

 

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