Langer's Sudoku Assistant

Invalid Sudoku!

Row 6 is invalid. Column 1 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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