Langer's Sudoku Assistant

Invalid Sudoku!

Row 2 is invalid. Column 6 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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