Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 4 is invalid. The middle center 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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