Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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