Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 2 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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