Langer's Sudoku Assistant

Invalid Sudoku!

Row 4 is invalid. Column 1 is invalid. The middle left 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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