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.

 

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

 

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