Langer's Sudoku Assistant

Invalid Sudoku!

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

 

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

 

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