Langer's Sudoku Assistant

Invalid Sudoku!

Column 7 is invalid. The middle right 3x3 Box is invalid. Go back and make a different choice.

 

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

 

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