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Sudoku puzzles (Su Doku)

My database includes 2967 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row and every column contains the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

383356 puzzles downloaded.

8 3       11 16 7 4 2 15 1 5   14 9
10 5 3   7   13   6   4         2
4   14         6 11   3 7        
7   4 15 11 5 1 3 2 12         6 14
  14   13 16 10   2   8     12 5 15  
      3     15 5   16 12 4     1  
2   1   10 14   11   6   13     9  
  6   10 4 2 5   16         15    
    15         12   7 14 16 10   11  
  9     12   7   14   1 3   10   16
  1     9 13 12   5 14     3      
  13 16 9     8   3   6 14 11   4  
6 16         10 13 9 1 5 11 2 7   12
        13 8   16 15         6   11
16         7   1   4   9   14 12 6
13 12   11 14 6 3 4 10 15 16       7 1
Showing puzzle number: 1991
Puzzletype: Symmetrical Sudoku
Startnumbers: 136
Difficulty: Harder (0)
Solution methods: SiSo SC DC XW
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