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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.

292249 puzzles downloaded.

      1 16 2 10 8 11 15   3 4 5   6
7 6     9 16   13     10       2 15
10 11   8   1   3 9         4 12  
  2 5 3       6 8 9   14 15   10 12
  4 2   10       1 11       8 9  
14       11 13   9   6 15       3 2
5 8   13 14 4   15   10     12 16    
    16   5   6         8 2 12    
    11 7 4         5   12   15    
    7 9     1   10   4 13 8   15 11
3 16       7 9   13   12 1       8
  1 10       13 16       15   7 6  
8 9   15 1   2 10 7       3 13 16  
  15 8         5 3   6   16   7 10
1 5       15     2   7 10     13 14
16   13 11 7   15 14 5 4 8 6 9      
Showing puzzle number: 1691
Puzzletype: Symmetrical Sudoku
Startnumbers: 134
Difficulty: Harder (0)
Solution methods: SiSo SC DC XW
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