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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.

402249 puzzles downloaded.

    12 10       5           11 3 15
  6   3   8     10 12 9 2 14     7
10     6 9   3 11   16   7 13 15   1
  14 11   16 5   4   7 1 10 8      
  5     15     10   1 2       8 14
    15 14   2 7   1 13 11 16 10      
3   7   2 14 6 12           10    
    4 9   7   1 3 10     2 16 6  
  16 8 1     14 3 12   10   4 13    
    16           13 14 15 12   5   6
      11 6 15 16 14   4 7   12 9    
6 2       16 4   15     1     5  
      13 8 9 12   14   16 5   2 4  
13   14 4 1   10   16 6   15 9     11
12     15 3 1 13 7     6   5   11  
5 7 13           4       16 3    
Showing puzzle number: 172
Puzzletype: Symmetrical Sudoku
Startnumbers: 132
Difficulty: Very hard (0)
Solution methods: SiSo SC DC SF
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