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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.

399559 puzzles downloaded.

12 11 1 3   4   9 16 15   5 7 2   6
16 2 13       10 12 4       8     3
5   14 9 4 11     2 8 12       7  
  7   16   14 5 10 6           12 11
    12 2         8 16 13 7   1 10  
1               7 3 16   5 15    
3 9 6 7   15 12 11     14          
9 16     15   14   1   7 13 10 11   8
7   2 8 6 9   5   13   12     11 16
          13     9 1 11   6 4 2 5
    15 11   7 16 8               4
  10 9   8 5 6 4         12 13    
11 1           3 14 12 9   2   13  
  13       6 11 7     2 9 3 14   1
6     10       1 15 11       16 9 14
10   8 13 12   1 14 3   5   11 9 16 7
Showing puzzle number: 12
Puzzletype: Symmetrical Sudoku
Startnumbers: 138
Difficulty: Hard (0)
Solution methods: SiSo SC DC
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