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Sudoku puzzles diagonals (Su Doku)

My database includes 5816 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The diagonals must also contain 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

778318 puzzles downloaded.

              16 12 4 1 15   13   8
9                 13   3       4
  16 13           7   5   10   14  
  12 5 11           10 16         6
13 1     10   14                  
    11     4     1   2 12       15
6         11   5 16     13   9 1  
            7     14   6 11 10 8  
  8 16 3 1   11     7            
  6 14   5     12 10   11         9
12       15 13   7     14     11    
                  1   9     5 7
11         16 4           5 3 7  
  3   6   1   11           15 2  
1       8   10                 14
10   12   7 5 6 14 9              
Showing puzzle number: 646
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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