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Sudoku puzzles (Su Doku)

My database includes 12449 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x5 box contains the digits 1 through 15. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

    15           14 12 11     8 1
11     2   15   7   6   4 14 3  
13     14 3 8 11       10 7   15 6
            1   9     13   2  
    5   2     3   11 4        
      12 4   7       3   6 10  
3 12     6       8     5 1 7  
              5              
  5 7 10     2       6     14 3
  14 4   9       3   7 6      
        7 9   8     14   10    
  15   8     14   13            
1 3   4 12       2 7 5 10     8
  9 11 5   10   6   15   3     14
14 8     15 3 13           9    
Showing puzzle number: 12423
Puzzletype: Symmetrical Sudoku
Startnumbers: 91
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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