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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.

2     10                 4    
1   3     2   5 9 8   14 12    
  8   7 12         10   9     2
10         5 8   13 3 1        
    8   13     6 10 11   3   2  
6 1     3     7   2   13 11 8  
            11     4   8 6 14 7
        6   12   3   4        
9 10 4 8   7     14            
  4 5 13   9   8     11     3 1
  6   3   11 2 10     12   7    
        10 3 4   5 7         9
11     15   6         7 12   9  
    10 2   1 5 12   14     15   4
    12                 1     11
Showing puzzle number: 4786
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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