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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.

688919 puzzles downloaded.

    4 5   6 15         1 14   8
3     11   7   12       2      
9     14 6 3 5       11   12 7  
2     13   5     7 3          
5 10         4 8     12   1    
    12         11 14   13   2    
  11   7 5   6 2              
  6   12 13   1 5 4   7 9   3  
              7 12   4 5   6  
    11   9   7 1         8    
    1   2     3 8         10 14
          11 14     2   7     13
  9 6   12       11 4 2 15     5
      15       9   7   14     1
1   7 2         5 15   6 3    
Showing puzzle number: 3422
Puzzletype: Symmetrical Sudoku
Startnumbers: 91
Difficulty: Very hard (0)
Solution methods: SiSo SC SB DC SF
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