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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.

683556 puzzles downloaded.

    6 7   12         9   2 11  
        15   5     3   4 14    
1 9 11             6   15   5  
  5 10   8   13   7     6     11
4 15     13     6 12 9 5   8    
  3 14     10       11       9  
      4 9     10 15   13     6 2
    8       2   13       5    
14 13     2   8 11     4 10      
  14       3       15     10 13  
    3   1 4 12 9     6     2 14
2     9     11   5   3   15 8  
  2   8   5             4 15 7
    1 12   15     11   2        
  4 15   11         10   9 13    
Showing puzzle number: 10478
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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