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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.

949721 puzzles downloaded.

7 2   9   15   8     1 14 3    
  15 1 10         3   4        
3           11       9     15 12
  8 10 1     13       15        
  12 6 7   10 14 9 2         13  
2       13     15       5      
    8   15 14   2 1         3  
    2   3 8 4   10 13 11   12    
  1         12 11   3 8   9    
      2       10     12       5
  14         1 3 9 11   15 4 8  
        9       5     3 10 14  
14 9     5       11           6
        6   7         2 14 1  
    13 3 2     12   15   9   4 8
Showing puzzle number: 8286
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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