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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.

715610 puzzles downloaded.

3   1   13 15   8   4     5 2  
7       12         9   1     11
          11   12       8 9    
    5   8       7       10    
  15           14 2 6 8 4   11  
9     1         15       6    
    15 7 14 10 1   9   3 2   8  
      4 6           10 13      
  13   10 3   8   5 7 12 9 4    
    9       10         7     13
  2   13 4 5 15 11           3  
    11       13       4   2    
    14 5       9   10          
6     8   12         9       10
  4 10     7   3   8 5   12   15
Showing puzzle number: 3773
Puzzletype: Symmetrical Sudoku
Startnumbers: 86
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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