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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.

664922 puzzles downloaded.

      4       15   3          
9 10               8 12   1    
  11 14     1 7   4         9  
  7 15     11 13       8   3   9
    4             1 7 10 11 5  
  8     11 5 3   7 6 4       13
5 9       3     11     13 2 4 6
  4 10         1         7 14  
14 1 13 2     15     12       8 11
4       1 7 2   12 13 14     11  
  6 12 10 9 4             5    
3   7   13       9 10     4 1  
  12         14   8 7     13 6  
    11   3 12               10 8
          15   9       2      
Showing puzzle number: 511
Puzzletype: Symmetrical Sudoku
Startnumbers: 91
Difficulty: Harder (0)
Solution methods: SiSo SC SB DC XW
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