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Sudoku puzzles irregular (Su Doku)

My database includes 15 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

219581 puzzles downloaded.

    9   11 5       6 10 8       7
        4     1   12 13 15   14    
  12       2   3 8             16
7   3   14   15           5 12    
4     13   16 7           14      
8 10 14           4   11       5 12
      16                 7 11    
5   16         9     7       1  
  7       1     14         3   5
    13 5                 12      
6 8       15   13           10 11 2
      4           10 9   11     3
    2 7           16   3   4   1
3             16 6   12       15  
    6   8 3 2   11     12        
12       5 6 13       2 4   8    
Showing puzzle number: 11
Puzzletype: Symmetrical Sudoku
Startnumbers: 88
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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