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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.

231339 puzzles downloaded.

15 14   6   3   10   12 2          
9   4     5         3   16      
6   8     2         14         13
  3         5 16   1   8     11  
        4     8 16         6 2  
    2     16                   11
    6   7       12 2   10 15   16 9
3             15       2 14      
      9 12       8             10
12 13   11 5   7 3       1   4    
7                   16     13    
  9 12         14 1     15        
  5     15   10   14 7         3  
14         12         15     3   16
      16   11         6     9   7
          13 16   6   12   7   10 4
Showing puzzle number: 13
Puzzletype: Symmetrical Sudoku
Startnumbers: 86
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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