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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.

232259 puzzles downloaded.

      15         10 13       16    
      14   2     12 16 6         13
12     16 13           8 10   3   9
13   4   3 7       5     16   6  
    2   10 11 16 8                
  10         8     6         5 16
        7 15           5   8 13  
9 16 7 13 1         3           11
3           6         13 1 5 10 7
  15 13   5           4 2        
14 8         15     1         2  
                11 7 14 1   9    
  9   3     12       11 15   1   4
1   3   8 6           16 5     2
4         16 9 14     10   3      
    14       3 16         8      
Showing puzzle number: 4
Puzzletype: Symmetrical Sudoku
Startnumbers: 92
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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