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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

229776 puzzles downloaded.

    10 4           1   3       16
          2 10               15  
7   8 14       1               5
    11 6     9           7   13  
    16       12 14   5   1        
  10 12 1   5                    
  14     4       11 6   16 5   1  
          16     3   14 9 4     12
14     10 1 9   8     3          
  8   2 7   5 16       10     3  
                    9   2 5 10  
        2   4   13 7       6    
  7   13           16     9 14    
2               10       13 7   15
  9               4 13          
10       5   7           6 2    
Showing puzzle number: 18
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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