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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.

280517 puzzles downloaded.

    11 4     15   5         13    
  12           5 1 9            
3       16                     1
            3     4     15 9 11 10
                  14            
    5 13   15 6   4     11 9 8 1  
14       4         13   6 7 16    
    9 3 10     14   1   7        
        12   8   2     14 13 15    
    15 7 11   4         16       8
  1 3 16 9     13   15 6   2 12    
            1                  
10 11 7 1     12     5            
2                     1       9
            10 3 13           16  
    6         1   16     8 10    
Showing puzzle number: 115
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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