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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.

    3   12     1 11 15     8     4
12             7       13   1   5
        3     13       5     15  
16           8       6       3  
            4 14   2            
13           10 11     8         15
  4     16 8     9   5 10        
  14       12     6         4 1 3
2 1 12         5     11       13  
        6 16   8     9 1     11  
7         10     2 6           8
            7   12 10            
  9       14       13           16
  15     8       5     6        
11   7   15       8             1
3     5     2 10 1     11   6    
Showing puzzle number: 277
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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