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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.

                    4 11     6  
1     14   16         10          
  2       7               16    
        13     11 1   6     14   9
8   10   1   2 3 12 14   5 13 7   16
      4 10   8 5       15   6    
          14         13 2 10      
      13           9       1    
    16       3           11      
      9 11 8         14          
    7   16       6 4   1 3      
14   12 6 2   13 4 11 7   10   5   1
16   13     1   10 7     4        
    9               16       11  
          11         2   7     13
  11     12 3                    
Showing puzzle number: 631
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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