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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.

    6     12                    
              5 15 13   9        
  3   14   8 7     16       10 6  
  8 10     9   16         13 1    
    8     10 9     11 16          
4 9 13     14     10   8   3      
2     6   7       1   3 12      
16       5             6 1 7 9  
  13 5 7 4             8       9
      8 7   11       4   16     3
      1   15   8     5     13 12 7
          5 12     10 13     2    
    14 4         1   15     6 11  
  15 3       6     12 9   5   14  
        8   10 15 11              
                    7     15    
Showing puzzle number: 378
Puzzletype: Symmetrical Sudoku
Startnumbers: 86
Difficulty: Super easy (0)
Solution methods: SiSo
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