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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.

276711 puzzles downloaded.

16 9 12     14   5 4 8           3
          15 3   5 11         9  
  11       8   4           2    
1     8 11   9     14       6    
    14 9                 6     11
        2               13     5
5 6       10     8   4          
  15                     2 8   12
2   8 12                     11  
          16   7     8       6 13
13     7               3        
9     14                 15 16    
    10       5     3   4 7     16
    1           16   14       13  
  3         14 10   15 13          
8           16 11 6   7     12 4 2
Showing puzzle number: 104
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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