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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.

278803 puzzles downloaded.

3 10     2                     9
          9     1   8 4 3   13 10
  15 13     5           12     14  
        16     15           12    
  14 3     6 13 10   8   11 1      
12     1   4     14 10       13    
    2 10             7     14    
      16       3           8    
    7           12       13      
    12     8             16 1    
    8       6 7     16   12     14
      11 12   16   8 15 3     5 2  
    9           11     1        
  12     13           6     3 10  
16 8   6 4 12   11     5          
14                     10     12 8
Showing puzzle number: 379
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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