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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.

210566 puzzles downloaded.

  16 7   15       3   11 13   1    
8 11         14 5 16              
        7 13       4 14       2  
12     4 6               9 15 16  
  13   2     6     9   1     4  
6     14         5   16          
  10                       16 11  
5               11     3        
        10     7               9
  12 15                       6  
          8   6         3     1
  8     4   13     12     2   7  
  15 2 5               10 13     4
  6       10 4       1 16        
              14 2 11         8 5
    11   16 5   9       14   10 1  
Showing puzzle number: 138
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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