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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.

178152 puzzles downloaded.

            5         15 1      
            14     1 5       9  
    2 13 11 15     8 16       6    
8         13 3       14 10       4
        14         5 13     7    
      7   6     9   1 11   13   16
        10         2         14  
5     11 2   7   14         3    
    7         6   13   5 4     2
  10         13         8        
12   16   9 7   11     4   14      
    6     12 16         7        
13       12 9       15 16         11
    8       11 5     7 13 15 12    
  3       8 10     9            
      12 13         6            
Showing puzzle number: 638
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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