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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.

                1 2 4       8  
    8                 10 14     12
  10     4   16           3      
  2   9     1 10   3 14          
  7 14           8   1 3       4
  13   8 2 11         16 14 6      
            14 4       12 15 2    
    10                   13 16    
    2 1                   4    
    7 16 11       5 10            
      10 9 13         11 16 5   12  
12       14 10   1           8 11  
          16 7   6 9     4   15  
      4           7   1     6  
8     7 6                 11    
  12       15 4 3                
Showing puzzle number: 614
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Very easy (0)
Solution methods: SiSo SC
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