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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.

        4     5   10 14 12        
      3           7       1    
          15   6 3   13 2   12   5
5 7 16                 1 4      
  14     3       2     7   15    
      6       10 13              
  2   8         9   11     3 4  
16             7         1      
      2         1             14
  15 11     3   8         6   9  
              11 15       10      
    9   6     4       16     11  
      15 11                 5 16 1
11   6   8 9   2 16   3          
    12       10           2      
        15 16 7   11     8        
Showing puzzle number: 89
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Very easy (0)
Solution methods: SiSo SC
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