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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.

    13 10   6 16 8 11 3       4    
          9   3         14      
5 3       11 14   9   1       12  
  6   7         16   15   2     10
        13       4     6 5   10  
  8     1     4       10        
  12 10                   4      
      3           12   9 1     11
16     13 3   5           7      
      5                   2 11  
        6       3     12     16  
  15   2 9     1       16        
10     11   13   12         6   15  
  4       3   2   14 10       7 8
      8         12   3          
    16       8 5 6 2 9   3 10    
Showing puzzle number: 244
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Very easy (0)
Solution methods: SiSo SC
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