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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.

243854 puzzles downloaded.

    10     2   4                
  3       13 12                  
8 2 7       10   9 5 12   4     15
  11           5         8      
6     3           8            
    8       14   7 16            
    9 16       8     15 5 7     3
  1   11       3   2 13 12 16 6    
    5 13 14 6 7   12       10   3  
11     2 16 10     3       14 12    
            4 12   10       16    
            8           11     4
      7         8           4  
4     8   5 15 11   9       14 13 7
                  13 2       1  
                14   1     8    
Showing puzzle number: 565
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Very easy (0)
Solution methods: SiSo SC
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