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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.

248975 puzzles downloaded.

7       12 13         15   9      
  14   9           1 7     5    
  13           7   2            
    4 3         9 11       16 8  
15 10   12               2   1   5
                               
5     1 15   13         14       16
            6 4   9   5       14
16       2   10   3 5            
3       13         8   12 5     1
                               
6   13   11               3   15 8
  11 14       2 15         1 6    
            12   10           16  
    6     1 7           14   10  
      10   6         1 11       9
Showing puzzle number: 442
Puzzletype: Symmetrical Sudoku
Startnumbers: 72
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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