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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 8     2           3   15 7   9
    2     16 3       5       8  
      7 14     15 8       16 10    
  12 6   7       9 11   13   14    
      15 10     8   2         5 1
                      1 7 11    
          2       14   8 10   16  
  6   16 11   1       13          
    9 3 16                      
14 4         6   16     7 13      
    15   13   5 14       3   4 7  
    7 14       1 10     9 8      
  5       10       16 14     1    
10   12 11   9           6     14 13
                               
Showing puzzle number: 245
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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