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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.

5                 1   12       9
                2 6 5 9     3  
  1 9   8   11   3             14
2     6 7       4         13 12  
  12 14 5   2                    
  9     13             1       16
        14 9   1   3     7      
        15           9     5    
    3     8           10        
      13     10   12   8 14        
11       1             2     8  
                    6   12 11 2  
  5 10         2       4 16     1
14             11   8   5   3 9  
  16     5 13 1 12                
9       16   8                 13
Showing puzzle number: 607
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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