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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.

280032 puzzles downloaded.

    13 14               3   10    
  1 12 6 3 7     10   16          
    3     4   14 9 7   1        
          13 8     4         14  
    14         6                
  12 10 13 11       1         6 7  
15     2 14 3                   4
3 11 9   5   16             1   12
7   11             6   13   5 3 9
6                   1 2 8     7
  5 8         3       15 1 14 11  
                11         2    
  13         2     16 7          
        15   9 11 13   6     8    
          10   5     14 8 2 16 12  
    4   7               13 15    
Showing puzzle number: 65
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Super easy (0)
Solution methods: SiSo
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