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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.

256308 puzzles downloaded.

    15   1                 16    
9 2   8                 4     10
4 11 12       5   2       8 13 7  
  1   6   15 2 13         5 12    
    13           11       3   6  
                      13        
14 6     9       12   15 8   7    
      16             1 2 12      
      9 8 2             7      
    2   13 9   6       1     4 5
        16                      
  4   10       5           2    
    7 4         9 15 16   13   5  
  8 9 2       15   1       6 12 16
6     12                 1   3 7
    5                 11   10    
Showing puzzle number: 652
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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