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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.

  6           7     13   1   9  
13   10   4           12       11  
    11     6     2           13 12
        5       11     6       8
7 10         2   5 13   8        
            4   9     10   5   14
11       7     10   12 1   13      
      9   11             8 10    
    7 16             14   6      
      6   4 3   10     12       7
8   14   9     15   2            
        14   7 11   3         1 16
3       11     12       13        
5 16           8     2     1    
  14       13           16   7   11
  9   15   5     3           16  
Showing puzzle number: 608
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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