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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.

      3     16         1 11 15 8  
        15   6   3   9         10
  9 15     3   2   14   10 5      
  14 5     8   10       11   9    
12 1   9 16   10   6     2     15  
    8 15   2       9 1         4
  10 14     15                    
        3                      
                      13        
                    4     11 10  
7         6 1       5   8 13    
  15     8     13   1   6 4   12 14
    6   13       1   2     5 9  
      8 7   15   11   13     10 3  
15         1   3   7   5        
  13 7 1 9         3     14      
Showing puzzle number: 364
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Very easy (0)
Solution methods: SiSo SC
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