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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.

185538 puzzles downloaded.

        3 10   8 14   5 15        
3     8           4       10    
  6     9   15   10 12       16 5 3
10 12       16 1     13            
    11         16             14 1
15                   14     11 16  
8                 11   16        
      16 11 9     8 1            
            2 10     15 5 13      
        6   4                 16
  3 2     8                   12
14 10             4         8    
            16     9 13       7 11
7 14 3       6 1   5   2     15  
    12       9           14     10
        15 11   2 6   12 1        
Showing puzzle number: 418
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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