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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.

239178 puzzles downloaded.

              13     4 15 5   6  
        16 8 11         13        
16   6   15   10             2   4
  9     2           7   3 14    
6 1       15       13   8 11   3  
11   3   13 10         16     6    
      16 14             1        
      2     8     11            
            13     4     2      
        8             10 7      
    14     16         11 7   3   9
  8   11 9   14       2       15 6
    2 10   12           4     7  
12   7             1   2   4   11
        10         14 3 11        
  4   14 11 2     12              
Showing puzzle number: 355
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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