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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.

246067 puzzles downloaded.

      15 10       14     7 12   6  
          13       9     10 15    
  11     6 14 15     3     16      
14     6     9   16       3 8    
  15                           10
9 7             2   10 13       14
1   13   8 4       5     2   12 9
  12     11 10                    
                    1 5     16  
7 5   16     1       2 11   14   3
11       5 15   4             2 6
4                           8  
    11 14       3   1     6     2
      9     12     10 13 2     4  
    4 1     5       6          
  6   2 13     11       4 1      
Showing puzzle number: 116
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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