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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.

182507 puzzles downloaded.

12     11   1   14 6     3       7
    6   5   3               2  
  13     12   16       8   1   4  
5     1   10               8   15
        1     12     5          
      5   13       4           2
6 2     11 15               5    
    1 4                 15   3  
  5   2                 16 15    
    11               4 15     10 3
9           6       3   7      
          4     9     14        
15   13               10   3     5
  1   14   7       3   9     16  
  7               8   4   14    
11       16     6 2   14   13     9
Showing puzzle number: 193
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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