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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.

188515 puzzles downloaded.

  2       13     12 3     15 10   4
3   7 9     8 1       11        
          12 2                 16
                        1     6
6 1       9             4   10 11
    12               4          
      13 2 16   4                
2 15     11   14 8       10       1
9       16       14 15   3     4 13
                7   9 16 12      
          2               1    
7 13   16             5       8 15
5     6                        
4                 9 10          
        6       1 4     7 15   14
12   15 11     3 7     2       16  
Showing puzzle number: 593
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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