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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.

280517 puzzles downloaded.

5       7   6   13 12   16     9  
  15     13   4         6   5   7
                  4       12   14
14       12 11   3 9 2     10   15  
  5 12   4   3 7   9   15       13
    3     2         13          
    10     8             4      
        16       8              
              4       2        
      8             12     11    
          3         9     14    
13       1   9   4 16   14   8 10  
  2   14     13 9 10   16 5       11
6   15       10                  
10   4   14         13   8     7  
  3     6   8 16   15   12       10
Showing puzzle number: 556
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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