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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           2   10 13     6   12
      2         7   1     15   4
      6   7   11     14   13 16    
        14   5 12       15   11    
        2         4   9 5      
3       11                 2    
  2               6       14    
    1   7 10 14       12          
          11       8 9 5   13    
    14       6               12  
    7                 16       9
      1 13   2         11        
    6   10       13 7   14        
    3 8   6     5   16   10      
5   16     4   7         6      
12   9     14 3   10           13  
Showing puzzle number: 463
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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