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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.

4         5   6       16 12      
              2 6           13  
      13 3           15   11      
  3       12 13       2     6    
    13         3 16   7     11 6 15
14               8     13     9  
10   1 4   6               13    
2       13   8     15         1  
  9         1     10   14       12
    7               5   4 8   1
  11     7     10               9
3 8 15     13   4 12         7    
    11     7       16 14       3  
      14   11           6 15      
  2           15 9              
      16 8       11   12         7
Showing puzzle number: 281
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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