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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.

                3 15     2   10  
    11                 16 6   15 14
              2 7     5 16 12    
    2             12     13     7
7           6 13   16       4   10
  14     15     4     9          
          8 7   14     11       16
  2 3           6     4       15
11       13     7           14 16  
5       4     3   2 16          
          16     9     12     4  
3   16       11   4 1           12
1     3     9             10    
    13 8 7     5 2              
6 5   9 1                 15    
  11   14     15 6                
Showing puzzle number: 227
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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