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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.

  9           7     3   14 11 10  
      15 6         5           13
14   13 16   3 4               5  
      6     13   4         7    
          7     10 2 5         6
15 12         11 10   1   3        
      4 1   8                  
5                           15 1
11 1                           9
                  11   9 16      
        3   1   2 10         14 7
13         15 10 9     1          
    12         14   3     1      
  8               7 12   13 3   2
7           12         11 15      
  16 14 10   5     6           9  
Showing puzzle number: 352
Puzzletype: Symmetrical Sudoku
Startnumbers: 74
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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