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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.

11 9 2   15     7         13      
13 6   14   9     4 11       10   12
      4                 3 15    
  7 12       14 4               16
                  14   16   5    
    7 5   14       1 3 9   16    
    16     12   15 13   8     6    
      8           10       14   3
9   4       5           16      
    11     13   3 16   9     12    
    10   11 8 6       13   1 9    
    15   16   7                  
5               3 13       2 16  
    14 10                 5      
6   9       2 14     5   12   15 10
      7         10     2   13 1 14
Showing puzzle number: 64
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Very easy (0)
Solution methods: SiSo SC
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