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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.

254293 puzzles downloaded.

      16 10       5 8   11     14 6
      1       4     9          
    11             12   15        
      6 13     15     2     11 1  
  16 4               11 2       9
11                   4 8     16 14
1     9     4         14     7  
      12   14   5       1        
        8       13   12   15      
  11     1         6     7     2
13 9     4 2                   1
7       12 5               3 4  
  6 8     7     11     12 14      
        6   2             16    
          15     9       2      
15 13     5   8 14       16 6      
Showing puzzle number: 602
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Very easy (0)
Solution methods: SiSo SC
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