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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.

218453 puzzles downloaded.

              8 7 12     16 13 6 14
    13 1           4   2 11   3  
  12 14               5 15       8
16 9   4 1               10      
    12           8     7        
10   8 9 13                 6 4 7
                5              
7 11   15               10 14     2
3     11 10               6   13 1
              11                
13 14 16                 6 15 10   4
        3     5           14    
      2               13 5   14 15
5       15 3               9 7  
  13   14 6   2           4 3    
11 3 1 6     14 9 15              
Showing puzzle number: 283
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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