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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.

          14 9 2         16     8
    5       12 6     2   9   4 7
          11       1            
  1           10   16   14 13      
15 5   7   8   14     4       16  
14 13                   3 2      
    12                     3 15  
    8   15   5 11     6   1 4 10 9
4 2 14 9   12     8 15   16   11    
  6 13                     12    
      1 11                   9 16
  11       15     7   14   5   1 3
      6 7   8   11           13  
            10       3          
3 12   4   2     1 7       16    
9     8         6 14 13          
Showing puzzle number: 70
Puzzletype: Symmetrical Sudoku
Startnumbers: 84
Difficulty: Super easy (0)
Solution methods: SiSo
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