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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.

              16     10 8   15 4  
    1       10     11 14 6        
9       6 14     5 2   3 10      
6 10 14     8         4          
  8           1     2   15 5    
7 14           4                
12     1                     9  
      16     12 11     8   7   2  
  16   6   13     12 9     14      
  9                     1     16
                1           5 11
    15 3   11     8           13  
          7         16     12 8 15
      11 15   4 8     13 12       9
        3 10 14     8       16    
  4 7   11 12     15              
Showing puzzle number: 494
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Very easy (0)
Solution methods: SiSo SC
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