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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.

243531 puzzles downloaded.

    10   11 6 2 7       14        
            14 12 13 9 6          
  13   6 9 4   10       15   2    
16   2 14     8   10 4 3   1      
    16           14         15    
    9 1               10 12   11  
              4 12 3 5   14 6    
              1       7 8      
      12 13       5              
    8 9   14 4 3 11              
  1   7 8               11 5    
    15         9           3    
      10   3 6 2   13     9 8   11
    13   14       1   2 6 5   3  
          7 10 13 16 8            
        4       3 15 11 12   14    
Showing puzzle number: 19
Puzzletype: Symmetrical Sudoku
Startnumbers: 86
Difficulty: Super easy (0)
Solution methods: SiSo
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