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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.

234842 puzzles downloaded.

          15 14     10 7 16        
  7 14     2   12 9       10 6 13  
16       9   1   12   14 5        
        7     10     13   15   14 16
      7       15       3        
  13 11     8         15          
      14       9 10         15 8 13
      3       5   2 9 8        
        6 3 13   15       16      
3 14 2         7 13       5      
          11         2     1 15  
        1       16       3      
11 8   2   16     14     13        
        14 10   13   9   15       2
  5 7 10       3 1   6     14 11  
        11 6 4     8 12          
Showing puzzle number: 523
Puzzletype: Symmetrical Sudoku
Startnumbers: 86
Difficulty: Super easy (0)
Solution methods: SiSo
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