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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.

4     8         7 6            
14 13     6   15         9        
    15       2       14          
1   12   10         13   16   7    
    11 10   16 13   15 2 6 3 14      
      14 15 4 9   13       11   16  
8           11       16         15
  2                   4   10    
    3   12                   10  
12         10       14           16
  9   7       14   3 4 8 12      
      1 13 15 8 9   12 7   2 6    
    5   3   7         14   13   12
          12       9       16    
        1         4   12     7 2
            10 15         6     14
Showing puzzle number: 371
Puzzletype: Symmetrical Sudoku
Startnumbers: 82
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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