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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.

        2   6       14   7     10
6 7   3 8           15          
                  5            
2 13     12     14       10        
3 2       12 10                  
  5   6     2   3 4 10   14 12    
    4       11     8   2   1    
13 10     1     6       12   8   16
11   15   16       14     9     12 2
    6   7   9     10       16    
    7 10   2 8 15   6     9   5  
                  2 12       7 1
        6       4     14     9 8
            13                  
          11           16 5   15 4
14     13   9       12   8        
Showing puzzle number: 590
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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