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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.

        8             13        
      15 3 9     11   8 10        
    3 9             4   8 1    
          13 2               4  
2     7 14 6                   1
14             11 8         7   2
3             7 14 5 9       8  
    9 5         2 3     14 15 6 13
4 14 13 3     6 2         1 10    
  5       14 15 9 4             7
15   1         12 10             6
11                   7 6 3     12
  13               12 2          
    2 14   16             13 4    
        9 4   13     15 16 7      
        1             9        
Showing puzzle number: 353
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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