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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               2         12    
        2         16   6        
    9   1     12         11 5    
          11     3       10 15 6 8
                  10       16    
3         1       4   2 13   15  
    5                     7   10
    7     10         11   9 2 4  
  9 11 12   8         16     1    
1   4                     13    
  15   5 9   1       7         14
    14       3                  
14 7 8 13       2     1          
    2 10         4     8   3    
        12   10         9        
    12         14               9
Showing puzzle number: 312
Puzzletype: Symmetrical Sudoku
Startnumbers: 68
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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