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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.

  10 9 5   3       16            
          9 16 15 6     8     4  
  11 16         1         12     8
    8 15             11 4 6 16    
9                             11
      11     1 5       14   10   12
  14     16     11   6   15 3      
  6     10         12            
            8         6     16  
      9 7   15   3     13     11  
4   3   2       7 10     5      
7                             9
    11 7 1 4             16 8    
8     6         1         12 3  
  13     15     16 8 5 4          
            10       13   9 7 5  
Showing puzzle number: 500
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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