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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.

  14     5     4   11   13        
1         2 16       3 15        
        9     13       10        
  13   4     6         9   14   16
  7                 16 11   3    
  10   12   1   6 9     5   16 15  
      9     11   12       6      
                    8 14     5  
  5     10 6                    
      2       8   3     16      
  4 9   1     11 10   14   3   6  
    14   15 4                 10  
2   1   3         13     8   9  
        6       8     3        
        13 14       12 15         7
        12   4   5     6     1  
Showing puzzle number: 156
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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