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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.

278488 puzzles downloaded.

  8   16       14       4   9    
          4 10   13 8 16 14        
        3     15             2 1
          8     10   1       13  
16   2   7 13         4         9
            15     16   5 4     13
7 5                 3          
    4         10       13   6 14  
  16 9   6       1         11    
          11                 4 10
2     14 1   7     11            
15         12         10 6   14   16
  6       7   2     13          
9 15             5     3        
        9 15 8 3   12 6          
    7   14       11       16   9  
Showing puzzle number: 124
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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