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Sudoku puzzles irregular and disjoint groups (Su Doku)

My database includes 131 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 6. The cells with the same color must also contain the digits 1 through 9. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

102841 puzzles downloaded.

        3        
                 
    6 8          
6           5 4  
    7 3   5 1    
  9 1           2
          7 3    
                 
        8        
Showing puzzle number: 40
Puzzletype: Symmetrical Sudoku
Startnumbers: 16
Difficulty: Very easy (0)
Solution methods: SiSo SC
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