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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.

75244 puzzles downloaded.

      5          
7 1         4    
    2         8  
    5   7   3 6  
        8        
  7 9   1   5    
  2         7    
    7         9 1
          7      
Showing puzzle number: 106
Puzzletype: Symmetrical Sudoku
Startnumbers: 21
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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