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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.

161745 puzzles downloaded.

6     1   7      
  5     8        
      5     9    
  7       5   8  
                 
  6   4       2  
    6     2      
        9     7  
      6   4     1
Showing puzzle number: 81
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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