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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.

136703 puzzles downloaded.

    8 3          
          9      
        2 6   4  
              2  
  2   9   7   1  
  8              
  1   5 3        
      1          
          2 1    
Showing puzzle number: 71
Puzzletype: Symmetrical Sudoku
Startnumbers: 18
Difficulty: Medium (0)
Solution methods: SiSo SC SB DS
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