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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.

151450 puzzles downloaded.

  3              
  7       6 4   8
    4 2 3        
      6          
                 
          7      
        7 4 2    
5   3 1       4  
              9  
Showing puzzle number: 54
Puzzletype: Symmetrical Sudoku
Startnumbers: 18
Difficulty: Very easy (0)
Solution methods: SiSo SC
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