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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.

143910 puzzles downloaded.

  8   9     4    
  1 9         3  
        6        
        9   8    
      5   8      
    4   1        
        2        
  2         3 9  
    8     6   2  
Showing puzzle number: 67
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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