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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.

118243 puzzles downloaded.

      9   8      
    9 2 4     7  
  2 4     7      
        7        
                 
        9        
      7     5 1  
  5     2 4 3    
      3   1      
Showing puzzle number: 4
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Hard (0)
Solution methods: SiSo SC SB DS DC
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