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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.

120878 puzzles downloaded.

8     1         4
          6      
    3 5          
4                
  7           1  
                7
          2 5    
      6          
1         8     6
Showing puzzle number: 76
Puzzletype: Symmetrical Sudoku
Startnumbers: 16
Difficulty: Hard (0)
Solution methods: SiSo SC SB DS DC
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