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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.

146763 puzzles downloaded.

                3
        3   6    
        7        
8 3 2     4      
5     1   3     8
      7     4 3 5
        4        
    9   8        
1                
Showing puzzle number: 16
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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