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Sudoku puzzles disjoint groups (Su Doku)

My database includes 67954 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. 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.

367306 puzzles downloaded.

        7   2   8
  5 3 4          
          9      
1   6            
5       2       1
            5   3
      6          
          4 1 7  
6   7   1        
Showing puzzle number: 27539
Puzzletype: Symmetrical Sudoku
Startnumbers: 21
Difficulty: Very easy (0)
Solution methods: SiSo SC
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