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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.

400211 puzzles downloaded.

  2           6 3
  1   3          
      8 2     1  
              7  
    3   5   2    
  7              
  9     1 2      
          9   3  
1 5           8  
Showing puzzle number: 18608
Puzzletype: Symmetrical Sudoku
Startnumbers: 21
Difficulty: Very easy (0)
Solution methods: SiSo SC
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