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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.

312742 puzzles downloaded.

                 
  1   3 6 8 5    
  3     1     2  
    7         1 3
                 
1 9         4    
  6     5     8  
    4 6 3 9   7  
                 
Showing puzzle number: 3972
Puzzletype: Symmetrical Sudoku
Startnumbers: 22
Difficulty: Medium (0)
Solution methods: SiSo SC SB DS
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