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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.

402754 puzzles downloaded.

        8        
6 1     4       7
    8 7   2 1 5  
5             9  
    2       7    
  7             1
  5 3 8   7 9    
1       5     7 8
        1        
Showing puzzle number: 28684
Puzzletype: Symmetrical Sudoku
Startnumbers: 26
Difficulty: Very easy (0)
Solution methods: SiSo SC
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