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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.

316312 puzzles downloaded.

    7   1     5  
1     3     9    
                 
  6 2   8     9  
                 
  5     9   8 3  
                 
    1     5     7
  4     2   5    
Showing puzzle number: 4253
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Super easy (0)
Solution methods: SiSo
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