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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.

286290 puzzles downloaded.

  7     2   4 8  
    5 7          
                 
3 1       7     8
4               9
9     8       4 7
                 
          1 3    
  2 4   8     1  
Showing puzzle number: 40120
Puzzletype: Symmetrical Sudoku
Startnumbers: 22
Difficulty: Very easy (0)
Solution methods: SiSo SC
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