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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.

295480 puzzles downloaded.

3     4 1       8
              7 5
  9     8        
8 7         9    
      5   9      
    6         1 2
        3     2  
6 3              
4       5 8     9
Showing puzzle number: 12509
Puzzletype: Symmetrical Sudoku
Startnumbers: 24
Difficulty: Super easy (0)
Solution methods: SiSo
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