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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.

  4   2     1   7
  3              
1       3        
      6          
  7 4   9   6 5  
          4      
        5       3
              6  
6   9     7   8  
Showing puzzle number: 44075
Puzzletype: Symmetrical Sudoku
Startnumbers: 21
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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