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Sudoku puzzles (Su Doku)

My database includes 6913752 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. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

135487198 puzzles downloaded.

    3     4     8
  7 8 3     6    
6   5     2   4  
        1        
    7   8     9  
  8   9     7    
      5 4       1
              8  
9               4
Showing puzzle number: 3686517
Puzzletype: Optimal Sudoku
Startnumbers: 24
Difficulty: Super hard (9)
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