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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.

129560427 puzzles downloaded.

        8 7   4  
  1              
      5   6 2    
        9 2 8    
7   2   6       3
  9             6
      3       1  
      2     4 8  
  4         5    
Showing puzzle number: 3484073
Puzzletype: Optimal Sudoku
Startnumbers: 23
Difficulty: Super hard (162)
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