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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.

        7     4 1
    7   8     9  
  2       3      
  7   8 9 4     5
5                
  6 1     5     8
  1           6  
        5       2
    3 6     5   9
Showing puzzle number: 2354794
Puzzletype: Optimal Sudoku
Startnumbers: 26
Difficulty: Super hard (299)
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