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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.

135943046 puzzles downloaded.

    4     2 3    
        3       7
  5       8      
5     6         3
    7       6 9  
    3   7   4    
        1        
1     3 2   7    
4 7   5 9   1    
Showing puzzle number: 4364222
Puzzletype: Optimal Sudoku
Startnumbers: 26
Difficulty: Super hard (148)
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