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Sudoku puzzles (Su Doku)

My database includes 300320 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 2x4 box contains the digits 1 through 8. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

853225 puzzles downloaded.

6 5       1 3  
    7 8        
  6       5    
      1       4
7       2      
    3       6  
        3 8    
  8 4       7 5
Showing puzzle number: 147840
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Very hard (0)
Solution methods: SiSo SC DC FI
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