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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.

813294 puzzles downloaded.

3 1           6
      4       1
  8 1          
  3       4 1  
  4 6       5  
          8 3  
2       3      
6           2 8
Showing puzzle number: 67490
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Very hard (0)
Solution methods: SiSo SC SB FI
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