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Sudoku puzzles irregular (Su Doku)

My database includes 2782 puzzles for the moment and I'm constantly generating more.

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

For more information check out Wikipedia.

350321 puzzles downloaded.

      6     3  
    2         1
  3   1 2      
  2   5     7  
  5     7   4  
      3 1   2  
1         3    
  4     6      
Showing puzzle number: 643
Puzzletype: Symmetrical Sudoku
Startnumbers: 20
Difficulty: Very hard (0)
Solution methods: SiSo SC SB SF NS FI
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