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Sudoku puzzles disjoint groups (Su Doku)

My database includes 41726 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. The cells with the same color must also contain the digits 1 through 8. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

176549 puzzles downloaded.

6   1 7   5    
  3            
  6           4
  4 2          
          4 7  
2           6  
            8  
    4   7 2   1
Showing puzzle number: 21767
Puzzletype: Symmetrical Sudoku
Startnumbers: 18
Difficulty: Super easy (0)
Solution methods: SiSo
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