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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.

206690 puzzles downloaded.

          6    
  8   7       3
               
    1 4 6 3   5
3   8 2 4 1    
               
2       8   6  
    4          
Showing puzzle number: 15844
Puzzletype: Symmetrical Sudoku
Startnumbers: 18
Difficulty: Very easy (0)
Solution methods: SC
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