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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.

205668 puzzles downloaded.

3     7   1    
    4         3
        8     2
    8       1  
  6       7    
4     2        
7         4    
    5   1     7
Showing puzzle number: 29573
Puzzletype: Symmetrical Sudoku
Startnumbers: 18
Difficulty: Hard (0)
Solution methods: SiSo SB DS DC
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