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Sudoku puzzles irregular and disjoint groups (Su Doku)

My database includes 131 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 6. The cells with the same color must also contain the digits 1 through 9. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

161745 puzzles downloaded.

4             5  
1   3     8      
    5   3 7      
          1      
3       9       2
      5          
      3 1   6    
      6     4   1
  5             9
Showing puzzle number: 28
Puzzletype: Symmetrical Sudoku
Startnumbers: 21
Difficulty: Very easy (0)
Solution methods: SiSo SC
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