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Sudoku puzzles disjoint groups (Su Doku)

My database includes 67954 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. 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.

296669 puzzles downloaded.

    8         4 7
2 4              
  1   8     5   6
  3              
7               9
              8  
8   4     3   7  
              9 1
3 7         4    
Showing puzzle number: 66546
Puzzletype: Symmetrical Sudoku
Startnumbers: 22
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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