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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.

402754 puzzles downloaded.

5 9           3  
2   4     7     8
1       9   2   6
    1     3      
9               1
      9     7    
7   8   6       9
4     7     8   3
  1           5 7
Showing puzzle number: 52909
Puzzletype: Symmetrical Sudoku
Startnumbers: 28
Difficulty: Super easy (0)
Solution methods: SiSo
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