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Sudoku puzzles irregular and disjoint groups (Su Doku)

My database includes 3788 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 6. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

129186 puzzles downloaded.

4   6     1
           
  2 5      
      4 2  
           
2     6   5
Showing puzzle number: 690
Puzzletype: Symmetrical Sudoku
Startnumbers: 10
Difficulty: Very hard (0)
Solution methods: SiSo SC SB FI
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