Today's Dragon Tip
To change the tentative impossibilities (numbers that can not go in a square) just press CTRL and the number you want to remove from the current square. To clear all tentative possibilities and impossibilities from the current square press the F7 key.
Puzzle Contribution [Page 12 of 15])
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To contribute a puzzle all you need to do is select Contribute from Sudoku Dragon puzzle solver's File menu.
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