I first learned of Sudoku from the Windows Vista Sidebar gadget, but was frustrated many times. I found out later that some puzzle layouts were not valid because there were mulitple solutions and apparently a proper Sudoku puzzle's initial number placements should only result in one solution. With Sudoklue Pro I now test various websites that offer free Sudoku puzzles online to see if they are valid. I bought the Pro version over a year ago and it was well worth it. Plus it was being updated and improved without me having to bug the developer.
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http://www.sudoklue.com/m4/
Wednesday, November 4, 2009
Learn Sudoku and avoid frustration
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