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According to Nature, International Journal of Science, "An Irish mathematician has used a complex algorithm and millions of hours of supercomputing time to solve an important open problem in the mathematics of Sudoku, the game popularized in Japan that involves filling in a 9X9 grid of squares with the numbers 1–9 according to certain rules. Gary McGuire of University College Dublin shows in a proof posted online on 1 January1 that the minimum number of clues — or starting digits — needed to complete a puzzle is 17; puzzles with 16 or fewer clues do not have a unique solution. Most newspaper puzzles have around 25 clues, with the difficulty of the puzzle decreasing as more clues are given. A sudoku puzzle needs at least 17 clues to be solvable. The emerging consensus among mathematicians at a conference in Boston, Massachusetts, on 7 January was that McGuire’s proof is probably valid and an important advance in the growing field of Sudoku maths" ."   Sudoku was the last thing which kept me buying newspapers.  I would buy the News-Journal newspaper out of Wilmington DE.  It was part of my routine: get out of the house, go to the local convenience store, purchase the paper and try to solve the puzzle. Well, that went well until the paper raised the price to $1.00.  I guess folks weren't suppose to know you can better puzzles for FREE on the Internet. websudoku.com now satisfies my addiction. By the way, any Sudoku players out there want to give the above a try?