These popular logic puzzles from Japan are taking the world by storm. Sudoku looks like arithmetic but requires just logic. While the rules are simple, the solu

Obsessed sudoku fans know that the newspaper puzzles just aren't enough to feed their solving addiction. But they don't have to worry, because they can pull out

There’s a common belief about the mental acuity of the aging brain: "If you don’t use it, you lose it.” Research published in the December 20, 2006 issue

Every day, tens of millions of sudoku fans get out their pencils and attack the latest 9x9 puzzle in their daily newspaper. But a huge percentage of those fans