In the mood to challenge your brain? Here are some printable sudoku puzzles that are sure to make you think hard. Sudoku puzzles aren’t easy, but with a little practice and some helpful sudoku ...

(His best finish was fifth, in 2010, but he had practiced too hard ... Sudoku team title, and the United States won the puzzle team title. Mr. Endo won the individual puzzle championship, by a ...

For dedicated number crunchers, it's not terribly hard to "brute force" Sudoku puzzles by running dozens if not hundreds of possible combinations in search of the right answer. But a team of ...