The puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best

The hottest craze in puzzles! From puzzlemaster and New York Times crossword editor Will Shortz comes sudoku, the new "wordless crossword" puzzle that's taking

“The Best Puzzles Are Made by Happy Employees.” So Ad Age describes the credo of Nikoli, the Japanese puzzle company that invented the Sudoku craze and supp