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

200 New Puzzles -- From Fiendish to Super Fiendish Su Doku, "the crossword without words," comes with a warning: it is seriously addictive. You don't need to be

"The Big Book of Visual Sudoku" reinvents the world's most popular number game by adding a second visual layer on top of the traditional number/logic puzzle--us

Sudoku has become an addiction for millions--and that’s great, because mind games help keep our brains in good working order. But even though the rules are si