Sudoku Easy to Hard Presented by Will Shortz, Volume 2: 100 Wordless Crossword PuzzlesPaperback, 1 July 2005

The hottest craze in puzzles!

On no account should any reader not already hooked so much as a glance at a sudoku. That way lies addiction and madness. Sudoku are to the first decade of the twenty-first century what Rubik's Cube was to the 1970s.
--Tom Utley, The Daily Telegraph

From puzzlemaster and New York Times crossword editor Will Shortz comes sudoku, the new wordless crossword puzzle that's taking the world by storm! Once you start, you won't want to stop. These addictive puzzles are easy to explain--just fill the grid with numbers according to the few simple rules--but incredibly fun and engaging to complete. You don't need any mathematics knowledge: Just supply a pencil and an inquisitive mind.
This brand-new collection features original sudoku ranging from effortlessly easy to devilishly difficult, along with an introduction from Will Shortz that explains these fascinating puzzles and how to solve them. If you're a crossword fan, a fan of logic puzzles, or just a puzzle lover in general, you will be engrossed and delighted with sudoku!

A puzzling global phenomenon.
--The Economist