Start your day with a round of cerebral calisthenics. Cliff Pickover-"one of the most creative, original thinkers in the world" (Journal of Recreational Mathematics)-has again compiled an assortment of devilishly difficult mazes, cryptograms, visual puzzles, mathematical teasers, anagrams, and other brain-boggling exercises-313 all told (Saturdays and Sundays share a page and a puzzle). Pickover's puzzles are like no one else's, filled with humor and tidbits of knowledge. Answers appear on the flip side of each page.