Published by Cambridge University Press in 1994, this classic work by Barry R. Clarke contains a variety of highly original and entertaining teasers from logic and liar puzzles to challenging digital deletions to innovative lateral mind benders. Though the puzzles require no special mathematical knowledge, even members of Mensa will be tested to their limit with those in the Advanced section. There is even an informative History of Recreational Mathematics section. An ideal gift for anyone who enjoys thinking.