The Book of Puzzles and Brain Teasers Author:Reader's Digest Editors An intriguing collection of over a thousand specially commissioned riddles, mysteries, and verbal conundrums, this one-of-a-kind collection is guaranteed to build analytical, creative, and practical thinking power while bringing hours of fun and entertainment. All rated with a level of difficulty from 1 to 3, the puzzles will strengthen a wide s... more »pectrum of mental skills.« less