Keep your mind fit with brain aerobics! If you like great mental exercises, try brain aerobics. All you have to do is open this book, lift a pencil, and flex your mind while solving this assortment of invigorating puzzles. In Brain Aerobics Cryptograms, you'll need to be sharp because all of the puzzles are meant for the best and the brightest. With concessions to timid newbies, every cryptogram uses weird words, strange letter combinations, and tricky syntax. The cream of the crop, these puzzles are a tough but enjoyable challenge.