You can experience a rigorous mental workout with just a lift of the pen and these 140 challenging crossword puzzles. Feel the burn as you tackle these tough crosswords created by renowned puzzle constructors. While some clues test your recall of historical knowledge (6-letter word for "Revolutionary rider"?-Revere) and vivid vocabulary (8-letter word for "jumble"?-pastiche), others challenge you with themes, from "tongue twisters" to "con men" to "Charles Dickens." There's even a retro selection of puzzles dating back to the 50s and 60s to put you through your pop culture paces (Actress Barrymore? Ethel, not Drew). In addition to standard 15 x 15 square crosswords, this collection includes unique 17 x 17 square designs to vary your workout for maximum brain building.