It's a pocket-size brain gym. Now in a portable 4" x 6" format, here are more than 500 full-colour puzzles from the original Big Book of Brain Games. There are mental games, visual challenges, logic posers, riddles, and illusions. Each designed to stretch neurons and give the brain a workout-all in a format that will fit in your pocket. The puzzles (both original and mind- boggling adaptations of classics) are rated in difficulty from level one to ten, but even the easiest are guaranteed to make the solver feel smart. Can you cross the Impossible Domino Bridge? Break through the Queen's Standoff? Weild the Sickle of Archimedes?