First in the new "Brain Gym" puzzle series, this ultimate brain training puzzle book is packed with over 400 puzzles and solutions to help you reach your maximum mental potential. Organized by difficulty and type, this all-inclusive game book includes everything from language puzzles, letter equations and logic puzzles, to math and science teasers, probability puzzles, rebuses, riddles and trivia. Indulge your penchant for puzzles as you face challenge after challenge and give your brain the ultimate workout.