A book of mental exercises with brain teasers that challenge your brain with word riddles, number and logic puzzles, helping to boost your brain's activity. Organized with an increasing level of difficulty from easy to challenging, there are +250 puzzles, brainteasers, trivia quizzes and word games that are engaging, fun, frustrating and designed to keep your mind sharp, reducing risk of dementia, daily boredom and improving memory and concentration. Hours of fun-filled enjoyment with questions and answers that develop your problem-solving skills in logic, math and word problems.