Book excerpt: Acrostic puzzles lift word game fans beyond crosswords to the next level. Just dust off your memories of great writers and philosophers, and add today's movie stars and sports heroes. Each of the 40 puzzles features three simple steps, starting with treating the clues just like crosswords. Next, you fill in the empty boxes with words that complete a quote from the book. Fortunately, you can figure out answers you don't even know from the clues provided, so the more you play, the more informed you become! Finally, you read the first letters of the answers to read the author of the quote and its source. You'll have fun, even as you learn. Mensa is the internationally renowned high IQ society which has a worldwide membership of almost 100,000 members in more than 100 countries. There are 28,000 members in the UK, including 2,200 Junior Mensans under the age of 16. To join Mensa, the only requirement for membership is that an individual's IQ falls within the top 2 per cent of the population.