How smart are you? Though these tough little quizzes offer plenty of entertainment, they're designed to be similar to the ones found in actual IQ tests. Five sections focus individually on verbal, visual, numerical, calculation, and logic skills, while a final chapter called IQ Testers brings every type of question together in twenty tests, with fifteen questions in each. That way, testers can see how well they do in each discipline, and identify their particular strengths and weaknesses. Those with a competitive streak can check out the performance guide-or make it harder by going against the clock.