Want to know how your brain measures up? You can go to a psychologist, pay lots of money, take a boring standardized test, and find out what you knew all along; that you are a genius, or you can have fun with this book. You won't be able to get an official score, as there has been no attempt to standardize these tests in the way psychologists might. But then, who cares?

Every test in the book has 15 questions, and if you want to use a time-limit, give yourself exactly 30 minutes for each test. If you finish early, give yourself one extra point if you have got at least 12 correct. The tests are not intended to get any harder or easier as you go through the book, but you will probably find that you will get the hang of some of the repeated puzzle types as you go through. This may make your solving faster.