Brain-Flexing IQ Tests

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.