ACE is recommended by LSAT-prep teachers for one reason, it works. LSAC does not want you to see this book! When parts of ACE were posted on YouTube, LSAC (the LSAT creators) thought the games were from previous LSAT. Yes, ACE is really that good! It"s good enough to fool LSAC. It"s good enough to help you ACE the games. We are so confident that you will love ACE that we offer an unconditional money-back guarantee. Plus, if your games score does not improve after using ACE, we will give you double your money back. No other book makes this guarantee. Not one. Updated every year since it"s initial publication in 2006, ACE continues to be "the gold standard for teaching the logic games."