What better description than the one from our readers: You're walking through a desert in a land where half the natives are cannibals and the other half are vegetarians. Also half of each group always tells the truth and the other half always tells lies. To make matters worse each will only make one statement to strangers. You come across two natives and the first says something in his native tongue, The second looks at you and says He said he will lead you to safety, you can trust him, but don't believe him, he's a big liar. I'll take you to safety. Which native do you follow? I love problems like this. I mull them over in my head and stick with them until I get the right answer. It is for this reason that I snapped up a copy of Paradox from E-dition. The editor promises that math can be fun. I am happy to report that the book did not disappoint. The puzzles were mostly new to me, though I've seen a few before in some variation or another. What was especially exciting was the interface. The book is in an exe format and provides the reader with interactive hints, chastisements and answers. This added to the fun of solving the puzzles greatly. The Editor does warn that the interface is a little particular about how answers need to be phrased. Sadly this warning is warranted. Since many of the puzzles have alternate answers, you can be chastised after giving the correct answer, just not the computer's answer. I quickly overcame this limitation and decided I didn't need to be praised when I came with an answer that I knew was correct. In fact, I've gone through the puzzles again and again looking for ways to fool the book. If you like these type of puzzles you'll love this book. I do want to say a little about the interface of the book. Unlike most e-books that come in html or similar formats, E-dition releases its books in exe files. The look and feel of the book is like nothing I've ever experienced before. The pages are textured and the interface is seamless.