For me, this book was well worth the price. It is an odd mix of easy riddles I've heard 1000 times, some that really made me think, and others that simply stumped me. I liked the graphics and the organization of the chapters. I would recommend this for a coffee table (although it's quite small for a hardcover) or a gift. It has been a good conversation starter, especially when I first got it and was carrying it around.

Great book to keep your brain ticking over, thoroughly recommended to anyone wanting/needing real mental stimulation in the face of dumbed down TV and Film.

This was a Christmas present for my 15 yr old nephew and he seemed to really enjoy the challenge of solving these riddles. He spent many hours working on them and sharing them with us over the holidays. They were a nice break from the video games the nephews usually focus on when here.

Neurologists encourage those of us who are beginning to become forgetful to exercise the mind as much as we possibly can. Crosswords, Sudoku and so forth are good exercises, but soon they become solveable with less and less mental activity. Books such as this makes the brain stretch itself anew and, hopefully, stay active and preserve our ability to remember and think clearly.

I love the author's good picks of riddles and book design. However, for personal preference to have absolute answers for problems, I would prefer the author to tell more riddles than paradoxes + conundrums. Also, there are no description of the many photos and pictures inside. I suppose those are portraits of great mathematicians and philosophers. Nevertheless, one of the best books of its kind. I found in it the best (yet short) elaboration of the Monty Hall Problem I had ever read. If you want to sharpen your mind, this is it!

This kid has a very high IQ and a curious mind. He seems to take great delight in riddles, etc. that involve science and math.

Not my cup of tea but good for him!

I ordered a book that was supposed to be new but it's obviously used as the cover has tears and is dirty. This book should have been listed as used and in poor condition not new. I was hoping to get a new hard cover copy and I got a used paperback. Very disappointed

Bought this book for my 12yr old son. He and I have had a lot of fun with it. Challenging riddles and interesting topics that get the mind working.

I bought this for my hubby for one Christmas but I ended up reading it. As you do. It did make me think which is always a good thing for anyone.

This book was described as "very good condition" but the cover looked like it was covered in old food or something. I had to throw the cover away.