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I bought this for my great nephew who's 7 years old and it's keeping him busy. Maths is so important in life so any encouragement doesn't go amiss! He's enjoying it.

The strength of this excellent book is the sheer breadth of difficulty from the obvious (which three numbers give the same result if they are added or multiplied?) to Cambridge tripos level brain fryers.

It’s ok. Some of the ‘riddles’ are a bit naff and honestly just hard questions. Some are quite hard for kids I’d say. However it does have a section at the back full of answers and explains how to get the answer. My child although he is very clever for his age got fed up with it quite quickly as the riddles were all quite hard or confusing

Grandson loved the challenges! Helped to improve his self-confidence and kept him off his electronic gadgets. Got him to explain how he had reached his conclusions to me. Precious one to one time.

Perfect size and font for the age range although the puzzles are considerably harder than the age billed. We found most of the adults were kept guessing. Nice format we hope she'll grow into it in a couple of years.

My 9 year old is loving this book. We try to do a riddle each night before bed. They are really well thought through and described. Also, calling the sections, “Difficult, Evil and Fiendish” makes every victory seem special.

Bought for 8 yr old but will keep it a while as some riddles too difficult

Enjoyed using this book on Kindle recently during a games night, on a Zoom call with friends. It got all the adults and children thinking laterally, and 'out of the box' for some of the questions. They are mainly maths based, so pen and paper might be good to have to hand! And a calculator, if like me, you enjoy problems and riddles like these but can't always process the arithmetic elements fast enough in your head. A few questions caused lively debate afterwards! I've only used the book on this one occasion, and selected questions from each section, but I look forward to using it again.