I gave this book as a little graduation gift to my 8th graders when they graduated. We did some of the puzzles/riddles in math class. This book is good for 5th-8th graders, or any age logic/puzzle nerd who likes figuring things out from clues. An example: UNCLIMBED: Why has no one climbed the largest known extinct volcano? HINT: It is not underwater; it is clearly visible above ground. It would be very difficult to climb. ANSWER: The largest-known extinct volcano is Mons Olympus on Mars.
