This book is perfect for Smart Chilldren and adults, the riddles arent too hard neither too easy. This book contain 150 tricky riddles enough to bewilder even the smartest, author has compiled a set of 150 tricky and fun riddles keeping in mind for all age demographics Example of riddles present in the book. 1. A water container weighs 100 pounds, what you must add to it to make it 50 pounds? A: A hole in the container 2.What is something that is larger when it is new, and smaller when it is used? A: Eraser This Book also contains a Points table that can be used to log the Name and accuracy of the player. which works like a leaderboard.