ho like problem-solving! Riddles help with logical thinking and encourage children to spot connections between different circumstances. - 144 full color pages - 6-1/2 wide x 9-1/4 high (16.5 cm wide x 23.5 cm high). - Answers are included throughout the book--just in case you get stumped! - Hardcover - Archival/Acid-free paper Ages 5 and up.