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The perfect activity book for kids who like problem-solving! Riddles help withlogical thinking and encourage children to spot connections between differentcircumstances.. 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 paperAges 5 and up.