The National Geographic Jumbo Cardboard Building Blocks set invites children to dive into a world of creativity as they build their very own castle playhouse. Designed for little architects aged 3 and up, these extra-thick cardboard blocks are not only safe and durable but also encourage imaginative play and cooperative building experiences. As kids work together to create and explore, they enhance spatial awareness, problem-solving skills, and teamwork—all while discovering fun facts about castles through the included Learning Guide! Watch them grow their confidence and creativity as they bring their unique visions to life with each block they stack. 3+ years