We offer structured and free form hands-on activities in engineering, physics, architecture, and art at our drop-in center. Children and adults can use hundreds of thousands of LEGO elements to independently and cooperatively pursue their interests.  We sell LEGO building sets at our Marin and Pleasanton locations. Our selection of LEGO® sets is one of the most extensive in the country. We are constantly adding to the selection. We also have an extensive LEGO parts shop at our Marin location. Our toy stores are open during our drop-in hours.