CarePlay Grid Blocks add unlimited fun and creativity to constructive play. Blocks are colorful and easy to use and can be used indoors or outdoors. Gives your young builder the blocks needed to follow whatever path the imagination takes. Heavy duty blocks will create solid pathways for children to walk upon, tunnels for them to crawl through or even a playroom to call their own. Because each block is exactly 1 square foot, they can be used for simple activities that introduce linear and area measurement. Blocks are just right for children's hands while the 3 by 3 design makes attaching the blocks easy. 6 bright primary and secondary colors that will continually look new because the colors are molded right in. Each set includes square blocks, both solid and see through, as well as triangular blocks for pathway corners and pointed rooftops.