Little builders can put a twist on classic peek-a-boo play with the Peek A Blocks! . Designed for your toddlers little hands, this rolling cow is easy-to-grip and easy-to-stack for endless peek-a-boo fun! Playset includes 1 Peek A Blocks and 1 big building block All-new design for action-reaction play: Place your Peek A Blocks animal on a block to activate its peek-a-boo surprise Ideal for ages 1+, and endorsed by Fisher Price, First Builders blocks are perfect for little hands, providing hands-on play to develop imagination and gross motor skills Blocks are compatible with all Peek A Blockd playsets and Mega Bloks building toys for endless learning fun!