The fun really stacks up for baby with the Fisher-Price® Stacking Action Blocks. Each building block offers your baby 4 sides of play: letters, numbers, peek-a-boo play and a fun action. The blue block’s fun action is a rolling drum, the red block’s is a spinning wheel with beads trapped inside, and the yellow block’s is a clicking dial. Pressing the buttons on top makes the fun actions happen on each block. Or baby can stack the blocks tall and activate them all with one “magic” press of the top button! You’ll love watching as the fun builds, along with fine motor skills and eye-hand coordination!