Fisher-Price Stack 'n Surprise Blocks Blockity-Pop Tugboat Offers stack and spill fun, roll-along play, and peek-a-boo, pop-up action Easy stack building bumps on the vehicles makes it easy for baby to stack the 3 included blocks When baby pushes the tugboat, the block faces will pop up and peek-a-boo Enhances fine motor skills as baby grasps and stacks blocks Encourages thinking skills as baby figures out how to stack blocks and anticipate surprises