The Peek-a-Blocks Shape Sorter brings introduces shaped blocks to the Peek-a-Blocks. Baby is rewarded with fun sound affects and music when they sort any of the 4 shapes, or if they just drop the shapes through the generous open top of the cube. The 4 shapes include a star with a star shaped pinwheel that spins inside, a circle with a round sun that spins, a square with small blocks that rattle & shake inside and a triangle with a triangular shaped piece of cheese with a little mouse pop out surprise as baby shakes the block. There's also a handle so baby can take it on the road.