Fisher-Price Stack n Surprise? Blocks Peek-a-Boo Choo-ChooThis choo-choo takes building to a whole new level with fun songs lights and peek-a-boo train car action. Four pop up blocks go along for the ride and are included with the train. Baby can stack the blocks on any of the four building surfaces atop the train. The large handle allows baby to easily grab and push the train along. When they do the rear train car comes to life with a pop up action where the building bumps and the blocks when stacked pop into motion. Each block and buliding surface has fun faces that play peek-a-boo with baby as they play.