LEGO Chain Reactions 2: Gravity DropAssemble a high quality, foot and a half tall chipboard gravity drop tower full of LEGO contraptions. Unleash a pack of 6 wooden balls from the starting gate and watch them race through a maze of twists and turns, sliding down ramps, flipping spinners, and whirling down a funnel before they finally plonk into their destined buckets. (All included right out of the box!) But it doesn't stop there. Build and rebuild activities that include a gravity