Build and Customize the most outrageous K'NEX "wow" ever! It's the giant Big Air Ball Tower! Build 3 exciting obstacle courses all in one tower. The air blast action starts the balls up the 5-foot, anti-gravity tube. Watch it avoid the danger for a winning ride on the rails to the pivoting power arm, a big bounce off the trampoline platform and into the bottomless basket, and more! It's over 1,350 pieces of awesome building accomplishment, complete with step-by-step color-coded instructions. Includes instructions for a 3-foot Junior Tower for builders who want to get into the action in a third of the time.
