Kullerbu Mountain Adventure Track SetLarge Kullerbu mountain themed ball track set made for rolling action, building, experimenting, and open ended STEM play. Kids can send the edelweiss, marmot, and ibex balls racing through spiral curves, a bell gate, rockfall, gondola station, domino stairs, and mountain inspired track features. This 88 piece set creates over 8 possible track configurations and includes a battery powered truck that climbs toward the mountain top and gondola station.