GraviTrax - Extension Staircase Lift

The new electronic stone raises several balls simultaneously and automatically 7 height stones. No manual reset is required. As soon as a ball is in the entrance of the action stone, it is recognized and transported upwards. Thus, new energy is gained. Combined with a starter set, an almost endless cycle of marble run fun is started. How many balls can the action stone transport at the same time'

Contents:
1 instruction booklet, 1 action stone elevator