Ready to automate your marble track fun? Check out the “GraviTrax POWER Extension Interaction” Set! Packed with 8 accessories that link via radio signals — you determine if the POWER Trigger signals the POWER Starter, Switch or Lever. Or, use the POWER Controller to be in charge! Watch your marbles get a lift up 7 levels with the POWER Elevator; no reset required! Completely compatible with all GraviTrax sets, players learn basic coding skills as they boost the power of gravity!