Gecko Run: Marble Run Trampoline Expansion Pack — an add-on expansion for the Gecko Run marble-run system that introduces trampoline-style action to your layouts. Designed to extend play possibilities, this compact expansion lets kids experiment with bounce and trajectory as part of their marble-run setups. Currently backordered; will ship when restocked. Ideal for shoppers looking to expand an existing marble-run set with a new stunt-focused element to spark creative, hands-on STEM play.