K’NEX Typhoon Frenzy Roller Coaster Set 51438 2-in-1 STEM Building Toy 640+ Piec

2-in-1 build – Typhoon Frenzy & Tsunami Surge. With640+ colourful K’NEX pieces, children can construct the Typhoon Frenzy coaster and then download exclusive instructions to rebuild it into the excitingTsunami Surge Coaster, extending play value and encouraging problem-solving and engineering skills.

eBay