Gecko Run: Marble Run Challenge Edition Unicorns you’ll be building and flipping

you’ll be building and flipping with each challenge more difficult than the last

These high-speed racers light up the track with thrilling head-to-head battles

Themed expansion sets add to their marble run fun

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The vest features a realistic stuffed dragon head at the front

Gecko Run: Marble Run Challenge Edition Unicorns you’ll be building and flippingGame on! The Gecko Run Challenge Edition includes everything you need to challenge yourself or others to a marble run building competition. With 32 challenge cards, two rapid fire launchers, and enough parts for two kids (or two teams) to build their vertical marble runs at the same time, this set turns Gecko Run into a fun, thrilling engineering game. The open ended challenges set rules such as using only the specified parts in an allotted amount of