Amazon.com offers the K’NEX Thrill Rides – Double Doom Roller Coaster Building Set – 891 Pieces – Ages 9+ Engineering Educational Toy for $29.99.
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Features: Create an amazing roller coaster that stands 2.5 feet high! The K’NEX Thrill Rides Double Doom Roller Coaster Building Set allows your children to explore endless possibilities and develop their creativity as they build a real-life working replica of a roller coaster. Alternative roller coaster models can also be built by following the downloadable instructions. This building set is recommended for children ages nine and above.
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