Marbles haven't experienced something like this - unless you stuck them in your pocket when riding a roller coaster! The 70-piece Marble Run Vortex challenges constructive minds to build master mazes with a special double-entrance vortex chamber with large funnel, 2 exclusive spiral tracks, long bridges for large construction, and a sturdy base to handle crazy construction. Marble Run Vortex includes plenty of sturdy, innovative pieces to keep kids working, working, and working on new and exciting marble mazes! Can be used with Transparent Marble Run.