Ravensburger GraviTrax Twirl, Expansion, Marble Court, Innovative and Educational STEM Game, for Kids 8+ Adults, Compatible with Starter Set, 42 Pieces

The Extension Twirl adds 3 additional balls and 38 exciting components to make the balls spin and whirl around the GraviTrax tracks Twisting and swirling are the order of the day with the Twirl expansion; with 4 FlexTubes and tunnels, the track can be twisted and balls can be swirled around in 2 spirals for even more ball action Combined with any GraviTrax Starter Set, the Extension Twirl brings even more variety and ball fun to the GraviTrax universe; how much longer can the ball roll with the new elements GraviTrax is the flexible, expandable, and interactive marble run system for kids ages 8 and up; with GraviTrax, you can create entire marble run worlds; all GraviTrax products from the three lines GraviTrax, GraviTrax PRO, and GraviTrax POWER can be combined with each other; an optimal gift for boys and girls, and not just for birthdays GraviTrax CORE unleashes the spirit of invention and offers endless possibilities beyond the imagination; the versatile combination of elements allows for a playful introduction to the GraviTrax universe and offers plenty of room for creativity and free building; everyone can get started right away and create extraordinary tracks, Manufacturer: Ravensburger