Twisting and spinning are the name of the game with this expansion. While the four FlexTubes can be rotated in 60-degree increments to fit perfectly into the track, the marbles are swirled around in two spirals. The many different tunnel elements allow you to further enhance the spinning effect. How many wacky track layouts can you build with the Twirl expansion and any GraviTrax starter set?

GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and up: With GraviTrax, children, teenagers, and adults don't just build simple marble runs. They create unique marble run worlds. By freely designing the marble runs and exploring the rolling behavior of the marbles, children develop an understanding of science and experience gravity firsthand. The GraviTrax universe includes three exciting lines – CORE, PRO, and POWER. All GraviTrax lines and products can be freely combined. Through countless expansions with classic building elements or bricks that enable special actions and tricks, the GraviTrax universe can be expanded infinitely. This allows everyone to tinker, experiment, and build beyond their own expectations.