Criss cross, under & over! With the Helix you can join up to six different tracks. When a marble enters the Helix it will move down to a lower level without changing its direction. Up to six marbles can pass through this Action-Stone at the same time! Combined with a Starter-Set, exciting tracks can be built without the marbles obstructing each other on their way to the finish. How many marbles can cross in your tracks? This set
Includes:: 1x Helix This STEM system [ Science, Technology, Engineering & Maths] is an ideal one to teach kids about gravity, magnetism, kinetic energy & fun. Hit a snag? Freestyle with your own track design or use the tasks & blueprints included to help you to get started in the world of Gravi Trax! Are the gravity spheres stopping or flying off before reaching the end target? Time for some problem solving. Rebuild & try something different! The Gravi Trax track system can be extended indefinitely with extra track packs & add-on’s – each sold separately. Suitable for ages 8 years & up.