Gravitrax Expansion Tunnels

With GraviTrax you can explore gravity without getting bored, because the additional pieces allow you to expand your path to infinity.
Make the marbles disappear and reappear!
With these accessories you will create a surprise effect.
Use the tunnels, tracks and base platforms together with the GraviTrax Starter-Set to further enrich your track and transmit more acceleration.
Will you succeed in not losing sight of the marble when will it enters the tunnels?
To be used only in combination with GraviTrax Starter Set (sold separately)