GraviTrax Element Colour Swap counting The other pen will not

The other pen will not only reveal the information

Can you position the trampoline so that the marble flies really far

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The Reflex™ is the easiest yo-yo for new players

GraviTrax Element Colour Swap counting The other pen will notBring a new element of surprise into your GraviTrax marble run! As if by magic, the marble changes color as it passes through the Color Swap. Simply hide a marble within the tunnel the momentum from the incoming marble propels the hidden marble out the other side with the illusion the marble changed colors! Its a snap to combine Color Swap with any GraviTrax Starter Set to experience the power of gravity and educational fun today! What makes a great