What size marbles does Quercetti use

My son has used the standard sized glass marbles (they are heavier and run a bit faster on most sections), the ones that come with the set were slightly larger, plastic and lighter. Original 11/16 inch (roughly 17mm). Glass ones are roughly 5/8 inch (~slightly larger than 15mm).. Both types work fine. Hope that helps!

Help!! the tower with the elevator keeps tipping forward. i've redone it over and over following the instructions.

Be sure it is constructed on a fairly level surface and that both sides are securely attached to the entry and exit track. The exit track is particularly important. It seems to work OK for my grandson.

Will this work with 25mm marbles?

The ideal size marble for this set is 19mm (the size of marbles included), so 25mm will be a bit larger. The best performance will be realized with the 19mm size, but we do encourage experimenting with marbles of different size and materials which allows you to make interesting observations about the physics involved (speed, gravity, centrifugal force, friction).

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