Generally no — each brand has its own connector system. GraviTrax, GraviTrax Pro, GraviTrax Junior, and GraviTrax Power are all cross-compatible within the Ravensburger family. Hubelino is compatible with DUPLO. Cuboro sets all work together. But mixing brands (e.g., GraviTrax with Cuboro) won’t work natively.

We recommend either the GraviTrax Junior Starter Set or the Hubelino Pi set. Both have larger, safer pieces designed for small hands. If your child already plays with DUPLO, Hubelino is an especially easy transition since it snaps right onto existing DUPLO bricks.

No — Marble Run Universe is an independent resource and review site. All “buy” links on this page go directly to the official manufacturer or a trusted retailer like Amazon. We may earn a small affiliate commission, but you always pay the same price.

Standard marbles are a choking hazard for children under 3. Always check the age rating on the box. For children under 4, look for sets specifically designed for younger ages (like GraviTrax Junior 3+ or Hubelino 4+) which use larger balls and pieces. Adult supervision is always recommended.

GraviTrax by Ravensburger wins by a wide margin with over 100 expansion packs, action stones, and themed sets. Cuboro has a solid range of about 20+ expansion sets. Marble Genius and Hubelino have smaller but growing expansion lines.