Gecko Run Flex-Corner Expansion - Thames & Kosmos

Turn the Corner. Route Across Surfaces. Build Further. — Gecko Run Flex-Corner Expansion Pack

The Gecko Run Flex-Corner Expansion Pack adds flexible corner pieces to your vertical Gecko Run marble run — letting you route the track around corners, across walls, onto doors, around window frames, or between surfaces that meet at an angle. Where standard Gecko Run track runs in straight or gently curved descents on a single surface, the Flex-Corner pieces allow the run to change direction and transition between surfaces, dramatically expanding the build possibilities. Tracks are made from renewable raw materials and produced in Germany. Requires the Gecko Run Starter Set or Deluxe Starter Set. Ages 8+.

What the Flex-Corner Does

Most Gecko Run builds run vertically down a single flat surface — a wall, a window, a door. The Flex-Corner pieces solve the constraint of the 90° edge: instead of stopping at the corner of a wall, the marble run can now turn the corner and continue on the adjacent surface. This opens up build configurations that span multiple walls, wrap around doorframes, cross from a window to a wall, or navigate around obstacles that would otherwise break the run. For children who have outgrown what’s possible on a single surface, the Flex-Corner is the expansion that unlocks the next level of design complexity.

Good to Know Before You Buy

• Recommended age: 8+
• Brand: Thames Kosmos
• Compatibility: Requires Gecko Run Starter Set or Deluxe Starter Set — not a standalone product
• Function: Corner and surface-transition pieces; routes the marble run around angles and between surfaces
• Mounting: Nano-adhesive pads — no sticky residue, removable from smooth surfaces without damage
• Materials: Tracks from renewable raw materials; made in Germany
• Batteries: Not required

Frequently Asked Questions

Do I need the Starter Set first?

Yes — the Flex-Corner Expansion Pack requires the Gecko Run Starter Set or the Gecko Run Deluxe Starter Set as the base. The expansion adds corner and transition pieces on top of the existing system; it does not include the tracks, marbles, or full mounting system needed to build a complete run from scratch.

How is this different from the other Gecko Run expansion packs?

Most Gecko Run expansions add a stunt or effect — a loop, a snake, a twister, a trampoline, spinners, a launcher. The Flex-Corner is a routing expansion — it doesn’t add a dramatic visual effect to the run; it expands where the run can go. It’s the expansion for builders who have filled their current surface and want to extend the run into new territory. Best combined with a large existing build rather than used as a first expansion.

Will it leave marks on my walls?

No — the nano-adhesive pads hold firmly to smooth flat surfaces and remove cleanly without sticky residue or surface damage. The pads are repositionable, so you can adjust the corner routing and redesign the layout without worrying about marks.

The Full Gecko Run Range

• Gecko Run Starter Set — start here; core tracks, marbles, and the nano-adhesive mounting system
• Loop Expansion Pack — adds a full loop element
• Snake Expansion Pack — adds a weaving slalom element
• Twister Expansion Pack — adds a spinning spiral descent
• Trampoline Expansion Pack — adds a bouncing trampoline element
• Spinners Expansion Pack — adds two interactive gear wheels
• Rapid Fire Expansion Pack — adds the semi-automatic Rapid-Fire Launcher
• Flex-Corner Expansion Pack — this pack; corner and surface-transition pieces for multi-surface builds