GraviTrax Technology & Engineering GraviTrax Tunnels

Tunnels

by GraviTrax

$30 ~~$52.45~~ /

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Turn your marble run into a magic show where metal spheres vanish into the dark and burst out where you least expect them.

👀 Surprise factor adds mystery by hiding the marble's path
🧠 Brain power challenges kids to track invisible routes mentally
🎢 Vertical action includes U-turns and special rails for speed

The Educator's Note

It adds a 'magic trick' element to the track that younger kids absolutely love watching.
The vertical U-turns are a unique component that you can't get in the standard sets.
It encourages 'blind' planning, which is a fantastic step up for developing spatial reasoning skills.

Play Specifications

🧒 8 years +

Recommended for ages 8 years +

🧱 Builder

Construction & Engineering

🔬 Scientist

Curiosity & STEM

🔊 Moderate

Medium volume

🏠 Indoor

Living Room / Playroom

👤 Independent Play

Solo / Self-Correcting

👥 Group Play

Collaborative / Multi-Player

🧠 Cognitive

Problem Solving & Logic

🤏 Fine Motor

Precision & Grip

💡 Creativity

Innovation & Imagination

The Educator's Note

It adds a 'magic trick' element to the track that younger kids absolutely love watching.
The vertical U-turns are a unique component that you can't get in the standard sets.
It encourages 'blind' planning, which is a fantastic step up for developing spatial reasoning skills.

Play Specifications

🧒 8 years +

🧱 Builder

🔬 Scientist

🔊 Moderate

🏠 Indoor

👤 Independent Play

👥 Group Play

🧠 Cognitive

🤏 Fine Motor

💡 Creativity

Add a whole new layer of mystery to your tracks. By replacing standard rails with these dark tunnels, you break the visual line, forcing everyone to guess where the marble will emerge next. It turns a predictable run into an exciting game of hide-and-seek with gravity. Perfect for builders aged 8 years+ who have mastered the basics and are ready for more complex planning. Connecting the entry and exit points when you can't see the middle requires sharper spatial reasoning and tests their ability to predict momentum and speed unseen.

This expansion is designed for existing GraviTrax fans who want to add complexity and mystery to their builds.

The Master Planner (8-12 years) who enjoys the logic puzzle of connecting tracks they can't fully see.
Teen Engineers (13+) looking to build massive, complex systems where marbles weave in and out of sight.
Families who want to revive their Starter Set with fresh pieces that change how the game is played.

The Element of Surprise

Standard marble runs are all about watching the action, but the Tunnels expansion changes the rules. Now, the metal spheres disappear into curved and straight tunnels, travelling through the dark before shooting out the other side. It creates a 'now you see it, now you don't' effect that keeps spectators guessing. You can even use the tunnel switches to send marbles on different hidden paths, making the outcome a genuine surprise every time. Note: This is an expansion and requires a GraviTrax Starter Set to play.

Defying Gravity

This isn't just about covering up the track. The set includes vertical U-turns that allow marbles to drop and reverse direction in a tight loop, saving space and adding speed. You also get special Bernoulli rails—plastic tracks designed to manipulate speed and stability in ways standard rails can't. These pieces encourage experimentation with kinetic energy, teaching kids that sometimes the fastest route isn't a straight line.

Expanding the Challenge

Because the marble is hidden for sections of the run, builders have to rely on physics and planning rather than just reacting to what they see. It forces them to visualise the path inside the tunnel. Does the marble have enough speed to make it through the curve? Will it exit at the right angle? It's a brilliant way to deepen the engineering challenge without feeling like a science lesson.

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Why gift givers choose this

Extends Play Life revitalises the Starter Set, getting kids back to building.
STEM Learning teaches spatial awareness and trajectory prediction naturally.
Premium Quality components click together perfectly, typical of Ravensburger engineering.

Included in the box

Includes 2 base plates, 4 curved tunnels, 2 straight tunnels, 2 tunnel switches, 2 vertical U-turns, 2 Bernoulli rails, 2 O-rails, and 2 catcher baskets.