It has never been easier to build a complete Great Ball Contraption (GBC) loop yourself! It features multiple GBC modules which all work together in harmony to make a full loop so the ball flow will never end. This GBC is entirely built using only parts from the LEGO 42145 Airbus H175 Rescue Helicopter set and can be referred to as Alternate Build of the 42145. When building this GBC it makes sure you master the GBC building techniques and tricks so that you eventually also can build your own GBCs. The whole machine is powered by a single LEGO motors which comes with the LEGO 42145 set and powered via the official LEGO Powered Up battery box.

Step right up and enter the funhouse!

The GBC 60 Funhouse brings the chaos, charm, and playful surprises of a classic funfair straight into your Great Ball Contraption layout. Inspired by traditional funhouse attractions, this GBC is packed with unexpected movements, colorful action, and plenty of “did you see that?!” moments.

Just like a real funhouse, nothing here is quite as straightforward as it first appears. GBC Balls twist, turn, and tumble through a lively arrangement of tracks, mechanisms, and interactive elements. Balls may disappear briefly, reappear somewhere else, or take wildly different paths each time — keeping the action unpredictable and endlessly entertaining.

Multiple animated features work together to guide the GBC Balls through the attraction, with rotating, swinging, and bouncing elements creating constant motion. Every section is designed to keep your eyes moving and your attention locked in. Whether the balls are racing each other, being delayed by clever obstacles, or released in sudden bursts, there is always something happening.

The GBC 60 Funhouse is designed to integrate seamlessly into any standard GBC layout, allowing easy connection to other modules. Its playful behavior makes it a perfect centerpiece or eye-catching side attraction within a larger GBC circuit.

This funhouse-themed GBC captures the spirit of the funfair — where unpredictability is part of the fun, and every run feels just a little bit different.

Fun Fact

For the LEGO 42145 Airbus H175 Rescue Helicopter set, we pushed ourselves to get everything just right. Working within a limited part count meant revisiting the design more than once, carefully rethinking the structure to create a sturdy and reliable foundation for the GBC. With fewer beams and structural elements available, every piece had to earn its place.
At the same time, this project gave us the perfect opportunity to experiment with brand-new ideas. We explored and refined several new mechanisms and features specifically for this GBC, and turning those concepts into a smooth, dependable build took a little longer than anticipated.
The extra time was well spent — resulting in a stronger design, smarter use of parts, and exciting new elements that make this GBC truly special.

Work Together – Enhance building skills

The whole GBC is split into different parts/modules which are assembled together during the build. Ideal for working in groups as each builder can work on a sub assembly and later click everything together. Because of this construction and flexibility it is also always possible to separate the modules again and make your own unique configuration or use modules as separate machines.

A really cool feature of the GBC 60 Funhouse is its ability to convert with ease into a GBC Layout Module. In this way you can easily connect this GBC to all our other GBCs to make the loop even bigger. More information in the building instructions. Clean and simple: Convert with ease.

Building Instructions Preview

Preview

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