Discover Lego GBC

What is a Lego GBC?
What is a Lego Great Ball Contraption?

The GBC Standard
Learn about the rules that allow for modules from different builders to work together  without modification.

Lego GBC Balls
Learn more about the special Lego balls that we use in GBC.
Lego 9 Volt Train Speed Regulators
Learn about the vintage train controllers we use in GBC.
Lego Power Functions Motors
Learn about modern day Lego motors that drive our GBC modules.
Lego Power Functions Switches
Learn about how switches can help setup and control your Great Ball Contraptions.
GBC Modules for Beginners
Recommended modules for people new to Lego Great Ball Contraptions.
Lego Powered Up Reference
Lego Powered Up Hub and Motor Reference