Great Ball Catalog

GBC Module Catalog

The most comprehensive listing of Great Ball Contraption modules

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Mac Pan

Mac Pan

GBC module inspired by the original Pac Man arcade cabinet. Successor to the Monkey Pong module, built in the same form...

Bens Znap Module

Bens Znap Module

Little Drum

Little Drum

REF06 - Mia�s Friendly Wheel

REF06 - Mia�s Friendly Wheel

REF09 - Rotating Truss

REF09 - Rotating Truss

MOD04 - Avengers Tower

MOD04 - Avengers Tower

Monkey Pong

Monkey Pong

GBC module inspired by the old Donkey Kong Arcade Machine by Nintendo. Can be run as a normal inline module or in...

Sherman Ball Counter

Sherman Ball Counter

MOD10 - Avengers Tower Mark II

MOD10 - Avengers Tower Mark II

REF07 - Andrea�s Tunnel Of Love

REF07 - Andrea�s Tunnel Of Love

MOD03 - Tower Bridge

MOD03 - Tower Bridge

Birdhouse Ball Pump

Birdhouse Ball Pump

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About the Great Ball Catalog

Great Ball Contraptions (GBC) are intricate LEGO machines that transport small balls through creative mechanisms and modules.

This catalog is the world’s most comprehensive resource for GBC modules, featuring hundreds of modules from dozens of builders, a lot of them with build instructions. Whether you’re a seasoned builder or just discovering the hobby, you’ll find hundreds of unique designs to explore and build.

Start browsing to discover the amazing variety and ingenuity of the global GBC community.

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