Gadget caches are geocache containers that require you to solve a mechanical field puzzle in order to gain entry to the log sheet.

Gadget Caches

Gadget Caches with WV Tim

Gadget Talk - Building a LED Code Decryptor

Geocaching Gadget Caches

Geocaching Central

Gravity Lock Gadget Cache Building, part 1

Gravity Lock Gadget Cache Building, part 2

Gravity Lock Gadget Cache Building, part 3

How to Make a Hollow Book Geocache

Simple PVC Gadget Cache