Make a Magic Blocks Gadget Cache

The Magic Blocks gadget cache is a fun and simple “proximity and order” puzzle. It consists of four gadget blocks. Each will illuminate a single digit that you program into it — but only when all four blocks are placed side by side, in the correct order! Strategically located magnets and magnetic switches are used to sense the proximity of each block.

The four digits can be used as a code, or a combination to a lock, or for any other purpose you like in your geocache. You program each magic block with the digit of your choice. Our kit is fairly easy to assemble, requiring only basic skill in soldering. We’ve designed a circuit board and a custom 3D-printed case to make it quick and easy. Or you can source your own parts and DIY it!

Each magic block requires two AA batteries, which provide for a very long operating life. When not in play, the magic blocks must be stored in a manner that keeps their sides separated by 1½” or more, or they may activate while hiding in your cache, and drain the batteries.

Special thanks to Trycacheus, for the Magic Blocks idea and his blessing to share it with you!