geocache

Make a Magic Blocks Gadget Cache

This article appeared in Make: Vol. 86. Subscribe for more maker projects and articles! 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....