Magnetic puzzle box geocache

I designed this puzzle for a geocache. It's heavily inspired by RWReese's design, and it opens the same way; you have to smack the puzzle to get ball bearings to jump from one magnet to another, unlocking the cache. Once unlocked, it slides open to reveal a standard "bison" container which holds the log sheet.

The base of the puzzle has six rare earth magnets so that it can be directly stuck to a metal surface.

You'll need:

- Eight 3/8" x 1/10" rare earth disc magnets (I purchased mine