⟬ Metal Fortnight ⟭———02. Andriy Bruns - Machinist's Stash Engineer BrunS' version of Marcel Gillen's Fire Plug puzzle from 1992.  from the description on Andriy's website: Hiding place with a labyrinth lock. Its easy to close it, but opening it requires strict adherence to the algorithm and an error at any stage throws you back. At the same time, there are no hints how to open the cache on its body. This will be a challenging puzzle for many people. ...