You are looking for a 200ml systema container.
Inside the container is a metal object - this is the field puzzle.
Inside the metal field puzzle is a nano cache.
Inside the nano cache is the log sheet that you need to initial in order to find this cache.
You need to then piece the puzzle back together in order to re-set it for the net geocacher.
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The cache's difficulty rating reflects the challenge provided by the field puzzle.
Finding the initial cache should be relatively straight forward, though it is well hidden and there are a few options for where it could be.