Ring World is a four-piece puzzle. It is a two-piece sphere contained in a two-piece ring. The purpose is to take it apart. The puzzle can be split in half when when the ring and the sphere are properly aligned. This is the polished metallic version. You can find the metal version
here.
Watch the
YouTube video.
Read at the
Shapeways Forum.
Read more at the
Non-Twisty Puzzles Forum.
Please
contact Oskar directly if you have any further questions.