One thing that keeps luring me back to Starfield - other than the idea of building space stations out of onions - is a mysterious game within the game. Titled "Symbol Game", it consists of chunky, etched, sloping pieces and a 4x6 grid mat adorned with stars, dots and lines. You may have pocketed a few sets, during your journeys across the Settled Systems. They're not hard to find. But as far as I can tell, nobody has discovered the rules, though there are plenty of theories.
