@stefanjones wrote:
Vaguely related:
Metagaming Concepts, which turned out some great games but is best known now as the place where Steve Jackson cut his game designing teeth, produced two solitaire adventures for its The Fantasy Trip game which tied into real-world treasure hunts. One was about a Silver Dragon (it was found); the other, a Gold Unicorn.
The Gold Unicorn was never found, even though several treasure-hunters agree on its likely location. There is speculation that Metagaming founder Howard Thompson retrieved the treasure on his own after the company shut down. (Thompson more or less disappeared, although some of his designs were published by Avalon Hill. Who collected the royalty checks? Big mystery.)