The Arkenstone is a mythical gem highly prized by the dwarves who lost it when their mountain was sacked by the dragon long ago.
Published as a type-in game in Zap! Pow! Boom! Arcade Games for the VIC-20 (US), pp. 28–30. This is almost the same as 'Adventure' in the UK book of the same name, pp. 29–31.
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Can be downloaded here: http://www.vic20listings.freeolamail.com/vic20/books/zapboom_us/arkenstone.prg