Jason's Gem
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Jason's Gem is a computer game for the ZX Spectrum. It was published in 1985 by Mastertronic and written by Simon White. The hero Jason must make his way through a series of caves in search of the legendary gem of the title.
The game begins with Jason docking his spaceship on a moving platform. He then descends through rocky caverns blasting away the rocks as he goes. Upon reaching the bottom of the caves he must negotiate a series of platform screens before reaching his goal and attaining glory.