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. External links GameFAQs 1985 video games Europe-exclusive video games Mastertronic games ZX Spectrum games ZX Spectrum-only games Video games developed in the United Kingdom