After landing on the planet Karateka, your mission is to exterminate all Viroids you come across.
The Spectrum version was created with PAW, whereas the C64 port was done with The Quill.
The Amstrad version was produced as both a tape-based Quilled version and a CP/M disk PAWed version.
Although the screenshot shown of the Amstrad conversion states it was produced by Philip Reynolds for The Adventure Workshop, this port was originally sold by Anthony Collins' The Guild label. It's possible the title screen was adjusted when the CP/M version was later sold by The Adventure Workshop.
An Atari ST version, produced with the STAC, was in development for "over 18 months" but doesn't seem to have been completed.
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