The SDL advert in Adventure Probe 03/06 (June '89) advertises a rewritten version of the Atari ST version of Trials of Kronos, giving existing owners the option of replacing their copy.
Both Trials of Kronos and The Adventurer were being sold by the author in the classifieds in The One magazine, September 1989.
The Spectrum version is a two-part adventure. It's unknown if it predates the Atari ST version.
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