It was published by Zenobi Software initially and then later sold on Tony Collins' own The Guild label.
An improved and expanded Methyhel - The Special Edition Spectrum 128K edition was produced in 1991. It combined both parts of the Spectrum 48K game, removing the graphics and unused locations, but improving gameplay and adding more puzzles. It was initially available for free, due to a dispute between Tony and Zenobi, before he bought back the rights to Methyhel and sold the game himself.
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