Unofficial ports exist for the Amstrad Notebook by Timothy Surtell, the BBC by an unknown author and the TRS-80 MC-10 by Jim Gerrie. The game has been unofficially ported to the Amstrad CPC by Carsten Dost (SRS).
There is also a Quilled version for the Spectrum ZX by Arjun Nair.
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Amstrad CPC version: https://www.cpc-power.com/index.php?page=detail&num=12769