The original Amstrad CPC version is likely to have been Quilled. This version is currently missing from the archives.
The C64 port and the initial Spectrum port were created with the Quill.
There was a later, second Spectrum version produced with the PAW by Philip Reynolds of The Adventure Workshop. It can be distinguished by its black background, rather than the blue background of the Spectrum Quilled version.
Also later, an extended and enhanced Amstrad CP/M version was produced by Philip Reynolds of The Adventure Workshop, using the PAW.
The Spectrum Quilled version was re-released by Adventure Probe.
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