The BBC Micro version was published in the book BBC Programs Volume 1 (pp.93-105) by Gerald Duckworth & Co Ltd in 1984; programs by Carl Graham and edited by Nick Hampshire. Here it states that the original version was for the PET.
An Electron version was also published in the 1985 Duckworth book Electron Programs, edited by Nick Hampshire with programs by Carl Graham.
The game is available in Swedish.
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