Published in the translated version of The ZX81 Pocket Book; Das ZX81 Buch published by Hueber Software.
At least two versions exist for ZX Spectrum; presumably later "unofficial" ports. One version of the type-in archived has enhancements by Rainer Steinbrecher.
There is a Robotron KC version of the game, usually tagged with the date 1988 and the publisher Rothe. The history of this version is unclear.
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