This is the hidden Map of the Sinclair-Spectrum-Gem "Zombie Zombie" (1984). Kudos to Sandy White & Angela Sutherland (who wrote the Game) and Carles Oriol who wrote the Python/OpenSCAD-Scripts (as mentioned in my (german) [Blog](http://zeuk.blogspot.de/2015/12/der-wahre-mindcraft-erfinder_26.html "ZEUK")).
![](http://www.vgmuseum.com/end/zx/a/zombie2x-1.png)