No. 81: Alien - Mindgames, 1984
Alien was a hugely ambitious attempt to create a unique survival horror game on the Speccy. Your mission was to guide the crew to safety, either by eluding or killing the titular beast, and it was no easy task. Featuring a simplified emotion level for each character and some genuinely nerve-wracking moments, there is little else like Alien on the Spectrum.
For more info check out my making of Alien!
Thanks to www.spectrumcomputing for images!