The late Jeremy Smith‘s all-time classic gravity game Thrust made its first appearance on the BBC Micro in 1986, through Superior Software. Jeremy soon followed up with conversions to most home computer systems.
I have a particular fondness for the Commodore 64 version, published by Firebird. There is something solid and wholesome about it.
You basically have to make your way through an underground base to find the core, to then carry it back to the surface with your craft. It’s tricky, but fun gaming. Well worth a play any day of the modern week.
More: Thrust on Wikipedia