A most painful experience. Not sure I will ever finish the game. If you're serious about playing it then read or watch as much as you beforehand. Otherwise you'll probably have to restart it half a dozen times in order to succeed. Imo this game was never really finished. It gives almost zero explanation on what to do when and how. Have fun! PS: I'm a big fan of the original UFO and I love turn-based strategy (btw the RTS option here turns the game into a total mess) so it's certainly not the concept or genre.
I wonder if I'd enjoyed this as a kid. As an adult it's almost unplayable - and proof of how hard it is to make an adventure game based on logic and reasoning. Here (as in many other cases) they just threw in tons of trial & error as well as items no one needs. So get ready to spend most of your game time going through the motions... until you consult a walkthrough. Kinda crazy that they were able to charge money for something like this back in the day...