Nexor (UK) (1986) - Amstrad CPC - Puzzle, Sci-Fi.

This is an exploration game which is viewed in an isometric perspective. In the war between Andromeda and Earth, a top secret weapon named NEXOR, after the planet it was developed on, is to be deployed by Earth's forces. However, the Andromedans have infiltrated the base and killed all of its workers, except you. You have three hours to find the ten pieces of the weapon and the blueprints, and send them to Earth using the matter transference beam, but you'll need to fix it first.