#48 Master of Orion played on PC, released 1993
One of, if not the best turn based strategy game set in space. It had it all, 10 alien species, lots of worlds to colonize, good diplomacy, interesting tech trees and well crafted combat. It was ahead of its time. You could build your own ships with the different technologies you discover. This opened a whole world of strategy, what kind of lasers or shields to use, do I build fewer expensive heavy ships or a lot of weak fast ships to counter the different strategies of each alien race. I still feel guilty about all those planets I bombed from orbit with biological weapons. Master of Orion 2 was just as awesome with vastly improved graphics, the third one however missed the mark.