X-COM named IGN'S #1

quote IGN

It may be old as hell and you may have to actually disable DirectDraw to get it to run these days but there's still no PC game that can compete with the mighty X-COM. Conceptually it's one of the finest strategy games to ever appear on any system. Putting the player in charge of a worldwide defense against an alien invasion, the original X-COM combined elements of sophisticated base management, high-tech research, engaging roleplaying, thrilling tactical combat and a tense, terrifying story to create an experience that has yet to be duplicated by any other game. Leading your squads on missions to reclaim crashed UFOs or fighting house to house in an effort to repel alien terror attacks on major cities throughout the world were the highlights of the game but X-COM has plenty of other pleasures in store, from juggling personnel and equipment to keeping the nations of the world happy enough to sustain your budget. Simply put, there's no excuse for strategy fans not to break this one out and play through it again.