Your aim in UFO: Alien Invasion is to fight the forces of evil in a world that has turned over a leaf in the next stage of it's evolution.
While war and famine have been virtually eradicated, one major threat remains hanging over mankind - the threat of alien invasion. UFO: Alien Invasion is a free game rich in background history and strategy. You have to lead a crack commando team to destroy and investigate the increasingly dangerous extraterrestrial technology which threatens to wipe out the human race. The game takes the shape of a strategy/shoot-em-up action based thriller which requires a certain amount of guile and map reading ability as well as a quick trigger finger. The missions are incredibly well thought out and rich in detail and although the graphics aren't exactly stunning, there are some excellent special effects. It's easy enough however to pick up pretty quickly although to get the most out of the game, you'll have to consult the Wiki which has extensive details of the how to play.
A very well designed and thought-out game that, considering it's completely free, will thrill any UFO enthusiast or strategy game fan.