Having reached critical mass in the skies, the spores begin to rain down, and over the course of several days, begin to clog the streets and bodies of water, smothering people in their homes, and burying animals in the wild. During the "Nightfall", as it would come to be called, most of the higher life forms on the earth were wiped out.
During the Twilight, all human responses were futile. Choosing caution over aggression, the governments of the world didn't realize how quickly the end could come, and were buried alongside those that they governed. A few, however, did survive, sealed in underground bases with stocks of food and oxygen. After several weeks, the spores seemed to have disintegrated, decomposing and settling into the soil. The world seemed safe again, for a time. This is where the player comes in: you must gather together the remaining peoples of the planet, find out what has happened, and, if possible, get your revenge.
GameplayWith its roots deeply in the X-COM series, the game combines elements of strategy with squad-based tactics. The game therefore consists of two separate parts which are played alternately: A strategy phase in which the player controls and expands his organization, and a tactical phase in which player-controlled units do battle with alien enemies.
The strategic phase allows the player to outfit his/her troopers for action, acquire new equipment and personnel, and conduct research to enable the production of more advanced equipment. Mission markers pop up on the globe indicating locations where a team can be dispatched to do battle. Winning or losing a battle may have the effect of expanding the player's territory, allowing more access to resources which enable further expansion. This is much in line with the X-COM strategic mechanics.
The tactical game can be described as pause-based real-time combat. All combatants on the tactical battle area move and act simultaneously, rather than using turns. The player can pause time (or tell the game to automatically pause on certain events), and issue orders to his/her troopers, which will only be carried out once time is unpaused. Also in deviation from the X-COM series, the battlefield is presented in fully rotatable 3D, and as such dispenses with the technical limitations of isometric view.
It's a pretty good game just don't get too attached to your soldiers or you can try playing it on the easiest setting. And hey its pretty cheap over at GOG. http://www.gog.com/en/gamecard/ufo_aftermath