X-COM: UFO Defense
Now that aliens have invaded the Earth X-COM: Enemy Unknown presents the player with 2 distinct challenges.
In the Geoscape section, strategic skills are stretched to the limit: finite resources have to be allocated to establish bases across the globe, and the world's governments have to be kept happy.
In the Battlescape section, you fight the aliens in the air and every so often will get the chance to deploy troops and vehicles against a crash-landed alien craft in an attempt to salvage alien artifacts that can be used to enhance your weapons systems.
A fine mix of strategy and turn-by-turn wargaming, enhanced by animated transition sequences.