Impresive, adictive, scary. Not even matched yet!
You run an organization subcided by countries all over the world to control the UFO activities on earth. At the begining you just count with one base, an interseptor and a transport ship, a few low trained soldiers, some guns and a lot of hope. The radar you have is a short range one, so several days may pass until you detect an UFO passing by. (the time can be from days passing to almost realtime, and paused).
The first encounters will be easy to deal with, small UFOs with few crew on it. Once you dealed with it on the air the interesting part comes to pass, where you can send your transport ship with your inexperienced soldiers to explore the remainings on the crash site, confronting the aliens that survived the crash and collecting new artifacts that you may study and later use and manufature yourself.
As time keeps moving your performance will determine the budgets you will receive, to improve this you can expand yourself creating more bases, new base moludes to extend your range of control, renew your weapons, armor, ships.
There is a critical mission almost once every month, "alien terror". The aliens atack a city which you must defend. Be prepared for a lot of aliens will be found there, so load your weapons and take the best of your soldiers. You must save as many citicens as you can to succeed.
The budget is another interesting point of this game. Besides the income from the countries, you can sell any item you have in store, even if you manufacture it, so it is a good idea to keep your engineers building something you may or may not use to sell them, there is always a proffit, choose well.
The game keeps you wanting more at all time since everything your scientists discover, is not only interesting but opens new concepts and technology, also learning about the creatures gives you atvantages.
Over time your soldiers will improve their stats, which is very complete, you will expand, have new ships, new technology to battle this menace, and eventually find out that the aliens are ploting with some nations, they will retire from the proyect, which will afect your budget, and after an interrogation of some live aliens you may capture, you will find Alien bases on earth.
Atacking this bases will proove to be a chalenge and will provide you of a lot of alien stuff.
Interrogating high rank aliens will provide you the location of the main base, on mars, you will find out that the only way to stop this maddness will be going there and finishing them on their own ground.
A hell of a turned-based strategy game. No game of the tipe got even closer to it, not even today. It will keep you glued to the computer, always wanting to find more, better your performance, train your soldiers in missions.