A great stand alone expansion to a great game.
In this one, you will play as Psycho, another member of the team which have been sent to retrieve an alien's container.
Like its predecessor, this game put you against the Koreans and aliens. In this one, the combat will be more mixed between aliens and Koreans. It will not be against only one or the other clan. That will occur sometimes where you will see both fighting at each other. That will be a good opportunity for you to run aside from the fight.
The campaign last 7 missions and is good for about 10 hours. The difficulty is quite hard on Delta difficulty, which is the highest one. In some cases, I would want to throw my controller away since it just seemed impossible. However, the tip is really to save often and use your cloak ability as often as you can. The last mission is without any doubt the hardest one. Save often!
Fortunately, the controls were a bit changed if you use a gamepad. They are really more classic than in the original game, so that makes the game a bit easier.
Globally, this is a pretty good extension if you liked the original game. If you did not played it, you can buy this stand alone and expect some good time.