I absolutely love the first UFO: Enemy Unkown since it came out in the 90s. I did play this sequel as well but strangely enough, I never finished the game. It's a lot tougher than its predecessor and slightly less fun because of that. Especially the terror missions. I hate those. :-) Still worth playing though. I experienced some performance issues though. The game runs very slow and there is not much you can do about it if you want to play it through GOG Galaxy. The solution is using your own DOSBox instead. But you'll probably need to decrease the cycles to slow the game down for a change. Even at the lowest the scrolling will probably be a little faster than you'd like but it's definitely managable. The game runs much much smoother that way.