Game features:
It’s a monster massacre! - With more than 10,000 aliens on each map and up to 100 simultaneously on your screen, you’ll have plenty of opportunity to show ‘em who’s boss.
Climate change - Walk through water, slog through fog and be sure to carry an umbrella! Newly added weather conditions naturally occur throughout the game to keep you on your toes and immersed in the action.
New weapon upgrades - Over 50 types of weapons allow you take out aliens with panache. Shoot, burn, freeze or shrink them!
Gadgets galore - Pick up more than 20 kinds of useful tools to help you in the fight against the alien horde, including flash lights, med kits, radars and battle drones.
New modes to enjoy - Check out 17 unique missions in Campaign mode or explore 3 variations of Survival, including “Gun Stand” and “Stand Firm.”

System requirements:
Windows XP/Vista
DirectX 9
1.7 GHz
512 MB RAM