Sid Meier’s Alpha Centauri

Legendary designer Sid Meier presents the next evolution in strategy games, with the addictive gameplay. Explore the alien planet that is your new home and uncover its myriad mysteries. Discover over 75 extraordinary technologies. Build over 60 base upgrades and large scale secret projects for your empire. Conquer your enemies with a war machine that you design from over 32,000 possible unit types. Included with Sid Meier's Alpha Centauri is Alien Crossfire Expansion Pack. It adds seven new playable factions, new technologies, new secret projects, new base facilities, new weapons, armor, special abilities and an expanded storyline.

Minimum system requirements: 

CPU: 133 MHz (x86, alpha or powerpc compatible)
RAM: 32 MB
GPU: A display = 1024x768
HDD: ~600 MB