Join our Discord to chat with fellow friendly gamers and our knowledgeable contributors!

Not an American user?


Sid Meier's Alien Crossfire is an expansion pack to Alpha Centauri. It adds seven new factions, two of them the aliens who left Planet before the humans arrived, new technologies, new city structures, and new units.

The two new alien races are radically different from any other human faction, right down to the unit art. The player can mix and match any seven factions from the expansion pack and the original game, but the aliens have to go together or not at all. The other four human factions include a seafaring race, and an even more zealous environmental race then the original Gaians.

There is also a handy Faction Editing tool included, for all your editing needs!


Sid Meier's Alien Crossfire Windows Bossing your troops around
Sid Meier's Alien Crossfire Windows BOOM!
Sid Meier's Alien Crossfire Windows Politics are so boring
Sid Meier's Alien Crossfire Windows Let's bust some planets!

Promo Images

Sid Meier's Alien Crossfire Screenshot The start screen
Sid Meier's Alien Crossfire Screenshot Jewel Case: Back
Sid Meier's Alien Crossfire Screenshot Many options on the main menu are disabled
Sid Meier's Alien Crossfire Screenshot Jewel Case: Front

Alternate Titles

  • "SMACX" -- Common abbreviation
  • "Sid Meier's Alpha Centauri: Alien Crossfire" -- European title

Part of the Following Groups

User Reviews

Must have? Don't think so. Windows Technocrat (201)
I will officially THUMP the idiot programmer who did the custom map programming Windows Indra was here (20902)

Critic Reviews

ESC Magazine Windows Nov 15, 1999 10 out of 10 100
GamePro (US) Windows Jan 01, 2000 4.5 out of 5 90
GameStar (Germany) Windows Dec, 1999 88 out of 100 88
Retro Archives Windows Mar 16, 2019 17 out of 20 85
Gamer's Pulse Windows 2000 85 out of 100 85
RealGamer (Benelux) Windows Jan, 2000 8.5 out of 10 85
GameSpot Windows Nov 24, 1999 8.3 out of 10 83
Computer Gaming World (CGW) Windows Jan, 2000 4 Stars4 Stars4 Stars4 Stars4 Stars 80
Mac Ledge Macintosh May 24, 2000 4 out of 5 80
PC Player (Germany) Windows Dec, 1999 80 out of 100 80


Topic # Posts Last Post
April 2010 Game of the Month: "Jihad" 1 bdanv
May 19, 2010


There is no trivia on file for this game.

Contributed to by Dr. Elementary (297) and Zeppin (8409)