Sid Meier's Alpha Centauri

From PCGamingWiki, the wiki about fixing PC games
This page may require cleanup to meet basic quality standards. You can help by modifying the article. The discussion page may contain useful suggestions.
Sid Meier's Alpha Centauri
Sid Meier's Alpha Centauri cover
Firaxis Games
Mac OS (Classic) Aspyr Media
Linux Loki Software
Electronic Arts
Mac OS Aspyr Media
Linux Loki Software
Release dates
Windows February 12, 1999
Mac OS (Classic) February 2000
Linux August 2000
macOS (OS X) January 24, 2013[1]
Sid Meier's Alpha Centauri guide at StrategyWiki
Sid Meier's Alpha Centauri at Wikipedia

General information

Official Website - Active Alpha Centauri modding, patching and multiplayer community. Perhaps the last on the web.
Civilization Wiki - A detailed wiki for all Civilization games and their spin offs
Apolyton Civilization Site's Alpha Centauri section - A huge forum dedicated to all Civilization games and their spin offs. Community Discussions Support Page


Source DRM Notes Keys OS
The game will run without the CD if you have performed a full install. SecuROM DRM otherwise.
Mac OS
Sid Meier's Alpha Centauri Planetary Pack.
macOS (OS X)
Icon overlay.png
Sid Meier's Alpha Centauri Planetary Pack includes the base game and the Alien Crossfire expansion

Downloadable content (DLC) and expansions

Name Notes
Sid Meier's Alien Crossfire Included with Sid Meier's Alpha Centauri Planetary Pack.
Mac OS

Essential improvements[edit]

In-game general settings.
In-game general settings.
In-game advanced settings.
In-game advanced settings.


The version already has the official patches, but you should strongly consider installing an unofficial patch.

Unofficial Patches[edit]

The original .exe is filled with exploits and prone to crashing. The patches below will fix the vast majority of crashes and bugs.
  • Yitzi's patch (SMAX only) - Built on kyrub's SMAX patch and yitzi's patch, and contains even more fixes. v3.4 includes PlotinusRedux's PRACX graphical patch, but you need to install PRACX separately as it wasn't packaged properly.
  • kyrub's patch (SMAC, SMAX version not recommended) - Aimed primarily at improving AI performance but also fixing some bugs. SMAX version has only minor AI improvements and is superseded by Yitzi's patch.
  • scient's patch (SMAC and SMAX) - Fixes bugs, crashes and exploits and includes text file improvements.

Recommendation: You should install Yitzi's patch if you're using SMAX and either kyrub's or scient's if you're using SMAC.

Yitzi's patch breaks backwards compatibility for alphax.txt. If you use old scenarios that require a custom alphax.txt this means that you may need to manually move the changes over. This will not be a concern for most users. Not using Yitzi's patch means that some newer scenarios and custom alphax.txt will not work for you.

To use any patch, extract the zip file into the installation folder and overwrite the existing files.

The patches' AI improvements won't make the AI too hard for new players, and instead aim for a reasonable level of challenge at "Librarian" difficulty. Tweaks mostly involve teaching the AI how to do not-terribly without cheating.

Patches are primarily developed on the Alpha Centauri 2 forum.

Game data[edit]

Configuration file(s) location[edit]

System Location
macOS (OS X)
Mac OS (Classic)
It's unknown whether this game follows the XDG Base Directory Specification on Linux. Please fill in this information.

Save game data location[edit]

System Location
Windows <path-to-game>\saves
macOS (OS X) ~/Library/Application Support/ Meier's Alpha Centauri/saves
Mac OS (Classic)

Save game cloud syncing[edit]

System Native Notes
GOG Galaxy

Video settings[edit]

In-game audio/video settings.
In-game audio/video settings.

Widescreen resolution[edit]

Try PRACX, a modified renderer for Alpha Centauri with a number of other improvements. v1.06 is included in version 3.4 of Yitzi's Unofficial Patch, but lacks an essential file and won't work properly unless you've already installed PRACX. You should probably install PRACX separately from its release thread. PRACX Release Thread. PRACX Source Code

PRACX + Official Alien Crossfire doesn't work, you need to install an unofficial patch first. Yitzi's 3.3 patch has been tested to work.

Edit Alpha Centauri.ini[citation needed]
  1. Go to the installation folder.
  2. Open Alpha Centauri.ini.
  3. Add DirectDraw=0 under [Alpha Centauri]
  4. The game will now run at your desktop-resolution

Input settings[edit]

Keyboard and mouse Native Notes
See the glossary page for potential workarounds.
Mouse acceleration
Mouse sensitivity
Mouse input in menus
Mouse Y-axis inversion
Controller support
See the glossary page for potential workarounds.

Audio settings[edit]

Audio options Native Notes
Separate volume controls
Surround sound
Closed captions
Mute on focus lost
EAX support
EAX support was added with 2.0 update[2]


Language UI Audio Sub Notes
German version is English only. German text/audio/video files have to be copied over from the retail version. Due to game values and display texts being in the same file, many unofficial patches will overwrite German retail files.


Multiplayer types

Type Native Players Notes
Local play
Hot seat
Requires the v2.0 Update or later.[3]
LAN play
Online play

Issues fixed[edit]

The game hangs[edit]

Try the latest copies of Yitzi or kyrub's patches.

Otherwise, might be related to a bug with automated artillery units (though I think Yitzi might have fixed this one sometime). Try turning off automation and see if it helps. More info here.

AMD/ATI compatibility[edit] recommends using Catalyst 13.4 or earlier but the game also works with 14.x or earlier.

Other information[edit]


Technical specs Supported Notes
64-bit executable

System requirements[edit]

Minimum Recommended
Operating system (OS) 95, 98
Processor (CPU) Intel Pentium 133 MHz Intel Pentium 200 MHz
System memory (RAM) 16 MB 32 MB
Hard disk drive (HDD) 60 MB
Video card (GPU) 2 MB of VRAM
macOS (OS X)
Minimum Recommended
Operating system (OS) 10.6.8
Processor (CPU) 1.8 GHz
System memory (RAM) 512 MB 1 GB
Hard disk drive (HDD) 2 GB