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Sid Meier's Alpha Centauri™ Planetary Pack
Sid Meier's Alpha Centauri™ Planetary Pack includes the original Alpha Centauri and the expansion, Alien Crossfire.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-13.
What reviewers agree on
28 of the 70 reviews raise this.
“The best Civ game ever made. Play as Deirdre so you can kill everyone with MIND WORMS and listen to spooky new age music. She's also very easy to look at. Apart from being a sci-fi game with its own special rules,…”
“secretly the best civilization game, and certainly one of the all-time greatest 4x games. i've loved it since 1999 and i still love playing it. alpha centauri has what modern civ and its pretenders lack - actual FLAVOR…”
“This '99 strategy game is scary. From the point of all newer games of its kind, I mean. Years pass but very few are this competent chess partners. (I have the Steam version for just practical reasons. My playing hours…”
16 of the 70 reviews raise this.
“The best Civ game ever made. Play as Deirdre so you can kill everyone with MIND WORMS and listen to spooky new age music. She's also very easy to look at. Apart from being a sci-fi game with its own special rules,…”
“secretly the best civilization game, and certainly one of the all-time greatest 4x games. i've loved it since 1999 and i still love playing it. alpha centauri has what modern civ and its pretenders lack - actual FLAVOR…”
“Finding Sid Meier's Alpha Centauri on Steam was an instant nostalgia hit for me. I spent so many happy hours playing this back in the 90s, and jumping back into it felt like reconnecting with an old favorite. The…”
6 of the 70 reviews raise this.
“Endless replayability and educational. Still one of my favourite RTS games of all time.”
“played this game for hours on end as a kid, revisit it constantly. nothing quite satisfies like it. i cannot beg friends enough to play it with me but have yet to scrounge a multiplayer game. maybe some day”
“Great RTS with almost endless replayability”
3 of the 70 reviews raise this.
14 of the 70 reviews raise this · 8 of them still recommend the game.
“I love this game, but it won't run on my windows 11 PC. Therefore I cannot reccommend until fixed. Games shouldn't be allowed to be sold here if they aren't current enough to run on the current hardware/software. Edit:…”
“secretly the best civilization game, and certainly one of the all-time greatest 4x games. i've loved it since 1999 and i still love playing it. alpha centauri has what modern civ and its pretenders lack - actual FLAVOR…”
3 of the 70 reviews raise this · 3 of them still recommend the game.
“secretly the best civilization game, and certainly one of the all-time greatest 4x games. i've loved it since 1999 and i still love playing it. alpha centauri has what modern civ and its pretenders lack - actual FLAVOR…”
“Important: Install some overhaul mode like Thinker for example and don't play it as is on Steam. It's legendary game indeed, but it aged like milk, especially on UI and graphical compatibility front. Other then that,…”
“This has the best writing of any 4x game I've ever played. Gives you something to think about as you play. The emergent narrative is fairly strong, especially since the ai leaders actually converse with you in a human…”
3 of the 70 reviews raise this · 2 of them still recommend the game.
Counted across 70 English reviews, sampled to match this game's 90.4% positive rating · as of 2026-05-13
“I’ve been playing this game on and off since 1999, and honestly, nothing else comes close. I still remember the first time I heard Chairman Yang’s voice talking about "Recycling Tanks" as a kid and thinking it was just a cool building, only to realize years later as an adult the…”
— a player, Steam review · 2 hrs played“Firaxis published the best-written strategy game to ever exist and the only Civ game that isn't explicitly and aggressively pro-colonialist and then said "Let's never ever do that again" I am also disappointed but not surprised to see that a third party mod pack makes the…”
— a player, Steam review · 13 hrs played“"I sit in my cubicle, here on the mother world. When I die, they will put my body in a box and dispose of it in the cold ground. And in the million ages to come, I will never breathe, or laugh, or twitch again. So won't you run and play with me here among the teeming mass of…”
— a player, Steam review · 12 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-25. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-13.
| Genres | Strategy |
| Player tags | Strategy · 4X · Multiplayer · Singleplayer · Space · Turn-Based Strategy · Sci-fi (SteamSpy community voting) |
| Features | Single-player · Multi-player · PvP · LAN PvP · Steam Cloud · Family Sharing |
| Languages | English * * |
Minimum system requirements (PC)
Minimum: OS *: Windows XP / Vista / 7 / 8 / 10 Processor: 1.8 GHz Memory: 512 MB RAM Graphics: 3D graphics card compatible with DirectX 9.0c DirectX: Version 9.0c Storage: 600 MB available space Additional Notes: Requires a monitor that supports a minimum resolution of 800x600