It is the year 2084. You control a secret organization charged with defending Earth from a brutal alien enemy. Build up your bases, prepare your soldiers, and lead them to victory in turn-based tactical combat.

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CaveExpress

CaveExpress

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A new game I'm working on is now available for Android.

Important update to saved games

Important update to saved games

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We've made an important change to the directory where save games are stored. If you play our latest development version (2.5-dev), read more to find out...

Monthly development report, August 2013

Monthly development report, August 2013

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This month saw a burst of activity, with bug fixes across all major systems, dramatic balancing changes to soldier advancement, improvements to the alien...

Working towards an official Debian release

Working towards an official Debian release

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Are you a Debian/Ubuntu/Mint gamer? Help apo, a member of the Debian Games Team, by testing the latest packages.

Monthly update for July, 2013

Monthly update for July, 2013

News 2 comments

Woops. I forgot to post the June update. Here's the development update for July!

Monthly updated for May, 2013

Monthly updated for May, 2013

News 1 comment

Our monthly development report. We're still making progress!

Give our server team some love

Give our server team some love

News 3 comments

We're asking for some donations for the server which hosts our website and lots of development tools we use to make the game.

Monthly update for April 2013

Monthly update for April 2013

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What we got done in April. Steady progress towards 2.5.

Monthly update for March, 2013

Monthly update for March, 2013

News 4 comments

An overview of our development progress in March. Lots of little fixes.

Monthly update for February, 2013

Monthly update for February, 2013

News 4 comments

In February, getting closer to a 2.5 release, most work was done in fixing bugs and improving existing features.

"Hive Mind" released

"Hive Mind" released

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Christy and Gary Bonn have released the first volume in their series of novels which follow the men and women of PHALANX as they battle to protect earth...

Monthly update for January 2013

Monthly update for January 2013

News 2 comments

We're gearing up now for 2.5's release. It's not imminent, but we're starting to talk about where to draw the line on features, which is always a sign...

New Issue Tracker

New Issue Tracker

News 1 comment

We have a new tracker for bugs, feature requests and patches.

Monthly update for December, 2012

Monthly update for December, 2012

News 8 comments

In December mattn finally solved the terrible multi-threading issue which was causing so much instability in 2.5-dev. It was a month full of bug fixes...

UFO: Alien Invasion Fan Fiction

UFO: Alien Invasion Fan Fiction

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Gary Bonn has written a dozen short chapters inspired by the game.

UFO: AI makes the finals in the Indie of the Year 2012

UFO: AI makes the finals in the Indie of the Year 2012

News 4 comments

IndieDB's competition enters its final round with the Top 100 games.

Monthly update for November, 2012

Monthly update for November, 2012

News 5 comments

November was a big month for the game's development. All the major pieces in the campaign rebalancing for 2.5 were completed and a load of new features...

Vote for us for Indie Game of the Year

Vote for us for Indie Game of the Year

News 6 comments

IndieDB has opened voting for the Game of the Year. Vote for UFO: Alien Invasion today.

UFO: AI on Android V2.5.0.07 released

UFO: AI on Android V2.5.0.07 released

News 4 comments

Pelya released a new version of the Android port of UFO: Alien Invasion.

The alien invasion will not be tweeted

The alien invasion will not be tweeted

News 5 comments

Random notes from our developers, however, will be tweeted. So follow us @ufoai for updates as we work on finishing version 2.5.

Sourceforge Project of the Month - Vote Now

Sourceforge Project of the Month - Vote Now

News 5 comments

Vote for us to be named Sourceforge's Project of the Month for December.

Linux Game News chose UFO: Alien Invasion as the best open-source game

Linux Game News chose UFO: Alien Invasion as the best open-source game

News 5 comments

Linux Game News chose UFO: Alien Invasion as the best open-source game in their turn-based strategy category.

New Aliens

New Aliens

News 4 comments

The UFO:AI development team is proud to announce that new aliens arrived on the battlefield!

Improved Air Combat

Improved Air Combat

News 6 comments

The UFO:AI development team is proud to announce that we made the first steps towards a new improved air combat system.

New soldier models & UI Update

New soldier models & UI Update

News 2 comments

The UFO:AI development team is proud to announce that we have finally merged the new soldier models into 2.5-dev version.

News Update

News Update

News 2 comments

The UFO:AI development team is proud to announce the launch of the UFO:AI Facebook page. Its the first step of our new marketing measures - please like...

2.4 Released

2.4 Released

News 6 comments

The UFO: Alien Invasion development team is proud to announce the release of UFO:Alien Invasion version 2.4.

Interview with the "UFO:AI" team~

Interview with the "UFO:AI" team~

News 4 comments

Join mattn and geever, the lead programmers for "UFO: Alien Invasion", as they share their experience about working on this free open-source game, overcoming...

Android port available in market

Android port available in market

News 4 comments

UFO:Alien Invasion (2.4-dev) Android port available in market

Particle Effects Video

Particle Effects Video

News 3 comments

The UFO:AI Developement Team has released a Video that demonstrate some of the new sound and particle effects which will be featured in Version 2.4