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Source Port Freeware

UFO: Alien Invasion

About this entry

UFO: Alien Invasion is a free, open-source tactical strategy game heavily inspired by the classic X-COM series. Set in the year 2084, players command PHALANX, a secret organization tasked with defending Earth from an alien invasion. The game features two distinct modes: Geoscape Mode for real-time strategic management (base building, research, interception) and Battlescape Mode for turn-based tactical combat in 3D environments. It is built on a heavily modified version of the Quake II engine and is available on multiple platforms.

UFO: Alien Invasion is listed as a Open Source entry in CheckpointDB's preservation database.

It is grouped under Strategy|Resource Management, making it easier to compare with related preservation projects and enhanced classics.

This record is treated as its own version or project, separate from normal game database entries.

Features

Indie GameStrategyOpen Source

Notes

Setup: Available as a free download for Windows, Linux, and macOS.