As a seminal 1994 strategy main game, you lead an international organization defending Earth from alien invasion via two layers: global base management, resource allocation, and research, alongside intense, turn-based tactical squad combat. Distinctive features include permadeath for soldiers and the necessity of reverse-engineering alien tech to advance defenses. The core loop involves balancing strategic infrastructure upkeep with high-stakes ground missions against escalating threats.
The gameplay operates on two distinct, interconnected layers. The strategic layer involves managing the entire defense infrastructure from a global perspective. Players must establish and expand underground bases, allocate funding from various Earth nations, and oversee the research and development of new weaponry derived from captured alien technology. Crucially, this layer involves monitoring global activity to intercept incoming Unidentified Flying Objects (UFOs) using interceptor craft.
The second layer is the tactical combat mode. When an interception is successful or an alien base is located, players deploy small squads of highly trained soldiers into turn-based battles. These engagements require meticulous positioning, management of limited ammunition and supplies, and careful use of cover. A significant element of tension in these missions is the concept of permadeath, meaning soldiers lost in battle are permanently removed from the roster, forcing players to constantly train replacements and value their veteran units.
The unique appeal lies in the constant tension between strategic necessity and tactical risk. Success in research unlocks superior gear, which is essential for surviving harder tactical missions, yet every mission risks losing the experienced personnel needed to execute those missions effectively. Furthermore, the game incorporates an element of global political management, as failing to defend certain nations can lead to them withdrawing support, further complicating the defense effort.
The game establishes a tense atmosphere of global crisis. As the alien invasion progresses, the nature of the threat evolves, forcing players to adapt their entire defense doctrine. The setting is grounded in a near-future scenario where humanity is suddenly confronted by technologically superior invaders, demanding rapid innovation under extreme pressure.
Progression is tied directly to technological acquisition. Recovered alien artifacts and captured alien lifeforms are subjected to rigorous scientific study. Successfully completing research projects unlocks new armor, energy weapons, and defensive countermeasures, directly influencing the player's ability to handle increasingly difficult alien encounters across the globe.
This main game release does not include any official downloadable content (DLC) or expansions. It was initially available on platforms including DOS, PC (Microsoft Windows), Amiga CD32, PlayStation, and Amiga. The core experience remains focused on the strategic management and turn-based tactical combat loop established at its release.

This megamod will allow you to grow X-Com from its humbled beginnings, as a two-men team travelling the world in an expensive-looking car to global the military force we all know and love. It contains many, many additions, like new mission types, enemies, equipment and story arcs (including the entirety of my previous project, the Final Mod Pack). It also places the game a bit more firmly in the 90's conspiracy genre and its clichés.

The campaign begins with the player having to defend the X-Com base from an assault of the Men in Black. Then you will need to assess the situation and learn how to use the new opportunities. Many aspects of game mechanics and balance have been changed, giving a fresh experience. However, the gameplay and visual design remain in the spirit of the classic 1994 game.

X-Piratez is a total conversion mod designed for OpenXcom, a free open-source re-implementation of X-Com: Enemy Unknown (1994) and Terror From The Deep. There are major gameplay differences, as well as many additions to research, manufacture, base facilities, and so on. Piratez is designed for the veteran X-Com player seeking a much longer and challenging campaign.

Open-source clone of the original UFO: Enemy Unknown / X-Com: UFO Defense by Microprose.

XCOM: Enemy Unknown will place you in control of a secret paramilitary organization called XCOM. As the XCOM commander, you will defend against a terrifying global alien invasion by managing resources, advancing technologies, and overseeing combat strategies and individual unit tactics. The original XCOM is widely regarded as one of the best games ever made and has now been re-imagined by the strategy experts at Firaxis Games. XCOM: Enemy Unknown will expand on that legacy with an entirely new invasion story, enemies and technologies to fight aliens and defend Earth. You will control the fate of the human race through researching alien technologies, creating and managing a fully operational base, planning combat missions and controlling soldier movement in battle.