1994年発売の本作は、地球外生命体による侵略から人類を守る戦略シミュレーションです。ゲームは、基地建設、資源管理、技術研究を行うグローバル戦略層と、エイリアンとの遭遇時に展開するターン制の戦術戦闘層の二層構造で進行します。プレイヤーは部隊を率いて戦い、捕獲した技術を解析して兵器を開発しますが、兵士のロストは永続的(パーマデス)であり、常に緊張感が伴います。戦略的な深さと、リスクを伴う戦術的決断が特徴です。
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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.