„X-COM: UFO Defense“ (1994 m. išleistas) yra strateginis žaidimas, kuriame valdote tarptautinę organizaciją, ginančią Žemę nuo ateivių invazijos. Žaidimas jungia pasaulinio lygio bazės valdymą, tyrimus ir išteklių paskirstymą su įtemptomis, ėjimais paremtomis taktinėmis kovomis. Jūsų užduotis – perimti neatpažintus skraidančius objektus, vystyti ginklus iš pagautų technologijų ir vadovauti karių būriams mūšiuose, kur kariai gali žūti visam laikui (permadeath). Šis derinys reikalauja nuolatinės strateginės rizikos ir taktinio planavimo pusiausvyros.
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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.