

The game has been re-released as part of the compilations X-COM Collector's Edition by MicroProse in 1998, X-COM Collection by Hasbro Interactive in 1999, X-COM: Complete Pack by 2K Games in 2008 and 2K Huge Games Pack in 2009.
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On, the game was distributed on Steam by 2K Games, who has inherited the franchise (first only for the Windows XP, but a later update which enabled Windows Vista support). In 1998, a Windows 95 port was released with UFO Defense as part of the X-COM Collector's Edition. It was ported to the PlayStation in 1996.
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X-COM: Terror from the Deep was originally released on 1 June 1995 for the PC DOS. Also, by not inventing any new game features or game technology it would make the scheduling one largely led purely by asset creation – which makes it whole lot easier when it comes to estimating task durations and scheduling." Simultaneously with making the console port of Terror, MicroProse UK also began work on their X-COM project. By keeping changes to the absolute minimum a sequel could be created in just a few months. MicroProse artist Terry Greer recalled: "A decision was made to use the original engine, reskin the graphics and create a whole new story.
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Eventually, MicroProse licensed Mythos' code and their internal UK studio created Terror from the Deep within a year, while Mythos Games began developing the next sequel, Apocalypse. Julian Gollop felt that the only way to do so was to change the graphics and make minor changes to the gameplay. MicroProse wanted the developer Mythos Games to make a sequel to UFO Defense in six months. Destruction of T'Leth by the player results in victory but also accidentally results in another worldwide environmental cataclysm, destroying the ecosystem of Earth and setting the stage for the third game in the series, X-COM. X-COM, which had been disbanded after the first alien war, is revived by the Earth's governments to fight this new menace as the aliens' ultimate goal is to reawaken their supreme leader, a being that cannot be stopped once revived.Įventually, it is revealed the aquatic aliens, cousins of the Sectoids from UFO Defense, came to Earth on a massive spacecraft, known as T'Leth, that crashed into what is now the Gulf of Mexico 65 million years ago, causing the extinction of the dinosaurs. After awakening, the aliens proceed to terrorize seagoing vessels and port cities, kidnapping humans to perform bizarre genetic experiments on them. Following the destruction of the alien Brain on Cydonia, a transmitter remained active there which awakened a group of aliens under the Earth's seas who had lain dormant for millions of years. Terror from the Deep is set in 2040, four decades after the events of UFO Defense. A new feature added in TFTD was melee weapons, thanks to feedback from the players who suggested the idea. A part of the reason for the enhanced difficulty is that players complained of the first game being too easy, however MicroProse were unaware that this was due to a bug that resulted in it reverting to Beginner mode in the released version. Aside from lengthy multi-part missions, map layouts are more complicated, there are several types of terror missions, and weapons carry fewer rounds in their magazines.ĭifficulty levels were markedly increased compared to UFO Defense. The game features some mission types composing of multiple parts, such as alien shipping route terror attacks in which the first part is a battle of the upper floors of the ship while the second part takes places in the lower decks of the ship (all parts must be completed for these missions to be successful, and soldiers lost in previous parts do not appear in later parts). Underwater battles use the same physics as the ground ones but certain weapons cannot be used on surface/land missions. The second part, the BattleScape, is used for combat between squads of aliens and humans, and takes the form of a turn-based battle from an isometric view. The first is the real time-based GeoScape, a global view of Earth where the player views alien and X-COM craft and bases, can hire and dismiss staff, buy and sell vehicles, weaponry, ammunition and items, and build and expand bases. Just like X-COM, the game consists of two parts. This is also used as a plot device all of the alien technology from the first game is unusable in salt water, forcing the player to capture and develop new technology. X-COM: Terror from the Deep takes place mostly underwater, with base-building and combat all being submerged beneath the waves.
