

During the player's turn the troops can be ordered to move around, fire their weapons, throw grenades or use other equipment. Tactical mode uses a turn-based system, where the human team and the aliens take turns to make moves. Instead of pushing impersonal armies around on giant maps, the players uses only the team of soldiers assigned to deal with this mission (as of 2.4, the maximum number of player-controlled actors is 8). In Tactical mode, the player takes command of a team of soldiers in various missions to combat the aliens wherever they might appear. The player receives money from supporting countries (based on effectiveness at dealing with aliens in their area) monthly, but the majority of the money comes from selling loot like alien weaponry or materials collected from successful tactical missions. All items in the game, ranging from weaponry to alien building materials take up space and need storage facilities. The player can build additional facilities (provided they have enough base space) and hire employees (provided they have enough living space) to increase the speed of production, research, or to replace soldiers lost in combat. Research will progress and items will be produced as time passes. Geoscape mode employs easy-to-use time buttons to control the passage of time, automatically pausing whenever there's an important message. The player can build, buy and produce anything available, as long as technology level and budget will allow it.

Interceptor aircraft can be launched to shoot down UFOs and dispatch dropships in response to alien activity across the globe. Once researched, new technologies may be used in battle against the aliens. The player directs the activities and finances of PHALANX, controlling bases, installations, aircraft and squads of armed-response troops. Geoscape mode deals with base management and strategy. Like the original X-COM games, UFO:AI has two main modes of play: Geoscape mode and Tactical (also known as Battlescape) mode.

The game aims to combine military realism with hard science-fiction and the weirdness of an alien invasion and the turn-based system is supposed to give the player pin-point control of his/her squad while maintaining a sense of pace and danger.
UFO ALIEN INVASION GAMEPLAY SERIES
However, it's neither a sequel nor a remake of any X-COM or other commercial title: "What we as a team wanted to make is a brand new experience that tries to surpass the quality of games from 1992, rather than simply recreate them with flashier graphics." UFO: Alien Invasion is a squad-based tactical strategy game in the tradition of the classic X-COM series of games (the player controls a secret organization charged with defending Earth from a brutal alien enemy). The game takes a lot of inspiration from the X-COM series by Mythos Games and MicroProse. Currently, version 2.5 is the latest stable version (released June 28, 2014). The first version was released on 30 December 2003.
UFO ALIEN INVASION GAMEPLAY SOFTWARE
Licensed under the GNU General Public License, UFO: Alien Invasion's engine is free software and its artwork is distributed under various open source licenses.
