X-COM: Assault focuses on the combat side of the game. In this game, you control one of two forces in an effort to wipe out the other in 300 turns. It was designed to be a single-player scenario, with the player controlling the X-COM forces against the numbers disadvantage.
The X-COM start with three cities: The Judge, The Jury, and The Executioner. These cities provide minimal food, shields, or trade, due to the unimproved terrain and the poor city locations for growth, so new units cannot be built in reasonable time. All three cities also have Training Centers (Barracks), allowing any new units to be veteran. There is a landing zone outside of The Judge, and after 20 turns, 3 reinforcements, 2 Alpha Squads, a Heavy Section, and a B.A.U. will land there, so it is imperative to safeguard the landing zone from the alien forces.
The X-COM run under a fundamentalism, with initially 60% towards luxuries and 40% towards taxes. Research is not a factor in this scenario, as you are researching a dead-end advance that does not give you any advantage of any kind.
The aliens also run under a fundamentalist government, and start with eight cities. Unlike the X-COM, the aliens have very good shield production capacity, and thus can create new units to reinforce their numbers advantage. Alien units are able to trade unit-for-unit against the X-COM, with many forces ready to attack. Each alien city start off with Bunkers (City Walls), Training Centers (Barracks), and Food Storages (Granary).
All X-COM units treat squares as road. With the exception of the B.A.U., all units are supported for free under fundamentalism, and can attack air units.
|Alpha Squad||6.6.3||4.2||S.A.B.O.T. Ammo||Elerium Extract||80||Defense doubled against air units. Can make paradrops.|
|Heavy Section||10.5.3||4.4||S.A.B.O.T. Ammo||Elerium Extract||100|
|M.O.U.T. Team||5.7.3||4.3||S.A.B.O.T. Ammo||Elerium Extract||60|
|Reinforcement||10.5.3||3.4||Elerium Extract||Elerium Extract||160|
|Scout Platoon||4.5.7||3.1||S.A.B.O.T. Ammo||Elerium Extract||40||Ignores zones of control.|
All Alien ground units (except the Base Defense, which is immobile) treat squares as road. All ground units except the Angry Sectoids, Base Defense, and the Sectoids are supported for free under fundamentalism, and can attack air units. All units except the Base Defense also ignore zones of control. All units except the Angry Sectoids and the Base Defense have a two-space sight range.
|Angry Sectoids||5.3.1||4.1||Guerrilla Warfare||S.A.B.O.T. Ammo||50|
|Base Defense||6.8.0||5.3||Elerium Extract||S.A.B.O.T. Ammo||70||Immobile.|
|Ethereals||5.8.5||4.2||Elerium Extract||S.A.B.O.T. Ammo||60|
|King Ethereal||14.6.16||3.3||Stealth||S.A.B.O.T. Ammo||70||Air unit.|
|Mutons||8.6.5||4.3||Elerium Extract||S.A.B.O.T. Ammo||90|
|Sectoids||8.5.1||1.3||Guerrilla Warfare||S.A.B.O.T. Ammo||50|
|Snakemen||6.6.5||4.2||Elerium Extract||S.A.B.O.T. Ammo||50|