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Welcome to,
Your X-COM Wiki featuring 2,390 articles and 4,042 users.
In other languages: Español, Pусский, Français, 한국어.

This site is dedicated to X-COM, a computer strategy game series introduced in 1994 by MicroProse.

This wiki contains a wealth of information including strategy, tactical tips, plus an in-depth look at how the game functions. If you love X-COM and want to contribute, please see the Community Portal. All rookies welcome!

Disclaimer: To be absolutely clear, this site is dedicated to a series of computer games and not to general conspiracy theories regarding UFOs and aliens.

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X-COM News

XCOM: Chimera Squad announced!

April 14th, 2020

  • Firaxis has announced an upcoming spinoff to the XCOM franchise, "Chimera Squad", to be released in April 24th. The events of the game take place 5 years after XCOM 2 and are centered upon the titular multi-species law enforcement unit keeping the peace among the humans and aliens living together in the metropolis known as City 31, as a seeming spiritual successor to X-COM: Apocalypse. The released gameplay trailer reveals that in addition to playable alien squad members, consisting of the Sectoid Verge, the Viper Torque and the Muton Axiom, the game also introduces a Breaching mechanic for setting up an opening surprise attack at the beginning of combat, a Timeline system where the combatants on both sides individually take turns after each other in a fixed, faction-alternating order rather than the entire team acting as once like in previous games, as well as disposable androids to take the place of injured agents on the team roster.

XCOM 2: War Of The Chosen DLC announced!

Reaper Resistance faction

June 12th, 2017

  • Firaxis has announced "War Of the Chosen" the next XCOM 2 DLC to be released in August 29th. The DLC will introduce several new enemies, including the Chosen, an elite alien team consisting of the Assassin, the Hunter and the Warlock tasked with recapturing the XCOM commander, along with ADVENT's new Purifier and Priest units. As for XCOM, there will be 3 new classes, Reaper, Skirmisher and Templar representing Resistance factions that you'll need to recruit to your cause. And finally, the Lost will be introduced, which consist of mutated humans who dwell in the ruins of Earth's cities that were destroyed in the initial invasion.

XCOM 2: The Real War Begins teaser

June 11th, 2017

  • XCOM's Twitter account has just posted a poster teaser for XCOM 2: The Real War Begins, the expected expansion to Firaxis' latest release in the XCOM series. Details of the new expansion will be revealed next Monday, June 12th at the E3 convention.

January 20th, 2017

  • Pavonis Interactive, formerly Long War Studios, has released a new version of its famous Long War mod for XCOM 2. Long War 2 adds several new classes, equipment, research, aliens, missions and more, while increasing the duration of the game. Long War 2 can be downloaded through the Steam Workshop page.

November 11th, 2016

June 11th, 2016

  • Steam have a one third off weekend special on XCOM 2 this weekend.

XCOM 2 Arrives

February 4th, 2016

  • It is now possible to start the preload of XCOM 2 through Steam (~24.6 Gb download). Firaxis has already announced the release schedule for the different regions and has made available the ingame characters of the Development team for use in XCOM 2's Character Pool. Several reviews have been already released on the major gaming sites - some spoilers might be included on those, read at your own risk. Good luck commanders.

XCOM 2 - Join Us Or Become Them

December 12th, 2015

  • The Official XCOM 2 "Retaliation" trailer has been released. You can check the video here and for more ingame action, you can check Beaglerush's XCOM 2 gameplay videos: War Hand, Blacksite and Legendary War Hand. XCOM 2 will be released on February 5th, 2016.
Soldier Customization

September 10th, 2015

  • XCOM2 has been made available for pre-order on Steam in addition to XCOM: Enemy Unknown being free to play for all users until 10am PT on Sunday, September 13 with a 75% discount for anyone who purchases the game during the same period. This discount also applies to all downloadable content. Like the Elite Soldier Pack that came with pre-orders of Enemy Unknown, XCOM2 pre-orders come with the Resistance Warrior Pack which has more soldier customization options.[1]

August 7th, 2015

  • Firaxis has released new footage of the upcoming XCOM2 game, with a focus on the Avenger, the mobile base used by XCOM to fight the ADVENT forces. Highlights include a tour through the base facilities and XCOM's Chief Engineer and Scientist, as well as a display of the soldier customization and the strategic layer.

OpenTFTD Beta Released


August 4th, 2015

  • The developers of OpenXcom have released the first Nightly (a.k.a. beta version) of OpenTFTD, an open source reimplementation of XCOM: Terror From The Deep. OpenTFTD comes included with the engine of regular OpenXcom and requires a copy of the original TFTD game to play.

XCOM 2 Gameplay Video Released

June 16th, 2015

  • Firaxis has released the first video of XCOM 2 gameplay during the E3 2015 conference. The footage features a tactical mission where XCOM troops have to blow up an Advent target and it shows several enemies, including the Advent units of Soldier, Captain, Turret and MEC, as well as the Viper and the evolved Muton Berserker. The video also shows the new concealment/ambush mechanic, as well as a Gremlin hacking a turret and the Skyranger retrieval. It is also possible to see Officer Bradford ordering XCOM troops into action and a glimpse of the world under the alien occupation.

XCOM2 confirmed!

June 1st, 2015

  • 2K and Firaxis have confirmed today on the XCOM official website [[2]] the upcoming sequel to XCOM: Enemy Unknown. XCOM2 takes place 20 years after the events of the remake, where the aliens have taken over Earth and the remains of XCOM are waging a guerrilla war against the extraterrestrials. The game will feature new soldier classes, the return of the Snakemen along with other new aliens, procedure generated (random) maps, and will be exclusive to the PC with specific features for mod development. More features will be revealed soon on IGN [3].

May 29th, 2015

  • Two clues at the Advent website have a series of letters that when combined produce "VIGILO CONFIDO", or the motto of Enemy Unknown 2012. It seems that a new XCOM game is under development and more details should be announced later.

May 27th, 2015

  • 2K has released yesterday a link to a site that presents an alternate reality company called Advent Administration. Its contents have triggered speculation on the 2K official forums and Xcom subreddit that it is related to a new upcoming XCOM announcement. The site contains a rotating globe, pictures depicting a XCOM: Apocalypse style city, one of which seems to contain artwork already present on XCOM: Enemy Unknown, and a downloadable .pdf file uses a font called 'XCOM-Regular'. The site also appears to be under some sort of hacking by an unknown party, with its contents being replaced by phrases such as 'we are still watching'. While all of this is merely circumstantial evidence, 2K is expected to announce a major title on the next E3 Conference in 3 weeks so keep tuned for further details.

January 1st, 2018
Maintenance In Progress. In order to improve the wiki's usage, UFOPaedia has been moved to a new server, together with an an upgrade to its MediaWiki software, all thanks to NineX, who has offered to host the wiki. Please reports any bugs you might find in the Talk: Main Page.
August 10th, 2016
Site move to the new server complete. was successfully moved to the new server, which should solve the past month issues with accessing the wiki. Anti-spam measures are also going to be installed, which should allow later for new site sign-ups. Big thank you to Jo5hua for the new hosting and all the work updating the site.
June 9th, 2015
XCOM 2 on UFOPaedia. An XCOM2 page has been created to collect all the information released so far about the upcoming sequel to Enemy Unknown. Later a section for the new game will be added.
June 3rd, 2014
Long War on UFOPaedia. The much acclaimed Long War mod for XCOM: Enemy Unknown/Enemy Within now has its own subwiki at the UFOPaedia. Long War features over 700 changes to EU/EW and has been described by Jake Solomon (EU's lead designer) as: "If you liked XCOM, give The Long War mod a shot. Takes XCOM to a new level."
March 17th, 2014
UFOPaedia on Twitter. The UFOpaedia now has its own Twitter account ( Please use the hashtag #ufopaedia on your posts.
December 29th, 2013
Software Upgrade. UFOpaedia has now been upgraded from version 1.16 to version 1.22. Whilst functionality has been checked and should work as normal, if you encounter anything odd then please let Pete know under the Wiki Software Upgrade section here.
December 27th, 2013
Server Transfer. At 10am GMT on the 27th December the UFOpaedia will be transferred to a new server on strategycore. Posting will be disabled for a short period whilst the transfer takes place.
December 20th, 2013
Enemy Within mapped out. The Maps section of XCOM: Enemy Unknown now contains overhead images of all the EW DLC's new maps on the individual map pages.
November 22nd, 2013
Site Maintenance Continues. The good news is that it is possible now to register new users. The bad news is that the spammer problems aren't solved yet, so when registering please don't choose a suspicious username or you might find yourself blocked. Hang in there, Commander.
November 2nd, 2013
Site Maintenance. We're currently performing some site upgrades in order to solve the spammer problem and other issues. While the maintenance is underway it won't be possible to register new users but already existing users can continue working. Thank you.


September 23rd, 2013
Spam attacks. We've been having a lot of spammers recently so we're taking the policy of preemptive blocking of users with suspicious usernames. To prevent this happening to you either choose a username XCOM related or page edit right after you register. Thanks.
August 20th, 2013
The Bureau: XCOM Declassified section open. The UFOPaedia's section of the new XCOM game is now open. Feel free to start contributing.
February 7th, 2013
XCOM: Enemy Unknown maps revealed: The Maps section of the re-imagined game's now contains overhead images of all maps on their individual pages.
December 28th, 2012
Enemy Unknown section growing: The EU2012 section now has over 200 pages. Thanks to everyone who has contributed so far and keep enjoying the game in 2013. :)
October 4th, 2012
New Main Page: features a new Main Page, this to better structure the information and news. Each section draws information from two different pages XCOM_News for general news about the games and UFOpaedia News for news on the wiki site.

Enemy Unknown (1994)

UFO Badge UFO: Enemy Unknown (aka X-COM: UFO Defense)
General Information
The Geoscape


UFO Detection
UFO Interception
X-COM Bases
Base Facilities
Country Funding
X-COM Craft
Craft Armaments


Heavy Weapons Platforms
Miscellaneous Equipment
Alien Life Forms
Overview of Aliens
Alien Missions
Alien Ranks
UFO Components
Alien Artefacts
The Battlescape (Tactical Combat)

Mission Types

UFO Crash Recovery
UFO Ground Assault
Alien Base Assault
Terror Missions
Base Defence


Field Manual
Night Missions
Squad Composition
Rear Commanders
Initial Deployment
Sweeping the Battlescape
Time Management
Reaction Training
Reaction Fire Triggers
Alien Movement Patterns
Proximity Grenade
Smoke Grenade
Grenade Relay
Stun Rod
Game Strategies
A Beginner's Guide
Base Management
Base Layout Strategy
Experience Training
UFO Recovery Values
Manufacturing Profitability
Tricks, Tips and Hints
Common Mistakes
Managing the Item Limit
Making the Game Harder
Murphy's Laws of X-COM
Miscellaneous Information
X-COM Timeline
Weapon Analysis
Sightings in other fandoms
Glossary of Terms
Data Canisters
Realistic Equivalents
Cultural Influences on X-COM
Game Editors & Mods
Council of Funding Nations
The Mysteries of X-COM
GUS Music in Dosbox
Ideal DOSBox Settings (UFO/TFTD)
Technical Information
Game Mechanics
Destroying Terrain
Damage Modifiers
Fatal Wounds
Accuracy Formula
Reaction Fire
Recovery Time
Equipment Recovery
Line of Sight
Difficulty Levels
Research Technical Details
Data Tables
Alien Appearance Ratios
Inventory TU Table
Movement TU Tables
Item Weight
Unit Height
Kill Modelling
Starting Stats
Alien Stats
Research Times
Game Files
Known Bugs
Game Versions
Open Questions

Terror From the Deep (1995)

TFTD Badge X-COM: Terror From the Deep
General Information
The Geoscape
X-COM Subs
Sub Armaments
Submersible Weapons Systems
Base Facilities
Alien Research
Alien Artefacts
Alien Life Forms
Overviews of Aliens
Alien Missions
Alien Ranks
Terror Units
Alien Subs
Alien Sub Components
The Battlescape (Tactical Combat)
Battlescape Overview
Mission Types
Alien Sub Crash Recovery
Alien Submarine Assault
Terror Mission
Port Attack
Island Attack
Shipping Lane Mission
Artefact Site
Colony Assault
Base Defense
Game Strategies
TFTD Strategy Guide
Weapon Effectiveness tables
Weapon Analysis
Realistic Equivalents
Sightings in other fandoms
Enabling the cinematic intro/outro
Wish List
GUS Music in Dosbox
Ideal DOSBox Settings (UFO/TFTD)
Technical Information
Data Tables
Alien Appearance Ratios
Game Files
Known Bugs
Research Tree Bug Avoidance Guide

Apocalypse (1997)

Apocalypse Insignia X-COM: Apocalypse
General Information
Known Bugs
City Maps
Buildings and Areas
Cityscape Fighting
UFO Incursions
Alien Ship Combat
Alien Infiltration
Mission Types
Real-Time Combat
Turn-Based Combat
Real-Time vs Turn-Based Analysis
Starting a Mission
Agent Automatic Reaction Controls
Engaging the Enemy
Strategies for Troops
Base Defense
Capturing Live Aliens
Take Cover!
Quantum Physics
Agents Stats
Agents Medals
Agents Equipment
Agents Armor
Suggestions for Equipping Troops
Vehicle Weapons
Vehicle Engines
Vehicle Equipment
Alien Life Forms
Alien Overview
Alien Artifacts
Alien Tech Levels
Alien Ships
Alien Dimension
UFO Combat
Miscellaneous Information
X-COM Timeline
Weapon/Equipment Analysis
Making the Game Harder
Sightings in other fandoms
Unused Game Features
Concept Information
Game versions and builds
Cut items and features
Cut mechanics and behavior
What it should be. Design doc OpenApoc
Technical Information
Difficulty Levels
Data Tables
Unit Stats
Damage Modifiers
Game Files
Audio File Formats
Music player
Image File Formats
Cityscape Files
Learning AI
Input Device Reference
Mods, Utilities, Compilations
User Guides
NKF's Starter Guide
AllOutWar's Guide
Captain Foo's Beginner Guide

Enemy Unknown (2012)

XCOM: Enemy Unknown (2012) / Enemy Within DLC Meld Insignia (EU2012).png
Vigilo Confido shield.png Overview
Game Information
Commander's Briefing
Base Location
The Council
Difficulty Levels
Second Wave
Vigilo Confido black.png Headquarters
Mission Control


Alien Containment
Genetics Lab EW DLC
Psionic Labs


Cybernetics Lab EW DLC


Officer Training School


Situation Room

Gray Market
Covert Operations EW DLC
Lone Wolf (EU2012).jpg Soldier
MEC Trooper EW DLC
Covert Operative EW DLC


Gene Mods EW DLC
Medals EW DLC
Head red 2.png Aliens
Alien Life Forms
Overview of Aliens
Alien Stats
Alien Deployment
Alien Artifacts
EXALT Insignia (EU2012).png EXALT EW DLC


Skyranger Pilot (EU2012).png Missions
Mission Types



Gameplay Mechanics

Chance to Hit
Critical Wounds
Bradford Small (EU2012).png Guides & Tips

Strategy Guide

Building Optimization
Air Combat
Story Walkthrough

Combat Tactics

Class Builds
List of all Abilities

Survival Guide

Shen Small (EU2012).png General DLC

General Information

Elite Soldier Pack
Enemy Within EW DLC
New Friend (EU2012).jpg Slingshot DLC

Operation Slingshot

Friends in Low Places
Confounding Light
Shaojie Zhang
Saved to Savior (EU2012).jpg Progeny EW DLC

Operation Progeny

Annette Durand
Meet New People Then Kill Them (EU2012).jpg Multiplayer


Multiplayer Tactics
Squad Builds
Happy to Oblige (EU2012).jpg Miscellaneous

Game Credits


News Ticker

Game Universe/Artwork

XCOM Heroes

Making The Game Harder

Glossary of Terms

Murphy's Laws (XCOM)

Combat Ready (EU2012).jpg Technical Information



Mods & Suggestions

Game Editors

Game Files

Unused Features

Wiki Tips

The Bureau: XCOM Declassified (2013)

The Bureau: XCOM Declassified
Bureau Logo.JPG XCOM
Game Information
From the desk of Myron Faulke
Difficulty Levels

The Bureau

The Base


Agent William Carter
Director Myron Faulke
Agent Angela Weaver
Lieutenant Leon Barnes
Doctor Alan Weir
Agent Nico DaSilva
Supporting Staff
Head red.png Aliens
Alien Life Forms
Bureau.png Missions
Gameplay Mechanics

Combat Tactics

Battle Focus

Mission Types

Major Operations (Spoliers)
Base Investigations
Minor Operations
Dispatch Missions
Game Strategies
Guides & Tips

Story Walkthrough

Class Builds


News From the Front

In-Game Notes

In-Game Photos

Glossary of Terms



Mods & Suggestions



Hangar 6: R&D

Agent Donovan

Light Plasma Pistol


Interceptor Badge X-COM: Interceptor
General Information
The Frontier
Hypernews Network
E-Mail X-Com E-Mail X-Com
General Information
X-COM: Enforcer
General Information
The Enforcer, Dr. Standard and the Enemy
Weapons and Power Ups
The Missions
Tips and Tricks

Featured Projects is also home to several open source X-Com based projects.

UFO2000 wiki
OpenXcom wiki
UFO:AI wiki

Discontinued Titles

X-COM: Genesis
X-COM: Alliance
General Information
General Information

Site Information
Community Portal
How to Edit This Site
Guidelines to Writing Articles
Where to Get the Games