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Mod or modification is a term generally applied to personal computer games (PC games), especially first-person shooters, role-playing games and real-time strategy games. Mods are made by the general public or a developer, and can be entirely new games in themselves, but mods are not standalone software and require the user to have the original release in order to run. They can include new items, weapons, characters, enemies, models, textures, levels, story lines, music, and game modes. They also usually take place in unique locations. They can be single-player or multiplayer. Mods that add new content to the underlying game are often called partial conversions, while mods that create an entirely new game are called total conversions and mods that fix bugs are called unofficial patches.
Games running on a PC are often designed with change in mind, consequently allowing modern computer games to be modified by gamers without much difficulty. These mods can add extra replay value and interest. The Internet provides an inexpensive medium to promote and distribute mods, and they have become an increasingly important factor in the commercial success of some games. Developers such as id Software, Valve Software, Bethesda Softworks, Firaxis, Crytek, The Creative Assembly and Epic Games provide extensive tools and documentation to assist mod makers, leveraging the potential success brought in by a popular mod like Counter-Strike.
Mods can significantly outshine and/or continue the success of the original game, even when it is becoming dated. In those cases, players might have to clarify that they are referring to the unmodified game when talking about playing a game. In some cases the term vanilla is used make this distinction, "vanilla Battlefield 1942", for example, refers to the original, unmodified game. For vanilla games, prefix "v" or "V" is commonly used together with the game title acronym, e.g., VQ3 stands for "vanilla Quake 3".
As early as the 1980s, computer game mods have been used for the sole purpose of creating art, as opposed to an actual game. This can include recording in-game action as a movie, as well as attempting to reproduce real-life areas inside a game with no regard for game play value. See artistic computer game modification, machinima and demoscene.
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A total conversion is a mod of an existing game that (usually) replaces almost all of the artistic assets in the original game, and sometimes core aspects of gameplay, in some cases creating a game in a completely different genre from the original.
In some cases, the goal of a group that sets out to create a total conversion is to sell their end product, which necessitates the need to replace the original content to avoid copyright infringement.
Since most total conversions only share the engine in common with the original game, if the engine becomes Free Software, the total conversion can be playable without having to own the original game. Counter-Strike, one of the most popular online games ever, was originally a Half-Life total conversion. It was so popular that numerous official and unofficial re-releases have been developed.
An add-on or addon is a (usually small) mod which adds to the original game's content. In most cases, an addon will add one particular element to a game, such as a new weapon in a shooting game or a new vehicle or track in a racing game, without changing any existing content. Many games are flexible and allow this, however that is not always the case. Some addons may have to replace in game content, due to the nature of the game engine, though this is not common. It may be the case, for example, that in a game which does not give a player the option to choose their character, modders wishing to add another player model will simply have to overwrite the old one.
A total overhaul mod changes or redefines the gameplay style of the original game, while keeping it in the original game's universe or plot. This may include upgrading the graphics, adding new models to replace the original ones that are in line with the original game's plot, or changing the pace of how the game is played. Total overhauls are usually combined with significant add-on material as well.
An unofficial patch can be a mod of an existing game that fixes bugs not fixed by an official patch or that unlocks content present in the released game's files but is inaccessible in official gameplay. Such patches are usually created by members of the game's fan base when the original developer is unwilling or unable to officially supply this functionality.
Due to the increasing popularity and quality of modding, some developers, notably Firaxis, have included fan-made mods in official releases of expansion packs.
For example, in the Civilization IV expansion Beyond the Sword: two existing mods, Rhye's and Fall of Civilization[1] and Fall from Heaven made their way into the expansion (the latter through a spin-off called Age of Ice[2]).
A number of fan-made maps, scenarios and mods, such as "Double Your Pleasure", were also included in the Civilization III expansion Play the World.[3]
A great many mods do not progress very far and are abandoned without ever having a public release. Some are very limited and just include some gameplay changes or even a different loading screen, while others are total conversions and can modify content and gameplay extensively. A few mods become very popular and convert themselves into distinct games, with the rights getting bought and turning into an official modification.
A group of mod developers may join together to form a mod team. An example is Team Reaction, one of the most prolific mod teams to date, most notably known for QPong and Jailbreak.
Mods are made for many first person shooters and Real-Time-Strategies, most notably the series based on Quake, Doom, Chaos, Total Annihilation, Rise of Nations and the Command & Conquer series also have many mods.
Among popular mods, none is more well known than the Half-Life multiplayer mod Counter-Strike, which was released shortly after the original game, and upwards of 1 million games per day are hosted on dedicated servers. Counter-Strike is probably the best example of a modification that turns into a retail game. Another signature mod is Team Fortress, which was based on the Quake engine and became a whole series of games, such as Team Fortress Classic, Team Fortress 2, and an unofficial mod made originally as a fan made sequel to TFC, Fortress Forever.
Mods in general are required to be non-commercial (free) when they include any parts from another mod, or the main game, which by their nature they always do. Some mods become open source as well.
Mod making tools are a variety of construction sets for creating mods for a game. Early commercial mod-making tools were the Boulder Dash Construction Kit (1986) and the Bard's Tale Construction Set (1991), which allowed users to create game designs in those series. Much more successful among early mod making tools was the 1992 Forgotten Realms Unlimited Adventures from Strategic Simulations, Inc., which allowed users to construct games based on the game world that was launched with the Pool of Radiance game.
Later mod making tools include The Elder Scrolls Construction Set which shipped with Morrowind, the Aurora toolset which was included with Neverwinter Nights, FRED and FRED2, the mission editors for Freespace and Freespace 2 respectively, the Obsidian tool set for Neverwinter Nights 2, the Garden of Eden Creation Kit SDK for Fallout 3 and the Valve Hammer Editor which is used to create maps for Half-Life, Half-Life 2 and various other games based on the Source engine (older versions also supported the Quake engine).
There are also free content delivery tools available that make playing mods easier. They help manage downloads, updates and setting up the mods so that non-technical people can play. Steam for Half life 2 mods is an example.
The potential for end-user change in game varies greatly, though it can have little correlation on the number and quality of mods made for a game.
In general the most modification-friendly games will define gameplay variables in text or other non proprietary format files (for instance in the Civilization series one could alter the movement rate along roads and many other factors), and have graphics of a standard format such as bitmaps. Publishers can also determine mod-friendliness in the way important source files are available (some programs collect their source material into large proprietary archives, while others make the files available in folders).
Games have varying support from their publishers for modifications, but often require expensive professional software to make. One such example is Homeworld 2, which requires the industrial-strength program Maya to build new in-game objects. However, there is a free version available of Maya and other advanced modeling software. There are also free and even open source modeling programs that can be used as well.
For advanced mods such as Desert Combat, that are total conversions, complicated modeling and texturing software is required to make original content. Advanced mods can rival the complexity and work of making the original game content (short of the engine itself), rendering the differences in ease of modding small in comparison to the total amount of work required. Having an engine that is for example easy to import models to, is of little help when doing research, modeling, and making a photo-realistic texture for a game item. As a result, other game characteristics such as its popularity and capabilities have a dominating effect on the number of mods created for the game by users.
A game that allows 'modding' can also be called 'moddable'. The Elder Scrolls IV: Oblivion as well as its predecessor The Elder Scrolls III: Morrowind are highly moddable, because the editor is available to download off the internet. Daggerfall was much less moddable, but some people released their own modifications nevertheless.
Supreme Commander set out to be the 'most customisable game ever' and as such included a mod manager which allowed for 'modular modding' - having several mods on at once.
The games industry is currently facing the question of how much it should embrace the players' contribution in creating new material for the game or mod-communities as part of their structure within the game. Some have openly accepted and even encourages of such communities. Others though have chosen to enclose their games in heavily policed copyright or Intellectual Property regimes(IPR) and close down sites that they see as infringing their ownership of a game.[4]
For cross-platform games, mods written for the Windows version have not always been compatible with the Mac OS X and/or Linux ports of the game. In large part, this is due to the publisher's concern with prioritizing the porting of the primary game itself, when allocating resources for fixing the porting of mod-specific functions may not be cost-effective for the smaller market share of alternate platforms. For example Battlefield 1942, ported by Aspyr for Mac OS X had file access issues specific to mods until the 1.61D patch. Unreal Tournament 2004 does not have a working community mods menu for the Mac OS X version, and until the 3369 patch had graphics incompatibilities with several mods such as Red Orchestra and Metaball. In addition, mods which are compiled into platform-specific libraries, such as those of Doom 3, are often only built for the Windows platform, leading to a lack of cross-platform compatibility even when the underlying game is highly portable. In the same line of reasoning, mod development tools are often available only on the Windows platform - id Software's Doom 3 Radiant tool and Epic Games' UnrealEd being the most notable examples.
Mod teams which lack either the resources or know-how to develop their mods for alternate platforms sometimes outsource their code and art assets to individuals or groups who are able to port the mod.
The mod specialist site for Macs, Macologist, has created GUI launchers and installers for many UT2004 mods, as well as solving cross-platform conversion issues for mods for other games.
In January 2005, it was reported that in The Sims 2 modifications that changed item and game behavior were unexpectedly being transferred to other players through the official website's exchange feature, leading to changed game behavior without advance warning.[5]
In July 2007 CNET News reported that a Grand Theft Auto Mod video uploaded to YouTube contained a link to a malware website. When a viewer clicked on the link and downloaded the mod it infected their computer.[6]