Video game modding

This article is about modifying videogames. For general modification of hardware and software, see modding.

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 stand-alone 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, 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 Blizzard Entertainment, 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 help to continue the success of the original game, even when it the original game has become 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. They 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 also artistic computer game modification, machinima, and demoscene.

Types

Add-on

An add-on or addon is a (usually small) mod which adds to the original content of a specific game. In most cases, an add-on will add one particular element to a game, such as a new weapon in a shooting game, a new vehicle or track in a racing game, or guns in a game like Minecraft, 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. Such famous examples of this type of mod is the Grand Theft Auto series wherein modders may use downloadable tools to replace content (such as models) in the game's directory. The Left 4 Dead series can also be modded with individual add-ons which are stored in a .VPK format in order that the player may choose to activate the mod or not.

Total overhaul

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. Many mods of Half-Life such as Earth's Special Forces (fighting genre) or Football Championship (sports genre) are capable of changing gameplay while utilizing a modified engine.

Unofficial patch

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 supply the functionality officially. One downside of this type of mod is that leaked content can be revealed. An example is the Hot Coffee mod for Grand Theft Auto: San Andreas, which was removed in version 1.01 because of lawsuits by parent associations. Hot Coffee was brought back to version 1.01 by a group of a modders in 2005, which found the animation files and scripts in in the first version of the game. The scripts were re-added and the animations were re-hexed so the game would not have any conflict.

Popular games with Mods

Technic Pack for minecraft

Official status of mods

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 and Fall from Heaven made their way into the expansion (the latter through a spin-off called Age of Ice).

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.

Development

Most 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, and 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 noncommercial (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.

Tools

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 nontechnical people can play. Steam for Half-Life 2 mods is an example.

Game support for modifications

File:Audi Vice City.JPG

An example of game modification in Grand Theft Auto: Vice City: a 2005 Audi A8L W12 car. Real-life makes and models are not included in the game but can be created and added by modders.

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, but 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 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 photorealistic 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 is said to be "moddable". The Elder Scrolls V: Skyrim as well as its predecessors, The Elder Scrolls III: Morrowind and The Elder Scrolls IV: Oblivion, are examples of highly moddable games, with an official editor available to download from the developer. Daggerfall was much less moddable, but some people released their own modifications nevertheless. Some modifications such as Gunslingers Academy have deliberately made the game more moddable by adding in scripting support or externalizing underlying code.

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.

Portability issues

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.

IAlso, mods 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 that lack either the resources or knowhow 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.

Unexpected consequences of modding

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.

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 the computer.

In early 2012, the DayZ modification for ARMA 2 was released and caused a massive increase in sales for the three-year-old game, putting it in the top spot for online game sales for a number of weeks and selling over 300,000 units for the game.

See also

• Adventure Construction Set, one of the earliest games for which user-created content was widely made and distributed.
• Fork (software development)
• Level editor
• Modding
• ROM hacking
• Texture artist
• Steam Workshop