An expansion pack, expansion set, supplement, or simply expansion is an addition to an existing role-playing game, tabletop game or video game.
 These add-ons usually add new game areas, weapons, objects, characters and/or an extended storyline to an already released game.
 While board game expansions are typically designed by the original creator, video game developers sometimes contract out development of the expansion pack to a third-party company, (see "" for "Diablo"), it may choose to develop the expansion itself or it may do both (Ensemble Studios developed the real-time strategy game Age of Empires III and the first expansion called itself, but contracted Big Huge Games for the second expansion pack, the Asian Dynasties).
 Board games and tabletop RPGs may have been marketing expansions since the 1970s, and video games have been releasing expansion packs since the 1980s, early examples being the "Dragon Slayer" games "" and "Sorcerian".
Jagged Alliance 2 is a tactical role-playing game for PC, released in 1999 for Windows, and later ported to Linux by Tribsoft.
 It is the third game in the "Jagged Alliance" series, and was followed by the expansion "Unfinished Business" in 2000.
 Two commercial releases of the mod "Wildfire" (2004) are also available as expansion packs.
 "Jagged Alliance 2" and the "Unfinished Business" expansion were combined in the "Jagged Alliance 2 Gold Pack", released on August 6, 2002.
Keith Baker (born July 7, 1969) is a game designer and fantasy novel author.
The Sims is a 2000 strategic life-simulation video game developed by Maxis and published by Electronic Arts.
 It is a simulation of the daily activities of one or more virtual people ("Sims") in a suburban household near a fictional city.
 The game's development was led by game designer Will Wright who is also known for developing the "SimCity" series.
 "The Sims" original series had a total of seven expansion packs produced, with expansions adding new items, characters, skins, and features.
 The game has had several subsequent sequels; "The Sims 2", "The Sims 3" and "The Sims 4".
Race 07 is a racing simulator computer game from SimBin Studios (later Sector3 Studios).
 The game is the sequel to the 2006 title "Race – The Official WTCC Game".
 Like the original "Race", the title is officially licensed by the World Touring Car Championship (WTCC).
 It has since spawned nine expansion packs: "GTR Evolution", "STCC – The Game", "Race On", "Formula Raceroom" (which was provided free of charge), "STCC – The Game 2", "GT Power", "WTCC 2010", "The retro expansion" and the final expansion to the series, "Race Injection" .
Rangers Strike (レンジャーズストライク , Renjāzu Sutoraiku ) is a Japanese trading card game created by Carddas initially based upon Toei's Super Sentai Series television franchise.
 It was released in 2006 in commemoration of the Super Sentai series' 30th anniversary.
 The game was expanded with several expansion packs, such as The Masked Rider Expansion (ザ・マスクドライダーEXP , Za Masukudo Raidā EXP ) collection in 2007, featuring characters from the Kamen Rider Series television franchise, and the Special Metal Edition (スペシャルメタルエディション , Supesharu Metaru Edishon ) in 2008 featuring characters from the Metal Hero Series television franchise.
 The new X Gather (クロスギャザー , Kurosu Gyazā ) expansions feature characters from the Super Sentai, Kamen Rider, and Metal Hero Series, and other TV series based on works by Shotaro Ishinomori ("Robocon", "Kikaider", "Inazuman", etc.).
Cyberlore Studios was a developer of computer games based in Northampton, Massachusetts, United States.
 The company was founded by Lester Humphreys, Ken Grey, and Herb Perez.
 Since 1992, they produced expansion packs for "MechWarrior 4", "Heroes of Might and Magic II", and "".
 They also produced "" (2004), a simulation game based on the life of Hugh Hefner and "Playboy", and a PlayStation 2 version of the classic board game "Risk".
 Their most notable game is "", whose original concept was created by Jim DuBois, who worked as a senior designer there.
Gloom is a tabletop card game created by designer Keith Baker and published by Atlas Games in 2004.
 It won the Origins Award for Best Traditional Card Game in 2005.
 Four expansion packs have been created since the release of the original game called, "Unhappy Homes", "Unwelcome Guests", "Unquiet Dead" and "Unfortunate Expeditions".
 Additionally, In August 2011, Cthulhu Gloom, which serves as either a standalone game or a fourth expansion pack, was released, and one Cthulhu expansion pack has been released, called "Unpleasant Dreams".
Ray Game Designer 2 (also known as RGD2) is a freeware application designed for developing simple 3D computer games such as first-person shooters and third-person platformers, without learning an advanced programming language.
 It was written by Emmanuel Icart of Momor Productions with the Delphi programming language.
 Games created with Ray Game Designer 2 can be distributed freely or sold for profit, without paying any royalties to Momor Productions.
 RGD2 can use either OpenGL, Direct3D, or its own software engine for rendering 2D and 3D graphics.
 Ray Game Designer 2 uses an extremely simple syntax for creating "behaviours", code used to create simple artificial intelligence in its games.
 RGD2 comes in the French and English languages, but can be translated into virtually any language by editing a few text files.
 Ray Game Designer 2 is also the successor of Ray Game Designer.
 The software remains unfinished and hasn't been updated since early 2002.
Disciples II: Dark Prophecy is a Microsoft Windows game by Strategy First that was released in 2002.
 The game is the sequel to the 1999 game "", and has become significantly more successful in terms of both sales and popularity than its predecessor.
 A limited edition version of the game was released, which included a card game based upon the story and game dynamics of the video game called "Guardians of the Light" and "Servants of the Dark".
 This game, along with the expansion packs "Rise of the Elves" and "Gallean's Return", was part of the Strategy First "Fantasy Pack", which was released with 3 other games: "", "", and "Prince of Qin".

Question: How many expansion packs have been created for a game that Keith Baker, a game designer, created?
Answer: Four