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Expansion packs (EP) are add-ons for The Sims games. They make the original game more interesting by providing new things to the game, and are often centered around a theme. They require the original game (also known as base game or core game) to work. Sometimes, collections or compilations of the base game and one or more expansion(s) are released. The Sims 2 and The Sims 3 also offered mini-expansions called stuff packs (SP), which offered only new objects and clothes, though they sometimes included gameplay changes as well. Gamers are advised to check what an edition includes before buying it.

The Sims
In The Sims, there are 7 expansion packs. They are:
 * Livin' Large
 * House Party
 * Hot Date
 * Vacation
 * Unleashed
 * Superstar
 * Makin' Magic

The Sims 2
The producers released 8 different expansion packs for The Sims 2. They are:
 * University
 * Nightlife
 * Open for Business
 * Pets
 * Seasons
 * Bon Voyage
 * FreeTime
 * Apartment Life

Additionally, 10 different stuff packs were released. They are:


 * Holiday Party Pack
 * Family Fun Stuff
 * Glamour Life Stuff
 * Celebration Stuff
 * Happy Holiday Stuff (This was an expanded re-release of the Holiday Party Pack.)
 * H&amp;M Fashion Stuff
 * Teen Style Stuff
 * Kitchen &amp; Bath Interior Design Stuff
 * IKEA Home Stuff
 * Mansion and Garden Stuff

The Sims 3
As of March 9th, 2012, there are six expansion packs that have been released for The Sims 3. They are (in order of release):
 * The Sims 3: World Adventures
 * The Sims 3: Ambitions
 * The Sims 3: Late Night
 * The Sims 3: Generations
 * The Sims 3: Pets
 * The Sims 3: Showtime
 * The Sims 3: University

There are also five stuff packs that have been released. These stuff packs, in order of release, are:
 * High-End Loft Stuff
 * Fast Lane Stuff
 * Outdoor Living Stuff
 * Town Life Stuff
 * Master Suite Stuff

Themes
Each expansion pack for The Sims is centered around one or more themes. The most popular Expansion Pack ever released to date is The Sims 2: University, selling almost 2 million copies worldwide.