Star Wars: The Roleplaying Game
The Star Wars Roleplaying Game is a roleplaying game set in the Star Wars universe, written by and published by West End Games between 1987 and 1999. A later but unrelated Star Wars RPG was published by Wizards of the Coast in 2000.
The game, based on WEG's earlier Ghostbusters RPG, established much of the groundwork of what later became the Star Wars Expanded Universe, and their sourcebooks are still frequently cited by Star Wars fans as reference material. Lucasfilm considered their sourcebooks so authoritative that when Timothy Zahn was hired to write what became the Thrawn trilogy, he was sent a box of West End Games Star Wars books and directed to base his novel on the background material presented within.
WEG's license to produce Star Wars material was lost after the company declared bankruptcy in 1998.