The original release of "Neverwinter Nights" includes the game engine, a game campaign that can be played as single player or in multiplayer mode, and on Windows releases, the Aurora toolset used for creating custom content that would run in the same engine. Three expansion packs were subsequently released for the game: ' in June 2003; ' in December 2003; and "" in November 2004. BioWare began selling premium modules through an online store in late 2004. The game's success led to a sequel, "Neverwinter Nights 2", released on October 31, 2006.