Over the years, there have been a number of different versions of the Dungeons & Dragons fantasy role-playing game (D&D). The current publisher of D&D, Wizards of the Coast, produces new materials only for the most current edition of the game. Some D&D fans, however, continue to play older versions of the game and some third-party companies continue to publish materials compatible with these older editions. Parallel versions of D&D throughout its history and inconsistent product naming practices by D&D's original publisher TSR, Inc. can make it difficult to distinguish between the various editions of the game.