An updated version of D&D was released as Advanced Dungeons & Dragons (often abbreviated to AD&D). This was published as a set of three rulebooks, compiled by Gary Gygax, between 1977 and 1979, with additional supplemental volumes coming out over the next ten years. The AD&D rules were much better organized than the original D&D, and also incorporated so many extensions, additions, and revisions of the original rules as to make a new game. The term "Advanced" does not imply a higher level of skill required to play, nor exactly a higher level of or better gameplay; only the rules themselves are a new and advanced game. In a sense this version name split off to be viewed separately from the basic version below. The three core rulebooks were the Monster Manual (1977), the Players Handbook (1978), and the Dungeon Master's Guide (1979); later supplements included Deities and Demigods, Fiend Folio (another book of monsters produced semi-autonomously in England), Monster Manual II, and Unearthed Arcana (which took most of its additional playing information from The Dragon magazine). This was followed by a fairly constant addition of more specific setting works and optional rule supplements.