The Player's Handbook (spelled Players Handbook in first edition Advanced Dungeons & Dragons (AD&D)) is a book of rules for the fantasy role-playing game Dungeons & Dragons (D&D). It does not contain the complete set of rules for the game, and only includes rules for use by players of the game. Additional rules, for use by Dungeon Masters (DMs), who referee the game, can be found in the Dungeon Master's Guide. Many optional rules, such as those governing extremely high-level players, and some of the more obscure spells, are found in other sources.