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Dungeons & Dragons is a tabletop role-playing game designed by Gary Gygax and Dave Arneson that was first published by Tactical Studies Rules, Inc. in 1974. It is best played with one Dungeon Master and 3-6 players. Players create and roleplay adventurers and go on co-operative quests together. Dice rolls, typically using a D20, determine the outcome of character actions. A session of D&D is as long or as short as players want, but usually lasts around 2-8 hours.