Devised and created by Gary Gygax and Dave Arneson in 1974, Dungeons & Dragons is a fantasy role-playing game that was originally published by TSR (Tactical Strategic Rules) and is now published by Wizards of the Coast. In Dungeons & Dragons, or D&D as it is more commonly known, players assume the roles of characters and are guided through a fantasy world by another player, known as a Dungeon Master, acting as referee. The Dungeon Master and players form a co-operative, and together they embark on adventures in which they solve mysteries, gather treasure, and fight monsters. The decisions that the players make and the battles they indulge in are governed by dice rolls which determine the players' success or failures.  Notable for using 20-sided dice and brought into mainstream consciousness by being heavily featured in the globally successful Netflix series Stranger Things, Dungeons & Dragons, is now more popular than it has ever been at any other point in its 46-year history.