Tactical Studies Rules (TSR): The Genesis of Dungeons & Dragons and Fantasy Gaming Tactical Studies Rules, Inc. – often abbreviated TSR – stands as a pivotal figure in the history of tabletop role-playing games (TTRPGs), specifically credited with launching the phenomenon that is Dungeons & Dragons. Founded in October 1973 by Gary Gygax and Don Kaye in Geneva, Switzerland, TSR wasn’t merely a publisher; it was an incubator for innovat…