Dungeon! is a adventure board game first designed by David R. Megarry, Gary Gygax, Michael Gray, Steve Winter and S. Schwab, published by TSR, Inc.[1975 ] Dungeon! simulates some aspects of the Dungeons & Dragons role-playing game which was released the year before, although Dungeon! was already in development when it was released. Updated editions in 1989 and 1992.