The vintage 1990 Advanced Dungeons & Dragons 2nd edition module titled WG7 World Greyhawk Castle Greyhawk is a sought-after collectible item for fans of the Dungeons & Dragons role-playing game. Produced by TSR in the United States, this module is part of the Greyhawk campaign setting and provides players with an adventure set in the iconic Castle Greyhawk. With an age level recommendation of 12-16 years and up, this module offers players a chance to explore and conquer the challenges within this legendary castle in the fantasy world of Greyhawk.