Forgotten Realms
The "Campaign Set" (often referred to as the "Grey Box") was later released in 1987 as a boxed set of two source books ("Cyclopedia of the Realms" and "DM's Sourcebook of the Realms") and four large maps, designed by Greenwood in collaboration with author Jeff Grubb. The set introduced the campaign setting and explained how to use it, and reserved space on the map for SSI's Gold Box computer role-playing games set in the Forgotten Realms.
Forgotten Realms
The original gray boxed set received a revision in 1993 to update it to the second edition "Advanced Dungeons & Dragons (AD&D)" rules system, with the release of a new "Forgotten Realms Campaign Setting" boxed set, containing three books ("A Grand Tour of the Realms", "Running the Realms", and "Shadowdale") and various "monster supplements", with a new graphic look. Additional material for the setting was released steadily throughout the 1990s. Forgotten Realms novels, such as the "Legacy of the Drow" series, the first three books of "The Elminster Series", and numerous anthologies were also released throughout the 1990s, which led to the setting being hailed as one of the most successful shared fantasy universes of the 1990s. These novels in turn sparked interest in role-playing activity by new gamers.