UK—United Kingdom a series of mostly independent adventures developed by the TSR UK office  WG—World of Greyhawk was a series of stand-alone adventures set in Greyhawk for 1st edition except as noted. No modules were ever assigned codes WG1–WG3. WG1 was earmarked for "The Village of Hommlet" (T1), and WG2 was earmarked for "The Temple of Elemental Evil" (T1-4). WG3 was to be "Lost Caverns of Tsojcanth" (S4), a loosely tied prequel to WG4. WG7 was advertised during summer 1986 as "Shadowlords", a collaboration between Gary Gygax and Skip Williams. Gygax's lawsuit with TSR put "Shadowlords" in limbo, and it was replaced with "Castle Greyhawk". WGA—World of Greyhawk Adventure  WGM—World of Greyhawk Mission WGQ—World of Greyhawk Quest WGR—World of Greyhawk Reference is a mix of adventures and background information. WGS—World of Greyhawk Swords was originally intended as a trilogy. The planned third module became instead the Greyhawk Wars boxed wargame. X—eXpert series was for use with "Dungeons & Dragons Expert Set" except where noted and set in Mystara.