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The adventure begins with PCs falling down an earthen tunnel. It is suggested that the portal to Dungeonland be a barrel within the dungeon of Castle Greyhawk, but the Dungeon Master (DM) may work in any premise to get them to this stage. Upon landing, the PCs find themselves in a surreal, oddly-shaped hallway which contains The Pool of Tears and the entrance to a diminutive garden. Once they have explored these areas, they cross a fungi forest and arrive at The Wilds of Dungeonland, which is essentially a wooded area containing several connected clearings.
EX1: "Dungeonland" (1983), by Gary Gygax, was the first look into Castle Greyhawk, sort of. It was published in 1983. The "EX" is code for "Extension"; at one time the code "GC" was instead being considered, presumably for "Greyhawk Castle."