The Caverns of Thracia
I loved X2, primarily because of the NPCs, but it was the first module of which I remember thinking, "Wow, this single room is 100 feet square. Damn, that's big. And WTF ... a boxing ring?!"
I agree that X2 was very D&D, but IMO it was a little too caricaturish of D&D.
I never used modules, having an active imagination, I always came up with my own adventures to run.
Storm Raven said:A 10 x 10 room is really big?
Seconds for Escape from Zanzer Tem's Dungeon and B10: Night's Dark Terror, but if I had to pick one that topped the list for me, it would absolutely have to be X3:
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(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.