World of Greyhawk (Advanced Dungeons & Dragons Boxed Set) - Gary Gygax This is, of course, the granddaddy of all preconceived RPG worlds. Again it gets 3 stars because I love reading the back story and poring over the maps.

Unfortunately, Gygax had a dreadful ear for names: Verbobonc, Grazz't, Hepmonaland.

I do remember that my friends and I invented a miniatures game based on Greyhawk.