an_idol_mind said:Was the Great Wheel really an essential part of D&D? It wasn't used at all in B/X or BECMI, and didn't receive a mention in the 3.0 core books (getting added in at the Manual of the Planes, IIRC). While I know 2nd edition AD&D mentioned a number of planes, I don't think it was specifically laid out as the Great Wheel until Planescape. And I don't remember a lot of referencing to the Great Wheel in 1st edition AD&D until Manual of the Planes, although my memory could be rusty on that one.
Where exactly was the Great Wheel introduced? How often has it been included in the core books, rather than added on later?
The arrangement of inner and outer planes was introduced in the first edition PHB, I believe (it may have been in Dragon issue before that). It wasn't called the "Great Wheel" (and looked more like a box than a wheel), but it was the same planes and the same arrangement as the Great Wheel. It was not presented as "the Planes of Greyhawk" but rather as "the Planes of AD&D".
In 27 years of playing D&D, 100% of campaigns that I've played in or run have used that arrangement of planes. Though admittedly, in some games, we never reached high enough level to do any plane-hopping.