Knowing every World of Warcraft expansion in order is no mean feat, especially with the 10th—yes, that's the 10th—set to release this year with The War Within. That adds up to a lot of hours that players have spent in Azeroth—or a lot of boars dispatched. Whichever way you want to measure it, that amount of game can feel overwhelming to new players.
If you've been playing Blizzard's MMO from the start, you likely won't have trouble listing the expansions. If you're new to the game, however...