Adventure Quest Worlds is a free mmo based on 3 other games from Artix Entertainment which is Adventure Quest (
AdventureQuest) Dragon Fable (
DragonFable - Free Web RPG) and Mech Quest (mechquest.com) all these games you can play for free but the three games i have mentioned is singel player games.
But whit AQ Worlds it's a regular MMO it's free to play no downloading needed and loads of quests and friends to get.
To be Honest The wonderful world of Lore has thaught me a lot of things