These worlds are for runescape players to gather together to complete quests together. Some players might want to have some company when doing quests, these worlds (although not proven :p) might increase the chances that you find someone doing the same quest as you. Sone quests in Runescape require partners to finish the quests eg. Shield of Arrav, these worlds might make it more simpler to find a partner.
shield of arrav, if you are at the part where you need to find a partner, then try to go to world 100 (quest group world) and go to ge and search for people that you can interact with. have fun =D
world of war craft adventure quest pirates on line wizard 101
adventure quest/ battle on, World of Warcraft (game, not website)
Runescape, dragon quest, ( that's all i can think of just now )
Pikkupstix the druid is in Taverly. If you look on the world map, his house is the one with the quest start and summonig store.
World of Warcraft, cabal online, knight online, adventure quest, adventure quest worlds. those are just a few I can think of right now.
Well yeh runescape i like. world of warcraft, guild wars, gates of andaron, search mmorpg.com for more.
runescape club penguin,moshi monsters,legend of edda,age of empires,world of warcraft,adventure quest,and lots more.
runescape FTW!
runescape has more total however idk if runescape has more members
5000
Look through the world selection screen, and go to a quest would at the GE or in a town somewhere - you're bound to find someone there.