[Edit - I just got done with telling one other person to not advertise websites in posts, now I have to it again. People need to start reading the rules. - TPB]
go to www.battleon.com. here is a description for ya:
Battle On!
AdventureQuest is a free lunch break sized RPG that you can play daily using your web browser. We are adding new things every week! Join us in shaping the direction of this campy yet addictive role playing game.

it is an rpg where you fight monsters, collect weapons, shields, armour, spells and pets. you make a profile with username and password and you play to make your character level up and become the strongest. This game is completely free, and you can pay $12 (£7 in U.K) if you want to become a guardian.
A guardian gets great perks such as more weapons, more of the game, harder monsters, and much more!!
Join adventure quest today. You will soon get addicted as i have!!! the whole of the boys in my year are on this game, that shows you how addictive it is.
For more details, check out the site yourself and give it a go!!