What are some fun online games that don't invole downloading toolbars and crap like that?

I'm extremely bored and cant find any games online that look like fun. I want good ones but without having to buy or download anything.

P.S. I'm 13

Kids beat the crap out of each other! (5/30/09-87)

Does Twitter work in LA? I think so...Follow me? www.twitter.com WOOT!!! we made it to LA finally!!! Sorry it took so long to get up but we have been SOOO slammed all day!