Endless Paradigm

Warning: may rack up a lot of history entries
http://probablyinteractive.com/url-hunter


Or if that's too boring, try defender in the favicon (aka the shortcut icon)
http://www.p01.org/releases/DEFENDER_of_the_favicon/

The first one seems interesting. worth a try when bored.

Interesting but not that fun.

that second one is sweet. Game in a favicon. :O

oh mai @.@

Cool!

lol cool
interesting idea. I think the best thing possible with this is to put it in the url of a site that takes a long time to load so you could play it and you don't get bored till the site loads up.

^ Doesn't really work because of the fact that the page needs to be loaded for this concept to work.
A browser extension makes a lot more sense for something like that.