What's the best browser based game you've ever played?

I want to play games while I sit idle for 6 hours every day at the library. What is the best free game ever?

On Emuparadise.org you can play NES games for free in your window with Java.

Runescape, I'm sad to say, is actually a pretty good game.

Yeah it is

I bought a month of play time, I could only stand to play it for one month straight, though.

i would have to go with runescape, otherwise make it your goal to beat all the games on addictinggames.com

Goddamn it you guys, enough with the runescape. I'm not playing runescape again.

From now on, no repeats.

...Anyone want to start a clan on runescape?

Tofu Hunter is pretty awesome. So is Robot Unicorn Attack.

yeah, if you haven't already, defiantly check out adult swim's games.

How about something with a leveling system of some sort?

...runescape...