Kingdom of Loathing is a multiplayer role-playing game, which uses hand-drawn stick figures and rather surreal reality to draw you into the world of parody of the world of the adventure. Well, something like that.
The basics are similar to the normal adventure games, but from the first look you can tell that it is not a usual adventure game - you fight monsters for experience and acquire meat, which is the currency in this world. Players may also interact with each other through player versus player competition, participate in the in-game economy by trading goods and services, organize their characters into clans, work together to complete clan dungeons, and speak to each other in many different chat channels.
I recently read an article pointing out how Google and Facebook killed browser games, but while author made some valid points, he missed on few key elements.