Can somebody help me find these puzzle websites?

A couple years ago I used to do these “puzzle websites” all the time. They aren’t fancy flash games or anything. Basically it’s a site with web pages that give you clues via an image, text, or maybe a hidden link and you have to figure out the answer. Once you think you have the answer, you usually type it at the end of the URL and it will take you to the next page, if you got it right.

Example:

http://www.jeiogfw.com/begin <~ this is the start of the game.

This page will have some clues and stuff on it. If I think the answer is “banana”, I’ll type it in like so:

http://www.jeiogfw.com/banana

And so on…

What are these games called? Where can I find them? Have you played them before? What are some good ones?