http://deathball.net/notpron/notpron.htm
it's a good time spender, a very adictive. Basically you have several levels, shown as a web page, and you need to follow the clues in order to get the username and password for the next level, or the link to it. It's really hard in some parts, and you may get stuck at some parts. I'm already at level 35, and a bit stuck so if you need any help with the later levels you can ask me
here's the direct link to the first level:
http://www.deathball.net/notpron/levelone.htm
here are some hints for the first levels:
http://deathball.net/notpron/hints.htm
and the forum:
http://forums.gameservers.net/forumdisp ... rrerid=752
in some of the levels, you need to check the source code, or search google. Also some answers are encripted, or spelled backwards, and others hiden in the image of the level. have fun