My roomate showed me a very interesting on-line game. It's like a puzzle, but more complex.
The point is to get to the next level, but finding the username and password hidden somehow on the current level page.
I've played till 3am :) and managed to get to the 14 level by now.
Let's see whether I will pass this :).
Oh, the URL of the game? Of course :) - http://deathball.net/notpron/notpron.htm
but do NOT cheat! :) It's not fun. Would be only waste of time ;-).