Wanna scratch you head?

Here is a hot online game(well.. dont get any ideas !! :), which was brought to my attention by a good friend and fellow blogger.
http://n.nfshost.com/1.html
Well.. at first it looks silly.. But what you see is th clue to next level...
Hints: After a level, if you think you are stuck, try modiying the URL to get to the next level.. Thats the mantra of this game... There might be visible clues, invisible clues, hidden clues and many more... So nalla Mandai-Odanjax (loose translation for Go bang your head)