Not too sure if this has been posted already as I think the site has been up for a while.
Just got recommended this site from a workmate and its got me hooked.
http://n.nfshost.com/1.html
Basicly the image which appears is a clue to the next page.
So for the 1st page you will see the number 1 so what you do is change the '1' in the address bar to 2.
The 3rd image is easy but after that it slowly starts to get tricky.
I'm currently stuck on the 12th page so to any one who gets further then me please PM some hints