You played deaththreatball.com, how about a worse one?
http://www.hackerskills.comYou have to view the page source, pick apart images, and come up with the next url (a-la deaththreatball.com).
Some friends and I got to level 19 or so but that was it. This one is hardcore.
Anyone want to try it out (and post your reasoning for each step here)?
And if you know of any other puzzle/breadcrumb sites, post other topics for them!