Came across this puzzle site mentioned on a forum at a non photography site
Seems to be a simple plain text site. I say geek because it does seem to have maths/ computer based puzzles.
http://www.relpats-eht.com/
Once you have solved the puzzle you type it in to the address bar in your browser - making the URL longer.
So once you have done page 1 you enter the new URL
http://www.relpats-eht.com/answer/ << which of course is not the answer!
Then the URL gets longer as you progress.
The first page is really difficult (maybe?) and could have you going in circles... but the second one only took me a minute. Now staring blankly at page 3