Yeah it does look interesting, it's on my backlog too...
Enjoy!

Well, first off, thanks for not doing this on the discussion there. Good call.

You basically got it already, so I'm guessing that maybe you're missing the slash at the end of the url? I usually miss that myself...
You can use the url of the last ">>>" link as a template and replace "12345" with the letters/numbers you found.

Posting this on the discussion would essentially solve the puzzle, and would spoil the fun ;-)

Also, please delete your comment here.
Thanks.