http://quiz.ngsec.biz:8080/game1/level2/l33t.php

Can somebody please explain this? I read the "useful reading" on the page, asked some friends, but still, I can't figure it out. I've been trying for a couple hours and nothing's working. I'd love to know how to do it, or be pointed in the right direction of how to figure it out.

Thank You

PS
I'd also like to mention that I googled and checked RFC1.1 for information.