For those who really don't like these kind of puzzle games and mind tricks, here's a bit of help:
|spoiler: -First enter user, or login -Enter any username -Enter PORTAL as the password -Type DIR (Not needed but you can see what it does) -Type APPLY -Fill out 50 pages worth of questions :P -Don't bother writing down the UIN code because the numbers and letters keep changing and in the end when it asks you, it won't match no matter what.
Also try to type "THECAKEISALIE" right after logging in and it should give you a weird video feed with some text followed by a page looking like a bill or spreadsheat of some sort.
DO THAT FIRST, Apparently you get the same result and can save a lot of time .
Well, I actually found the source code to the flash file Valve made the website for, and apparently there isn't anything else to be figured out... just that weird video footage if you enter THECAKEISALIE which doesn't even show off anything really. Very confusing, unless Valve plans to add onto it .
Well I was messing around on there today....and I noticed in some questions 1 letter would be white or would be flickering.....I did not have anything to write down the letters with to see if they made a statement but I figured I would go back through later......but I have tried 3 times now and none of the letters turn white or flicker anymore.....