Some of you might have noticed the "security code" at the end of co-op chapter 4.
GLaDOS:
In just a moment, the word 'blah' will be repeated over and over again.
If at some point you hear a number rather than the word 'blah', ignore it, it is not important.
GLaDOS:
blah blah blah blah blah blah
Announcer:
Today's Security Code is: 5,33,41,18
So if GLaDOS say it is not important... I think it is important!
- Does this security code have a meaning?
- What is this security code for?
I hope it could be some type of easteregg/hidden content.
Regards
PortalCombat

