Portal Easter Egg
Easter Egg in the Companion Block Level
Entry Location:
In the level in which you have to use the "companion block" (with the hearts on it), one of the walls is sticking out, and behind it is a secret area with writing and posters on the walls. Beneath the photos of people with the block's picture pasted on their heads there is a username and password scribbled on the wall. It reads:
User: cjohnson
Pass: tier3
Go to http://www.aperturelabratories.com/ and type "Login." Then enter the username and password. Once you've done that, you can enter the following commands:
THECAKEISALIE
DIR/CATALOG/DIRECTORY/LIST/LS/CAT
IP
HELP/LIB
LOGOUT/BYE/LOGOFF/VALVE
APPEND/ATTRIB/COPY/FORMAT/ERASE/RENAME
INTERROGATE
TAPEDISK
APPLY/APPLY.EXE