If you don't know already, the official matrix web site has a link that allows you to input codes to access areas of the site. (It's in the top right hand corner!)

Unfortunately, they don't tell you these codes. But the truth is out! Below are all the known codes, try them out and uncover the hidden areas!

NEO BULLET TIME LOBBY SENTINEL
GEOF MIRRORMIRROR NEBUCHADNEZZAR
SKROCE DARROW WRONG NUMBER
GUNS MORPHEUS TRINITY
DEJA VU SENTINELLARGE800x600 STEAK
CRASH SITE CREDITS AGENTBULLETTIME
CARRIE LAURENCE KEANU
TOKYO OWEN CHRYSALIS
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