The Pedo Handbook is an extensive to guide on pedophilia on the Deep Web, and a website in Welcome to the Game. It is only available after 1:00AM.
Its text has a chance of containing a Red Room key, even without the player needing to click on anything (a key can usually be found next to the word "speech", as shown on the image).
Important: Clicking on "enter" at the bottom of the page results in an immediate Game Over due to the fact it summons the Kidnapper right at the player's shoulder. It can also summon the Breather if he has called the player already. This even applies to Casual Mode.