this house has people in it
This House Has People In It was originally aired on TV, being one of Adult Swim’s videos. In the video we see people getting stuck in walls and floors of the house, but to truly understand the story, the viewers had to decipher codes, enter passwords, and more.
House of Leaves

House of Leaves is a novel by Mark Z. Danielewski and it is infamous for being insanely hard to read. It is supposed to be a paradoxical, impossible experience, with pages seemingly unrelated to each other, text written in all directions, et cetera. But one of the ARG experiences it provides is the sense of community; fans of the book band together to decipher and decode all the hidden messages in the book; although one could argue that it isn’t actually changing the plot.
The Wyoming Incident

The Wyoming Incident is a series of videos, originally depicting a fictional hijacking of a TV station. Many fictional viewers reported nausea, headaches and hallucinations as symptoms of viewing the content. Later on, it was expanded into an ARG, with many different hidden messages leading to websites and forums.
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