“Thank you for checking out the secret pre-release of the Psycho-pedia.
The goal is to have the most knowledgeable fans help in the process of filling up the Psycho-pedia with excellent Psychonauts information and facts before releasing the Psycho-pedia to the rest of the world.”
–Welcome page
"Old Psychopedia" refers to the now deleted original Psychopedia officially ran by Double Fine Productions. It was shut down in December 2008. It had an assortment of concept art, character descriptions, and videos. Most of the site is still accessible through the Internet Archive's Wayback Machine.