P.T. (acronym for “playable teaser”) is a psychological horror game developed by Kojima Productions, under the pseudonym “7780s Studio”, and published by Konami. It was directed and designed by Hideo Kojima, in collaboration with filmmaker Guillermo del Toro. Released for the PlayStation 4 on August 12, 2014 as a free download on the PlayStation Network, P.T. served as an interactive teaser for the game Silent Hills, an installment in the Silent Hill series. After the cancellation of Silent Hills, Konami removed P.T. from the PlayStation Store and made it impossible to reinstall. Wikipedia
Research exclusive to this game
Kalinowski, Anna Maria. “Silent Halls: PT, Freud, and Psychological Horror.” Press Start 5, no. 1 (2019).
Research that includes this game in its sample
Backe, Hans-Joachim. “The Aesthetics of Non-Euclidean Game Spaces Multistability and Object Permanence in Antichamber and PT.” Game| World| Architectonics (2021): 153.