At Gamescom 2014,P.T.was unleashed on the PlayStation Store and billed as a mystery horror game, seemingly developed by a studio that didn’t even really exist. Millions of PS4 users flocked to theP.T.demo, and it quickly became a horror game phenomenon.P.T.has had a profound impact on the horror game genre since its debut, and while it had a tragic fate, its still one of the top horror games released on the PS4.

P.T.stands for “Playable Teaser,” as the game serves as a teaser forHideo Kojima’s canceledSilent Hillsproject.P.T.uses a first-person perspective and has players moving through a creepy hallway. The hallway seems to loop forever, but as players keep passing through it, they will notice strange happenings. This includes ghost jump scares, a radio broadcast that hints at a terrible fate for the player character’s family, and a ringing telephone.

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Figuring outP.T.’s puzzles is quite the challenge, but eventually, players were greeted with a message announcingSilent Hillsand the reveal thatNorman Reeduswas going to play the main character. This generated significant excitement among the horror gaming community, so it’s a shame that the finished product never saw the light of day.

The relationship between Kojima and Konami became strained, and eventuallySilent Hillswas canceled. From there, Konami removedP.T.from the PlayStation Store, so now a PS4 with the game downloaded is worth a significant sum of cash. It’s also been confirmed thatP.T.is not compatible with PS5 systems, so thoseP.T.PS4 systems may be worth even more in the years to come.

Even though Kojima was unable to realize his vision forSilent Hills,P.T.itself has been hugely influential in the horror genre.P.T.directly inspired Bloober Team’sLayers of Fear, which put that studio on the map as one to watch for horror enthusiasts, and it also very clearly inspiredCapcom’sResident Evil 7(and by extension,Resident Evil 8).

P.T.’s removal from the PlayStation Storemakes it especially difficult for some PS4 gamers to play the game if they want to try it, so some may have to settle for fan remakes.P.T.has been created in Media Molecule’sDreams, and there have been a number of otherP.T.fan remakes out there. It’s not quite the same as playing the original, but it’s going to be the best some horror fans can do if they want to playP.T.this Halloween season.