P.T. was a short demo that Guillermo del Toro and Hideo Kojima made for the Silent Hills games that was ultimately never released -- and a pity too, it even had Junji Ito attached as a contributor at one point. As sad as it was that the game was never made though, Konami even pulled the demo, meaning that the short, repetitive horror experience was lost in time.
That is, until a fan remade it, and they did a pretty solid job. The ghost model isn't quite as high-quality, the animations aren't quite as jittery and weird, but the overall experience is solid and you can enjoy it yourself now.
"P.T. centers on an unnamed protagonist who awakens in a concrete-lined room and opens a door to a haunted corridor, in which he can only walk through a hallway which continuously loops and redecorates itself," the demo's blurb reads. "The first time he passes, a radio reports on a familicide, which was committed by the father and later mentions two other cases exactly like it."
Thanks to @arturlaczkowski I'll finally be able to play through his recreation of Silent Hill's P.T. on the ROE channel! TIME TO GET SPOOKED Download it for yourself, here - https://t.co/Wv9Y2aBRtI
(P.S., you might want want to download this sooner rather than later.) pic.twitter.com/LTWJkrOOh5— Residence of Evil (@ROEnetwork) November 5, 2018
If you want to download the P.T. remake demo, you can grab it from the creator's website. If you'd like to help contribute to his future efforts, he has a Patreon page you can check out too.