For those unaware P.T. was a playable teaser for the game "Silent Hills" on PS4, a reboot of the "Silent Hill" series directed by Hideo Kojima and Guillermo del Toro.
It was a very well received horror game that stood on its own despite being a demo. However because Konami is Konami and Konami is the worst (Joke stolen from
this guy) they fired Hideo Kojima, canceled Silent Hills, and pulled P.T. off of the PSN store.
If you didn't download it to your PS4 before it got pulled it's too late now.
However some rather brilliant people on the internet have gone to the trouble of remaking the game from the ground up.
You can download what's considered the best remake
HERE.
Do it as soon as possible. This is a mirror and the original download was taken down by Konami.
The more people download it before Konami pulls some bulls**t, the better.