"P.T" was a "Playable Teaser" released on the PS4 and it was designed by Hideo Kojima in collaboration with film director Guillermo Del Toro. It was also meant as a preview of Konami's highly popular "Silent Hills" series.
The teaser later removed from PS Store, but recently someone created the same game on the unreal engine for PC.
"Unreal P.T" is a remake of the original "P.T" game by Radius Gordello, and reshapes textures, models, animation, gameplay, and code from scratch. It took nine months to make.
If you didn't play the original "P.T" or you want to play it again, now you can.