Dont play games with me! Just give me the answer..

Identify X !

X was first published in 1948 in the United Kingdom by Anthony Pratt. It concerned a particular Mr. Black who was the owner of a mansion. Its North American version had a different name for the owner (more popular ). A movie dedicated to this game was made in 1985 with the tagline "It is not just a game anymore" making it the first game to inspire a movie.

What is X ?