https://www.cnet.com/news/in-netflix-trailer-for-black-mirror-film-a-video-game-warps-reality/

The special could be the highly anticipated choose-your-own-adventure experience hinted at earlier this year.

It's set in 1984. In the trailer, a computer programmer turns an adventure fantasy novel called Bandersnatch into a video game. But in true dark Black Mirror fashion his task turns into a warped nightmare where the lines between reality and fiction blur.