During a recent conversation, Parsons told me that one of the most challenging things about bringing Backrooms to the big ...

Backrooms,” a psychological horror flick opening this weekend, is part of a wave of breakout films from fledgling directors who honed their instincts on YouTube.

Having already grossed more than $10 million in previews, “Backrooms,” the latest feature from A24 and the debut directorial effort of 20-year-old Kane Parson, is already posed to be a box office hit.

Now 20, the viral creator Kane Parsons is releasing “Backrooms,” a feature-length expansion of his web series.

Parsons, known online as Kane Pixels, skipped college to make the A24 horror movie out Friday.