Movie about a guy at a big house whose brain gets fried

This has been killing me trying to find. I remember seeing a movie where this guy in his I believe 20’s goes to this house, I forget if he is there to test this equipment or play a virtual reality style game gimmick but he puts on this headgear. Anyway you go through the whole movie, he believes he had the headgear off, I believe it’s somewhat horror like or at least thrilling? But at the very end, it turns out seconds after they turned the headgear piece on it actually malfunctioned and fried his brain I think. So everything you watched only happened within his mind. Please help!