It was low-budget movie. I'm sure I watched it on the streaming app Tubi, but it must have been removed because I can't find it in my history.

From what I can remember, the plot is about a group of contestants who sign up for a show where they can win money by facing their fears, but of course the show is a hoax and they end up getting killed by what they fear.

I think the main character is a woman who's afraid of fire... something involving her abusive father?

The only scenes I remember are a scene in which the woman dies at the end (in a fire), a scene in which the serial killer smashes someone's head with a sledgehammer, and another scene where a brother sacrifices himself to save his twin and dies under a circular saw (or something like that).

For as much as I remember about this movie, I can't find anything about it on Google, and the title is so generic that I've had no luck with guessing that either...